CN115403345A - Surface treatment method of gypsum-based self-leveling mortar terrace - Google Patents
Surface treatment method of gypsum-based self-leveling mortar terrace Download PDFInfo
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- CN115403345A CN115403345A CN202211196468.3A CN202211196468A CN115403345A CN 115403345 A CN115403345 A CN 115403345A CN 202211196468 A CN202211196468 A CN 202211196468A CN 115403345 A CN115403345 A CN 115403345A
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- leveling mortar
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/10—Lime cements or magnesium oxide cements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/12—Flooring or floor layers made of masses in situ, e.g. seamless magnesite floors, terrazzo gypsum floors
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/60—Flooring materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Architecture (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a surface treatment method of a gypsum-based self-leveling mortar terrace, which is used for pouring gypsum-based self-leveling mortar as a leveling layer or a paving layer of the terrace and is characterized in that after the gypsum-based self-leveling mortar is poured, a layer of mixture of sulphoaluminate curing agent is coated on the surface of the gypsum-based self-leveling mortar before the gypsum-based self-leveling mortar is initially set and hardened, and the sulphoaluminate curing agent adopts sulphoaluminate cementing material as a bonding material; the sulphoaluminate curing agent is a surface curing material containing sulphoaluminate cement clinker, ash calcium powder, slag powder, waste ceramic powder, quartz sand, polymer latex powder, hydroxypropyl methyl cellulose ether (HPMC), a defoaming agent, a dispersing agent and mixing water. The method is simple and convenient in integral operation and construction, not only improves the wear resistance and compressive strength of the gypsum-based self-leveling mortar terrace, but also effectively solves the problems of water drainage and porosity on the surface of the gypsum-based self-leveling mortar.
Description
Technical Field
The invention relates to the field of building construction based on gypsum-based self-leveling mortar, in particular to a surface treatment method of a gypsum-based self-leveling mortar terrace.
Background
The gypsum-based self-leveling mortar is a green building material prepared by adopting semi-hydrated gypsum or II type anhydrous gypsum as a main cementing material and adding functional components such as fine aggregate, ultrafine mineral admixture, admixture and the like, and is mainly used for a concrete floor pavement layer or a leveling layer and can also be used for a heat-insulating layer of a floor heating.
The building gypsum has high setting and hardening speed and micro-expansion characteristics after hardening, and the gypsum-based self-leveling mortar is used as the terrace, so that the construction speed can be increased, and the problem that the cement-based self-leveling mortar is easy to crack due to large shrinkage can be avoided. The gypsum-based self-leveling mortar has good fluidity, does not need to be maintained after pouring, and can reduce the construction strength and the labor capacity of constructors. The gypsum hardened body contains a large number of micropores, the porosity can reach 60% generally, and the gypsum-based self-leveling mortar floor has good heat preservation, sound insulation and moisture absorption characteristics, so that the gypsum-based self-leveling mortar floor has the advantages of heat preservation, sound insulation, high comfort level and the like, and large-scale application of the gypsum-based self-leveling mortar floor is not only beneficial to improving the comfort level of human living environment, but also beneficial to building energy conservation. In addition, the gypsum-based self-leveling mortar usually adopts building gypsum prepared by taking industrial by-product gypsum as a raw material as a cementing material, and the large-scale application of the gypsum-based self-leveling mortar is also beneficial to improving the resource utilization level and the comprehensive utilization rate of the building material of the industrial by-product gypsum and solving the problem of environmental pollution caused by the large-scale stockpiling of the industrial by-product gypsum.
Due to the fact that the gypsum-based self-leveling mortar has a plurality of technical advantages, the application scale of the gypsum-based self-leveling mortar is rapidly enlarged, but in the popularization and application process of the gypsum-based self-leveling mortar, due to the problems of surface bleeding of the gypsum-based self-leveling mortar, poor wear resistance of a gypsum hardening body and the like, the gypsum-based self-leveling mortar terrace is poor in surface air hole multiple wear resistance and the like, the application effect of the gypsum-based self-leveling mortar is remarkably reduced, and the engineering application of the gypsum-based self-leveling mortar is greatly limited.
The construction process of the gypsum-based self-leveling mortar mainly comprises the following steps: cleaning and processing a base layer, brushing an interface agent, pouring construction of self-leveling mortar, surface treatment and maintenance and the like. In order to ensure the construction performance of the gypsum-based self-leveling mortar, the water-cement ratio of the gypsum-based self-leveling mortar is usually higher, so that a large number of bubbles and surface bleeding phenomena are easy to appear on the surface of the gypsum-based self-leveling mortar after the gypsum-based self-leveling mortar is poured, and if the gypsum-based self-leveling mortar is not properly treated, the compressive strength of the surface layer of the gypsum-based self-leveling mortar is obviously reduced, watermarks and a large number of air holes appear, and even cracking phenomena appear. Meanwhile, the surface strength of the gypsum-based self-leveling mortar is reduced, so that the pulverization phenomenon can occur on the surface of the terrace, and the surface quality and the later-stage application effect of the gypsum-based self-leveling mortar terrace are seriously influenced.
In order to improve the surface quality of the gypsum-based self-leveling mortar terrace, after the gypsum-based self-leveling mortar is poured, construction personnel usually adopt a water-absorbing cotton roller soaked with a defoaming agent solution to roll on the surface of the gypsum-based self-leveling mortar which is not condensed and hardened, so as to absorb free water secreted by the surface and eliminate air holes on the surface, so that the surface quality of the gypsum-based self-leveling mortar terrace is improved. And a defoaming agent solution can be directly sprayed on the surface of the gypsum-based self-leveling mortar which is not solidified and hardened by adopting a defoaming agent spraying mode so as to eliminate air holes on the surface of the floor. By adopting the mode, the surface bleeding and air holes of the gypsum-based self-leveling mortar terrace can be reduced to a certain extent, but the hardness of dihydrate gypsum of a building gypsum hardening body is lower, and the Mohs hardness of the dihydrate gypsum is only 2, so that even if the surface treatment method is adopted, the hardness of dihydrate gypsum is lower, the wear resistance is poorer, and the surface hardness of the gypsum-based self-leveling mortar terrace is difficult to improve substantially.
In order to improve the surface hardness and the wear resistance of the gypsum-based self-leveling mortar terrace, researchers cast a layer of terrace material with higher strength and wear resistance on the surface of the gypsum-based self-leveling mortar terrace. For example, magnesium phosphate cement mortar can be poured on the surface of the gypsum-based self-leveling mortar terrace, and the characteristics of high setting and hardening speed, high early strength and good wear resistance of the magnesium phosphate cement mortar are utilized to form the composite terrace of the gypsum-based self-leveling mortar terrace and the magnesium phosphate cement mortar, so that the aims of improving the surface quality and the wear resistance of the terrace are fulfilled. Researchers also pour epoxy resin floor materials on the surfaces of the gypsum-based self-leveling mortar to form gypsum-based self-leveling mortar and epoxy resin floor material composite floors.
However, the adoption of the treatment method not only causes the construction efficiency of the gypsum-based self-leveling mortar terrace to be obviously reduced, but also causes the construction cost of the gypsum-based self-leveling mortar terrace to be sharply increased. In addition, because the water consumption of the gypsum-based self-leveling mortar is large and remarkably exceeds the hydration theoretical water demand of the building gypsum, a large amount of free water exists in a gypsum-based self-leveling mortar hardened body, and if the free water content is high, the free water is evaporated to cause hollowing or cracking of a magnesium phosphate cement mortar or epoxy resin floor poured on the upper layer of the floor. If waiting for gypsum base self-leveling mortar terrace free water complete evaporation to finish, the terrace reaches the air-dry state, can lead to gypsum base self-leveling mortar terrace's efficiency of construction to show to reduce again.
In conclusion, how to provide a treatment method which can not only improve the surface hardness and the wear resistance of the gypsum-based self-leveling mortar terrace, but also better eliminate the phenomena of surface pores and hollowing cracking of the gypsum-based self-leveling mortar terrace becomes a difficult problem to be considered and solved by technical personnel in the field.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: the surface treatment method of the gypsum-based self-leveling mortar terrace has the advantages that the surface hardness and the wear resistance of the terrace after treatment are better, the phenomena of surface pores and hollowing and cracking of the gypsum-based self-leveling mortar terrace can be better eliminated, and the surface quality of the terrace is improved.
In order to solve the technical problems, the invention adopts the following technical scheme:
a surface treatment method of gypsum-based self-leveling mortar terrace, pour gypsum-based self-leveling mortar as the leveling course or pavement layer of the terrace, characterized by, after pouring gypsum-based self-leveling mortar, before gypsum-based self-leveling mortar sets and hardens initially, coat a layer of mixture of sulphoaluminate curing agent on its surface, the said sulphoaluminate curing agent adopts sulphoaluminate gelled material as the adhesive material; the sulphoaluminate curing agent is a surface curing material containing sulphoaluminate cement clinker, ash calcium powder, slag powder, waste ceramic powder, quartz sand, polymer latex powder, hydroxypropyl methyl cellulose ether (HPMC), a defoaming agent, a dispersing agent and mixing water.
In the scheme, the gypsum-based self-leveling mortar floor is a cast-in-place building gypsum-based self-leveling mortar floor, an anhydrite-based self-leveling mortar floor or a building gypsum and anhydrite composite self-leveling mortar floor. The surface refers to a surface which is not completely hardened and formed after gypsum-based self-leveling mortar is poured. The sulphoaluminate curing agent is a surface curing material containing sulphoaluminate cement clinker, ash calcium powder, slag powder, waste ceramic powder, quartz sand, polymer latex powder, HPMC (hydroxy propyl methyl cellulose), a defoaming agent, a dispersing agent and mixing water, and can form a high-strength and high-hardness terrace surface based on the rapid setting and hardening of the sulphoaluminate cement clinker, the ash calcium powder and dihydrate gypsum.
By adopting the scheme, after the gypsum-based self-leveling mortar is poured, a layer of sulphoaluminate cement clinker bonding material with specific components is sprayed as a curing agent, and the sulphoaluminate cement clinker and C are used as the curing agent 12 A 7 The quick setting and hardening reaction between the mortar and the dihydrate gypsum to ensure that the gypsum-based self-leveling mortarThe surface of the terrace is rapidly solidified, so that the surface compressive strength and hardness of the gypsum-based self-leveling mortar terrace are improved. Meanwhile, the interface agent material contains wear-resistant components such as waste ceramic powder, quartz sand and the like, so that the hardness of the surface of the gypsum-based self-leveling mortar terrace can be obviously improved, and the aim of improving the wear resistance of the surface of the gypsum-based self-leveling mortar terrace is fulfilled. Because the curing agent is firmly bonded and consolidated with the gypsum-based self-leveling mortar into a whole in the process of setting and hardening, the bonding strength and integrity between the gypsum-based self-leveling mortar terrace and the curing agent are greatly improved, and interlayer peeling or hollowing between the sealing layer and the gypsum-based self-leveling mortar terrace is prevented. Meanwhile, the slag powder is doped in the curing agent, and the slag powder can form a waterproof solid sealing layer on the surface of the gypsum-based self-leveling mortar after being continuously hydrated under the alkaline condition, so that the water resistance and the moisture resistance of the gypsum-based self-leveling mortar terrace are improved. Meanwhile, the continuous reaction of the dihydrate gypsum and the sulphoaluminate cement clinker can also improve the early strength of the sealing layer, avoid delaying the subsequent procedures caused by the lower early strength of the gypsum-based self-leveling mortar terrace, effectively solve the problems of low compressive strength, poor wear resistance and poor water resistance of the surface layer of the gypsum-based self-leveling mortar terrace, obviously improve the construction efficiency of the gypsum-based self-leveling mortar, and prevent the gypsum-based self-leveling mortar terrace from having common quality problems such as cracking.
Preferably, the sulphoaluminate cement clinker is anhydrous calcium sulphoaluminate and dicalcium silicate (2 CaO. SiO) obtained by using bauxite, limestone and the like as raw materials and calcining the raw materials to be completely or partially melted 2 ) And calcium aluminoferrite as the main mineral component.
Further, in the sulphoaluminate cement clinker curing agent, the sulphoaluminate cement clinker, the ash calcium powder, the slag powder, the waste ceramic powder, the quartz sand, the polymer latex powder, the hydroxypropyl methyl cellulose ether, the defoaming agent and the water are mixed according to the mass part ratio range, wherein the sulphoaluminate cement clinker comprises (10) - (25) parts of the ash calcium powder (3) - (5): slag powder (10 to 15) portions: 25-40 parts of waste ceramic powder: quartz sand (30 to 45) portions: polymer latex powder (0.1 to 0.5): hydroxypropyl methylcellulose ether (0.01 to 0.05) parts: defoaming agent (0.01 to 0.05) portion: 0.1 to 0.3 portion of dispersant and 20 to 30 portions of curing agent are mixed with water to satisfy the wetting of the dry mixture. Because the bleeding phenomenon often appears on the surface of the gypsum-based self-leveling mortar, the curing agent only needs to be added with a small amount of mixing water, even without being added with the mixing water, and the bleeding on the surface of the gypsum-based self-leveling mortar is fully utilized to meet the requirement of the hydration water consumption of the curing agent. In the composition materials, the mass sum of the sulphoaluminate cement clinker, the ash calcium powder, the slag powder, the waste ceramic powder and the quartz sand is 100, and the mixing proportion of the other materials is the ratio of the material to the mass sum of the 5 materials.
In the implementation, in the range of the mixture ratio, the specific mass ratio of the sulphoaluminate cement clinker, the ash calcium powder, the slag powder, the waste ceramic powder, the quartz sand, the polymer latex powder, the hydroxypropyl methyl cellulose ether, the defoaming agent and the dispersing agent can be adjusted according to the compressive strength, the setting time and the bleeding rate of the gypsum-based self-leveling mortar terrace, and a more excellent specific mixture ratio can be selected in a specific test on the consolidation effect.
When the sulphoaluminate cement clinker curing agent is used, the sulphoaluminate cement clinker can rapidly generate strength based on the reaction between a calcium aluminate mineral and dihydrate gypsum (a hydration product of gypsum-based self-leveling mortar), and the 1d compressive strength of the sulphoaluminate cement clinker curing agent can exceed 20MPa. The curing agent has higher early strength, and can obviously improve the surface layer compressive strength and the wear resistance of the gypsum-based self-leveling mortar terrace, thereby obviously improving the application effect of the gypsum-based self-leveling mortar terrace and avoiding the phenomena of hollowing, cracking and chalking of the gypsum-based self-leveling mortar terrace.
The sierozem powder in the curing agent can play a role in adjusting the setting time and the early strength of the curing agent. The method has the advantages that the condensation hardening time of the curing agent is adjusted by utilizing the principle that a large amount of calcium hydroxide is generated after the contact of the ash calcium and the water, so that the curing time of the curing agent is matched with the final setting time of the gypsum-based self-leveling mortar, and the phenomena that the curing layer is completely condensed and hardened and has high strength, but the gypsum-based self-leveling mortar is not finally set and has no strength are avoided.
Slag powder in the curing agent can participate in the hydration reaction of the curing agent, the hydration reaction degree of the curing agent is improved, and meanwhile, the compressive strength and the water resistance of the curing layer can also be improved, so that the water resistance and the moisture resistance of the gypsum-based self-leveling mortar terrace are obviously improved, and the mechanical property of the gypsum-based self-leveling mortar terrace is prevented from being gradually deteriorated in a humid environment.
The waste ceramic powder and the quartz sand in the curing agent mainly play a role in improving the strength and the wear resistance of the cured layer; in the curing agent spraying process, the quartz sand with large particles and the waste ceramic powder with good wear resistance can obviously improve the wear resistance of the cured layer, simultaneously improve the compressive strength of the cured layer and reduce the drying shrinkage of the cured layer, so that the gypsum-based self-leveling mortar terrace has good wear resistance and crack resistance.
The polymer latex powder in the curing agent mainly plays a role in improving the bonding strength of the curing agent and the gypsum-based self-leveling mortar terrace, so that the curing layer is better firmly combined with the gypsum-based self-leveling mortar terrace to form a good whole. The hydroxypropyl methyl cellulose ether mainly plays roles in thickening and tackifying, prevents the curing agent from layering and segregation when the gypsum-based self-leveling mortar bleeds, avoids the phenomenon of flowing of the curing agent in the spraying process, and simultaneously ensures the uniformity of the curing agent when meeting water after being sprayed. The defoaming agent has the effects of eliminating bubbles generated when the curing agent meets water, improving the strength and compactness of the cured layer and obviously eliminating pores on the surface of the gypsum-based self-leveling mortar terrace, thereby improving the apparent quality of the gypsum-based self-leveling mortar terrace. The dispersant has the function of avoiding the agglomeration phenomenon of the curing agent powder after meeting water, which leads to the reduction of the uniformity of the cured layer.
Therefore, the sulphoaluminate cement clinker curing agent prepared according to the proportion has the characteristics of simple components, easiness in preparation, high strength of the cured layer, good wear resistance, higher early strength and good crack resistance. The gypsum-based self-leveling mortar terrace has the advantages that the problems of bleeding and surface layer powdering of the gypsum-based self-leveling mortar can be effectively solved, the compressive strength, the wear resistance and the water resistance of the gypsum-based self-leveling mortar terrace can be obviously improved, and meanwhile, the surface of the gypsum-based self-leveling mortar terrace can be prevented from cracking, so that the long-term service performance of the gypsum-based self-leveling mortar terrace is obviously improved, and the gypsum-based self-leveling mortar terrace is very suitable for rapid surface treatment of the gypsum-based self-leveling mortar terrace.
Preferably, among the above materials, the sulphoaluminate cement clinker Al 2 O 3 The content is not less than 24 percent, the residue of a sieve with the size of 45 mu m is not more than 25 percent, and the 3d compressive strength is not less than 45.0 MPa. The sulphoaluminate cement clinker can react with the dihydrate gypsum and the slag to react rapidly, thereby ensuring the curing effect of the curing agent.
Further, the main component of the sierozem powder in the curing agent is Ca (OH) 2 CaO and a small amount of CaCO 3 The mixture of (2) is a finished product of lime, wherein the content of CaO and MgO in the lime powder is not less than 60%, and the fineness is more than 325 meshes. The sierozem powder can play a role in adjusting the setting time and the early strength of the curing agent. The method has the advantages that the condensation hardening time of the curing agent is adjusted by utilizing the principle that a large amount of calcium hydroxide is generated after the contact of the ash calcium and the water, so that the curing time of the curing agent is matched with the final setting time of the gypsum-based self-leveling mortar, and the phenomena that the curing layer is completely condensed and hardened and has high strength, but the gypsum-based self-leveling mortar is not finally set and has no strength are avoided.
Further, the slag powder in the curing agent is powder with certain fineness prepared by taking granulated blast furnace slag (slag powder for short) as a main raw material and mixing a small amount of gypsum and grinding, and the specific surface area of the slag powder is not less than 300 m 2 And/kg, the grade is not lower than S75 grade. By utilizing the characteristic of high hydration activity of the slag powder, the slag powder is hydrated to generate hydrated calcium carbonate in an alkaline environment, so that the water resistance of a cured layer can be obviously improved, and the water resistance and the moisture resistance of the gypsum-based self-leveling mortar terrace are improved.
Further, the waste ceramic powder in the curing agent refers to ceramic waste generated in the ceramic production process, and can also be recycled ceramic, and the waste ceramic powder is prepared by grinding, is a silicon-aluminum material, has good wear resistance and high temperature resistance, and has an average particle size of 200 meshes. The waste ceramic powder is added into the curing agent, so that the wear resistance of the solid sealing layer can be obviously improved, and the solid sealing layer has higher glossiness.
Furthermore, the quartz sand in the curing agent is SiO 2 The fine aggregate is mainly composed of 0.6 to 1.18 mm in particle size. The curing agent is doped with the quartz sand, so that the drying shrinkage and the preparation cost of the solid seal layer can be reduced, and the compressive strength and the wear resistance of the solid seal layer can be improved, so that the compressive strength and the wear resistance of the gypsum-based self-leveling mortar terrace are obviously improved.
Furthermore, the polymer latex powder in the curing agent adopts vinyl acetate-ethylene copolymer. The vinyl acetate-ethylene copolymer ensures that the mixture has good cohesiveness, can obviously improve the interface bonding strength of the curing agent and the gypsum-based self-leveling mortar base layer, and can also improve the cohesiveness and the consistency of the curing agent.
Further, the hydroxypropyl methyl cellulose ether in the curing agent has a viscosity unit of 10000 to 50000 mPas. The function of adjusting the consistency of the curing agent can be better realized.
Further, the defoaming agent in the curing agent mainly adopts tributyl phosphate and/or polydimethylsiloxane. The method has the effects of eliminating bubbles on the surface of the gypsum-based self-leveling mortar, avoiding bubbles generated after a curing agent meets water, and achieving the purposes of quickly eliminating bubbles in the gypsum-based self-leveling mortar and inhibiting bubbles generated after a curing agent mixture meets water.
Further, the dispersant in the curing agent is mainly polycarboxylate or sulfamate. The function is to improve the dispersibility of the powder in the curing agent and ensure that the curing agent can be more uniformly distributed after meeting water.
Further, the using method and the using process of the sulphoaluminate cement clinker curing agent comprise the following steps: a, weighing dry powder raw materials according to the proportion requirement, adding mixing water after the dry powder raw materials are uniformly stirred, and injecting the mixture into a spraying pump bin after the mixture is uniformly stirred; b, spraying the slurry on the gypsum-based self-leveling mortar floor surface which is not solidified and hardened; c, rolling and flattening the curing agent by using a plastic roller; d, after the curing agent is finally solidified, polishing and flattening the surface by using a floor polishing machine.
By adopting the steps, the surface treatment effect of the gypsum-based self-leveling mortar terrace can be better ensured. In each step, the sulphoaluminate cement clinker curing agent is sprayed or coated, so that the compressive strength, the hardness and the wear resistance of the surface layer of the gypsum-based self-leveling mortar can be improved, and the problems of bleeding, many pores and poor wear resistance of the surface of the gypsum-based self-leveling mortar can be solved.
And (b) optimally, when the curing agent raw materials are mixed in the step (a), firstly, adding dry powder raw materials except water in the curing agent raw materials into a mortar stirrer to stir at a slow speed (the stirring time of the slow stirrer can be 60 to 90 seconds, the rotating speed of the stirrer is more than 60 r/min, and the output power is 3 kW), adding the mixing water with a corresponding proportion to stir uniformly, and continuously stirring uniformly (the stirring time of the slow stirrer can be 120 to 180 seconds) to obtain a mixture. The mixture of the sulphoaluminate cement clinker interface agent is prepared on the construction site, the dry powder is firstly mixed uniformly, and then the mixture is added with mixing water, so that the hydration reaction is prevented from generating too early, and the preparation method is convenient and quick and is beneficial to construction.
In the step a, the mixing time of the dry powder is not less than 60s, so that the dry mixture is uniformly stirred; b, adding water into the uniformly stirred dry mixture, stirring for 120-180 seconds, pouring into a spraying pump bin, spraying the mixture on the surface of the gypsum-based self-leveling mortar which is not solidified and hardened, spraying once, and performing the step c after 5-10 minutes of spraying is finished; and d is carried out after 3 hours after the step c is finished.
In the step c, a plastic roller can be adopted to slightly roll the curing agent mixture to enable the curing agent mixture to be smooth and improve the compactness of the sealing layer.
And d, polishing and flattening the sealing layer by using a floor polishing machine after the curing agent is finally set, so as to improve the flatness of the floor.
Therefore, the gypsum-based self-leveling mortar terrace with smooth surface, high surface layer compressive strength, good wear resistance and good glossiness can be obtained. Furthermore, the thickness of the solid seal layer of the sulphoaluminate cement clinker curing agent on the surface of the gypsum-based self-leveling mortar terrace is 3.0-5.0 mm, so that the curing effect can be better ensured, and the compressive strength and the wear resistance of the solid seal layer can be improved.
Therefore, the principle of the curing agent is as follows: and b, spraying the uniformly mixed curing agent on the surface of the gypsum-based self-leveling mortar to play a role of rapid curing, so that a sealing layer with higher compressive strength and good wear resistance is formed on the surface of the gypsum-based self-leveling mortar, and a sealing layer with better water resistance is formed on the surface of the gypsum-based self-leveling mortar terrace. And c, rolling the sprayed curing agent mixture by using a plastic roller, wherein the curing agent mixture is more compact, is more closely contacted with the surface of the gypsum-based self-leveling mortar, and better absorbs free water on the surface, simultaneously eliminates bubbles on the surface of the curing agent mixture and the gypsum-based self-leveling mortar by using the defoaming characteristic of a defoaming agent, improves the compactness of the curing agent, and simultaneously forms a polymer film layer with certain bonding property in the solid sealing layer by using the film forming characteristic of the polymer emulsion, so that the interface bonding strength of the solid sealing layer and the gypsum-based self-leveling mortar is improved, and the solid sealing layer and the gypsum-based self-leveling mortar form a good whole. And d, removing floating dust and loosely bonded particles on the surface of the floor by using a floor polisher so as to ensure the flatness and the wear resistance of the gypsum-based self-leveling mortar floor. The invention actually discloses the composition and the use method of the sulphoaluminate cement clinker curing agent for the surface treatment of the gypsum-based self-leveling mortar terrace, the sulphoaluminate cement clinker curing agent for the surface treatment of the gypsum-based self-leveling mortar terrace can greatly improve the comprehensive use performance of the gypsum-based self-leveling mortar terrace, including water resistance, compressive strength, crack resistance, wear resistance and the like, and simultaneously solves the problems of surface bleeding and more air holes of the gypsum-based self-leveling mortar.
After the technical scheme is adopted, the invention has the advantages that: (1) The surface treatment of the gypsum-based self-leveling mortar terrace and the construction process of the gypsum-based self-leveling mortar pavement layer are combined into a whole, so that the construction process is simplified and the construction progress is accelerated; (2) By spraying the curing agent, the compressive strength, the surface wear resistance and the moisture resistance of the surface layer of the gypsum-based self-leveling mortar terrace are obviously improved; (3) The surface curing agent is utilized to effectively solve the problems of surface bleeding and porosity after the gypsum-based self-leveling mortar is poured, simplify the surface treatment process of the gypsum-based self-leveling mortar and obviously improve the surface flatness and the wear resistance of the gypsum-based self-leveling mortar terrace.
The method is simple to operate, the gypsum-based self-leveling mortar surface is treated by the method, the 1d compressive strength of the sulphoaluminate cement clinker curing agent can exceed 10MPa, and the 28d compressive strength can exceed 30MPa, so that the gypsum-based self-leveling mortar terrace is ensured to have good wear resistance and moisture resistance, the problems of easy bleeding and many surface holes after the gypsum-based self-leveling mortar is poured are effectively solved, and the apparent quality of the gypsum-based self-leveling mortar terrace is obviously improved.
In conclusion, the surface treatment is carried out on the gypsum-based self-leveling mortar terrace by adopting the sulphoaluminate cement clinker curing agent, and the compressive strength and the wear resistance of the surface layer of the gypsum-based self-leveling mortar terrace are improved through the rapid hydration of the sulphoaluminate cement clinker, the sierozem powder, the slag powder and the dihydrate gypsum. As the sulphoaluminate cement clinker, the ash calcium powder and the slag in the curing agent generate hydration reaction with the hydration product dihydrate gypsum of the gypsum-based self-leveling mortar, the curing agent can be tightly bonded with the gypsum-based self-leveling mortar, and free water secreted from the surface of the gypsum-based self-leveling mortar can be consumed, so that the surface bleeding problem of the gypsum-based self-leveling mortar is effectively solved. In addition, the calcium ash, the slag powder and the dihydrate gypsum react together to generate hydraulic minerals such as calcium silicate hydrate and the like, so that the gypsum-based self-leveling mortar floor can be remarkably improved, the rapid construction of the gypsum-based self-leveling mortar floor is realized, the water resistance is realized, and the guarantee is provided for the long-term safe use of the gypsum-based self-leveling mortar floor. The invention has simple and convenient operation and construction, and the curing agent and the gypsum-based self-leveling mortar form a well-combined integral terrace, thereby not only improving the wear resistance and the compressive strength of the gypsum-based self-leveling mortar terrace, but also effectively solving the problems of bleeding and porosity on the surface of the gypsum-based self-leveling mortar.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
The specific implementation mode is as follows:
a surface treatment method of gypsum-based self-leveling mortar terrace, pour gypsum-based self-leveling mortar as the leveling course or pavement layer of the terrace, characterized by, after pouring gypsum-based self-leveling mortar, before gypsum-based self-leveling mortar sets and hardens initially, coat a layer of mixture of sulphoaluminate curing agent on its surface, the said sulphoaluminate curing agent adopts sulphoaluminate gelled material as the adhesive material; the sulphoaluminate curing agent is a surface curing material containing sulphoaluminate cement clinker, ash calcium powder, slag powder, waste ceramic powder, quartz sand, polymer latex powder, hydroxypropyl methyl cellulose ether (HPMC), a defoaming agent, a dispersing agent and mixing water.
In the scheme, the gypsum-based self-leveling mortar floor is a cast-in-place building gypsum-based self-leveling mortar floor, an anhydrite-based self-leveling mortar floor or a building gypsum and anhydrite composite self-leveling mortar floor. The surface refers to a surface which is not completely hardened and formed after gypsum-based self-leveling mortar is poured. The sulphoaluminate curing agent is a surface curing material containing sulphoaluminate cement clinker, ash calcium powder, slag powder, waste ceramic powder, quartz sand, polymer latex powder, HPMC (hydroxy propyl methyl cellulose), a defoaming agent, a dispersing agent and mixing water, and can form a high-strength and high-hardness terrace surface based on the rapid setting and hardening of the sulphoaluminate cement clinker, the ash calcium powder and dihydrate gypsum.
By adopting the scheme, a layer of sulphoaluminate cement clinker bonding material with specific components is sprayed as a curing agent after the gypsum-based self-leveling mortar is poured, so that the sulphoaluminate cement clinker, the ash calcium and the slag powder fully react with the hydration product dihydrate gypsum of the gypsum-based self-leveling mortar to form an effective sealing layer, the surface wear resistance, the surface compressive strength and the water resistance of the gypsum-based self-leveling mortar terrace are obviously improved, the long-term service performance of the gypsum-based self-leveling mortar is greatly improved, the problems of bleeding and porosity on the surface of the gypsum-based self-leveling mortar terrace are effectively solved, and the surface treatment process of the gypsum-based self-leveling mortar terrace is simplified.
The gypsum-based self-leveling mortar refers to gypsum-based self-leveling mortar with absolute dry compressive strength not less than 20MPa and absolute dry flexural strength less than 7.5 MPa.
Wherein the sulphoaluminate cement clinker is prepared by calcining bauxite, limestone and the like serving as raw materials to be completely or partially melted to obtain anhydrous calcium sulphoaluminate and dicalcium silicate (2 CaO)·SiO 2 ) And calcium aluminoferrite as the main mineral component.
In the sulphoaluminate cement clinker curing agent, the sulphoaluminate cement clinker, the sierozem powder, the slag powder, the waste ceramic powder, the quartz sand, the polymer latex powder, the hydroxypropyl methyl cellulose ether, the defoamer and the water are in the mass part ratio range of 10 to 25 parts of the sulphoaluminate cement clinker to 3 to 5 parts of the sierozem powder: slag powder (10 to 15) portions: 25-40 parts of waste ceramic powder: quartz sand (30 to 45) portions: polymer latex powder (0.1 to 0.5): hydroxypropyl methylcellulose ether (0.01 to 0.05) parts: defoaming agent (0.01 to 0.05) portion: 0.1 to 0.3 part of dispersant and 20 to 30 parts of curing agent by mixing with water to satisfy the wetting of the dry mixture. Because the bleeding phenomenon often appears on the surface of the gypsum-based self-leveling mortar, the curing agent only needs to be added with a small amount of mixing water, even without being added with the mixing water, and the bleeding on the surface of the gypsum-based self-leveling mortar is fully utilized to meet the requirement of the hydration water consumption of the curing agent. In the composition materials, the mass sum of the sulphoaluminate cement clinker, the ash calcium powder, the slag powder, the waste ceramic powder and the quartz sand is 100, and the mixing proportion of the other materials is the ratio of the material to the mass sum of the 5 materials.
In the implementation, in the range of the mixture ratio, the specific mass ratio of the sulphoaluminate cement clinker, the ash calcium powder, the slag powder, the waste ceramic powder, the quartz sand, the polymer latex powder, the hydroxypropyl methyl cellulose ether, the defoaming agent and the dispersing agent can be adjusted according to the compressive strength, the setting time and the bleeding rate of the gypsum-based self-leveling mortar terrace, and a more excellent specific mixture ratio can be selected in a specific test on the consolidation effect.
The sulphoaluminate cement clinker curing agent adopting the proportion has the characteristics of simple components, easiness in preparation, high strength of the cured layer, good wear resistance, higher early strength and good crack resistance. The gypsum-based self-leveling mortar terrace has the advantages that the problems of bleeding and surface layer powdering of the gypsum-based self-leveling mortar can be effectively solved, the compressive strength, the wear resistance and the water resistance of the gypsum-based self-leveling mortar terrace can be obviously improved, and meanwhile, the surface of the gypsum-based self-leveling mortar terrace can be prevented from cracking, so that the long-term service performance of the gypsum-based self-leveling mortar terrace is obviously improved, and the gypsum-based self-leveling mortar terrace is very suitable for rapid surface treatment of the gypsum-based self-leveling mortar terrace.
In the material proportion, the specific surface area of the sulphoaluminate cement clinker used for preparing the sulphoaluminate cement clinker curing agent is 390 to 410 m 2 /kg，Al 2 O 3 The content is not less than 24 percent, the residue of a 45 mu m sieve is not more than 25 percent, the 3d compressive strength is not less than 30.0MPa, and the 28d compressive strength is not less than 3d compressive strength. The sulphoaluminate cement clinker can react with the dihydrate gypsum and the slag to react rapidly, thereby ensuring the curing effect of the curing agent.
Wherein the main component of the sierozem powder in the curing agent is Ca (OH) 2 CaO and a small amount of CaCO 3 The mixture of (1) is a finished product of lime, wherein the content of CaO and MgO in the lime powder is not less than 60%, and the fineness is more than 325 meshes. The function of the sierozem powder is to provide Ca (OH) for the hydration of the sulphoaluminate cement clinker 2 And the hydration performance and the compressive strength of the composite material are enhanced. Therefore, the curing agent can play a role in adjusting the setting time and the early strength of the curing agent. The method has the advantages that the condensation hardening time of the curing agent is adjusted by utilizing the principle that a large amount of calcium hydroxide is generated after the contact of the ash calcium and the water, so that the curing time of the curing agent is matched with the final setting time of the gypsum-based self-leveling mortar, and the phenomena that the curing layer is completely condensed and hardened and has high strength, but the gypsum-based self-leveling mortar is not finally set and has no strength are avoided.
Wherein, the slag powder in the curing agent is powder with certain fineness prepared by taking granulated blast furnace slag (slag powder for short) as a main raw material and adding a small amount of gypsum and grinding, and the specific surface area of the slag powder is not less than 300 m 2 And/kg, the grade is not lower than S75 grade. By utilizing the characteristic of high hydration activity of the slag powder, the slag powder is hydrated to generate hydrated calcium carbonate in an alkaline environment, so that the water resistance of a cured layer can be obviously improved, and the water resistance, compressive strength and moisture resistance of the gypsum-based self-leveling mortar terrace are improved.
The waste ceramic powder in the curing agent refers to ceramic waste generated in the ceramic production process, and can also be recycled ceramic, and is prepared into ceramic powder after grinding, the ceramic powder is a silicon-aluminum material, has good wear resistance and high temperature resistance, and the average particle size of the waste ceramic powder is 200 meshes or preferably not more than 75 microns. The waste ceramic powder is added into the curing agent, so that the wear resistance of the solid sealing layer can be obviously improved, and the solid sealing layer has higher glossiness.
Wherein the quartz sand in the curing agent is SiO 2 The fine aggregate is mainly composed of 0.6 to 1.18 mm in particle size. The curing agent is doped with the quartz sand, so that the drying shrinkage and the preparation cost of the solid seal layer can be reduced, and the compressive strength and the wear resistance of the solid seal layer can be improved, so that the compressive strength and the wear resistance of the gypsum-based self-leveling mortar terrace are obviously improved.
Wherein, the polymer latex powder in the curing agent adopts vinyl acetate-ethylene copolymer. The solid content is not less than 98 percent, and the pH value is 6 to 8. The vinyl acetate-ethylene copolymer ensures that the mixture has good cohesiveness, can obviously improve the interface bonding strength of the curing agent and the gypsum-based self-leveling mortar base layer, and can also improve the cohesiveness and consistency of the curing agent.
Wherein the viscosity unit of the hydroxypropyl methyl cellulose ether in the curing agent is 10000 to 50000 mPas. The function of adjusting the consistency of the curing agent can be better realized. The consistency and the fluidity of the interface agent are better adjusted.
Wherein, the defoaming agent in the curing agent mainly adopts tributyl phosphate and/or polydimethylsiloxane. The method has the effects of eliminating bubbles on the surface of the gypsum-based self-leveling mortar, avoiding bubbles generated after a curing agent meets water, and achieving the purposes of quickly eliminating bubbles in the gypsum-based self-leveling mortar and inhibiting bubbles generated after a curing agent mixture meets water.
Wherein, the dispersant in the curing agent mainly adopts powdery polycarboxylate or sulfamate. The function is to improve the dispersibility of the powder in the curing agent and ensure that the curing agent can be more uniformly distributed after meeting water.
When in implementation, the using method and the process of the sulphoaluminate cement clinker curing agent comprise the following steps: a, weighing dry powder raw materials according to the proportion requirement, adding mixing water after the dry powder raw materials are uniformly stirred, and injecting the mixture into a spraying pump bin after the mixture is uniformly stirred; b, spraying the slurry on the surface of the gypsum-based self-leveling mortar floor which is not solidified and hardened; c, rolling and flattening the curing agent by using a plastic roller; d, after the curing agent is finally set, polishing and flattening the surface by using a floor polishing machine.
By adopting the steps, the surface treatment effect of the gypsum-based self-leveling mortar terrace can be better ensured. In each step, the sulphoaluminate cement clinker curing agent is sprayed or brushed, so that the compressive strength, hardness and wear resistance of the surface layer of the gypsum-based self-leveling mortar can be improved, and the problems of bleeding, more pores and poor wear resistance of the surface of the gypsum-based self-leveling mortar can be solved.
When the curing agent raw materials are mixed in the step a, firstly, adding dry powder raw materials except water in the curing agent raw materials into a mortar stirrer to stir at a slow speed (specifically, stirring time is 60 to 90 seconds by using the slow stirrer, the rotating speed of the stirrer is more than 60 r/min, and output power is 3 kW), adding mixing water with a corresponding proportion to stir uniformly, and continuing to stir uniformly (specifically, stirring time is 120 to 180 seconds by using the slow stirrer), so as to obtain a mixture. The mixture of the sulphoaluminate cement clinker interface agent is prepared on the construction site, the dry powder is firstly mixed uniformly, and then the mixture is added with mixing water, so that the hydration reaction is prevented from generating too early, and the preparation method is convenient and quick and is beneficial to construction.
In the step b, adding water into the uniformly stirred dry mixture, uniformly stirring, then pouring the mixture into a spraying pump bin, spraying the mixture on the surface of the gypsum-based self-leveling mortar which is not solidified and hardened, and spraying for one time, wherein the step c is carried out after the spraying is finished for 5 to 10 minutes; and d is carried out after 3 hours after the step c is finished. And c, slightly rolling the curing agent mixture by using a plastic roller to flatten the curing agent mixture and improve the compactness of the sealing layer. And d, after the curing agent is finally set, polishing and flattening the sealing layer by using a floor polishing machine, and improving the flatness of the floor.
Therefore, the treatment effect can be better ensured by adopting the steps. In each step, the sulphoaluminate cement clinker curing agent is sprayed, so that the surface compressive strength and the surface wear resistance of the gypsum-based self-leveling mortar terrace can be improved, the water resistance and the moisture resistance of the gypsum-based self-leveling mortar terrace can also be improved, meanwhile, the surface treatment process of the gypsum-based self-leveling mortar terrace is optimized, and the quality problems of surface bleeding, high porosity, cracking and the like of the gypsum-based self-leveling mortar are effectively solved. When the method is implemented, the thickness of the sealing layer of the sulphoaluminate cement clinker curing agent on the surface of the gypsum-based self-leveling mortar terrace is 3.0-5.0 mm, so that the curing effect can be better ensured, and the compressive strength and the wear resistance of the sealing layer can be improved.
Next, based on the embodiments disclosed in the above embodiments, the applicant selected gypsum-based self-leveling mortar of class D20 as the subject to be tested, adjusted the compounding parameters of the sulphoaluminate cement clinker, and performed the following four sets of comparative tests. The absolute dry compressive strength value of the selected gypsum-based self-leveling mortar is not less than 20MPa, which is the strength grade of the gypsum-based self-leveling mortar commonly used at present.
Test example 1, the steps in this test example are the same as in the above embodiment, but the specific parameter values are as follows: the sulphoaluminate cement clinker curing agent in the embodiment adopts the following materials in parts by mass: 10 parts of sulphoaluminate cement clinker, 5 parts of sierozem powder: 15-slag powder: 40 parts of waste ceramic powder: 30 parts of quartz sand: 0.1 part of polymer latex powder (VAE): 0.01 part of hydroxypropyl methyl cellulose ether (HPMC): 0.01 part of tributyl phosphate defoaming agent: 0.1 part of a dispersant: and 20 parts of blending water.
Test example 2, the steps in this test example are the same as those in the above embodiment, but the specific parameter values are as follows: the sulphoaluminate cement clinker curing agent in the embodiment adopts the following materials in parts by mass: 15 parts of sulphoaluminate cement clinker, 4 parts of sierozem powder: 10 powder of slag: 30 parts of waste ceramic powder: 41 parts of quartz sand: 0.2 part of polymer latex powder (VAE): 0.02 part of hydroxypropyl methyl cellulose ether (HPMC): 0.02 part of tributyl phosphate defoaming agent: 0.2 part of a dispersant: and 30 parts of mixing water. 0
In test example 3, the steps in the test example are the same as those in the above embodiment, but the specific parameter values are as follows: the sulphoaluminate cement clinker curing agent in the embodiment adopts the following materials in parts by mass: 20 parts of sulphoaluminate cement clinker, 3 parts of sierozem powder: 10 powder of slag: 25 parts of waste ceramic powder: 42 parts of quartz sand: 0.3 part of polymer latex powder (VAE): 0.03 part of hydroxypropyl methyl cellulose ether (HPMC): 0.03 part of tributyl phosphate defoaming agent: 0.3 part of a dispersant: and 30 parts of mixing water.
Test example 4, the steps in the test example are the same as those in the above embodiment, but the specific parameter values are as follows: the sulphoaluminate cement clinker curing agent in the embodiment adopts the following materials in parts by mass: 25 parts of sulphoaluminate cement clinker, 5 parts of sierozem powder: 10 powder of slag: 25 parts of waste ceramic powder: 35 parts of quartz sand: 0.5 part of polymer latex powder (VAE): 0.05 part of hydroxypropyl methyl cellulose ether (HPMC): 0.05 part of tributyl phosphate defoaming agent: 0.3 part of a dispersant: and 20 parts of blending water.
In the four groups of test examples, the interface bonding strength between the sulphoaluminate cement curing agent and the gypsum-based self-leveling mortar is tested by adopting a positive pull bonding test. And pouring a gypsum-based self-leveling mortar test piece with the thickness of 70 mm multiplied by 20 mm, wherein the strength grade of the gypsum-based self-leveling mortar is D20. Before the gypsum-based self-leveling mortar test piece is initially set, the forming frame is placed above the gypsum-based self-leveling mortar test piece, then a sulphoaluminate cement clinker curing agent with the thickness of 50mm multiplied by 5mm is sprayed, and the surface of the gypsum-based self-leveling mortar test piece is smoothed after the curing agent is sprayed. Forming 10 test pieces in each group, placing the test pieces in a curing box with the temperature of 20 +/-2 ℃ and the relative humidity of 65 +/-5%, and curing to the age of 27d according to JC/T1023-2021 gypsum-based self-leveling mortar; and then placing the test piece in a blast drying oven at 42 +/-2 ℃ to be dried to constant weight, and respectively testing the interface positive tensile bonding strength of the test piece after the surface curing agent is sprayed by adopting a positive tensile bonding test method. The test results of the four test examples are shown in the following table.
In addition, for the four groups of test examples, the applicant again tests the compressive strength of the surface layer of the sulphoaluminate cement clinker curing agent compounded with the gypsum-based self-leveling mortar by using the compressive strength test. Pouring gypsum-based self-leveling mortar test pieces of 40 mm multiplied by 35 mm and 40 mm multiplied by 40 mm, wherein the strength grade of the self-leveling mortar is D20. Before the gypsum-based self-leveling mortar test piece with the size of 40 mm multiplied by 35 mm is initially set, the sulphoaluminate cement clinker curing agent is sprayed on the upper part of the gypsum-based self-leveling mortar test piece, and the surface of the gypsum-based self-leveling mortar test piece is leveled after the curing agent spraying is finished, so that the test piece compounded by the gypsum-based self-leveling mortar with the size of 40 mm multiplied by 40 mm and the curing agent can be prepared, and the gypsum-based self-leveling mortar test piece with the size of 40 mm multiplied by 40 mm. Forming 6 test pieces in each group, placing the test pieces in a curing box with the temperature of 20 +/-2 ℃ and the relative humidity of 65 +/-5%, and curing to the age of 27d according to JC/T1023-2021 gypsum-based self-leveling mortar; then the test piece is placed in a blast drying oven at 42 +/-2 ℃ and dried to constant weight, and the compressive strength of the test piece of the sprayed surface curing agent and the test piece of the non-sprayed surface curing agent are respectively tested by adopting a compressive strength test method. The test results of the four test examples are shown in the following table.
In contrast, when the sulphoaluminate cement clinker curing agent is not sprayed, the 28d absolute dry compressive strength of the gypsum-based self-leveling mortar is 21.5MPa, the compressive strength of the surface layer of the gypsum-based self-leveling mortar is enhanced by adopting the method, the rapid construction of the surface layer treatment of the gypsum-based self-leveling mortar can be realized, the surface layer treatment and the curing reinforcement are combined into a whole, the compressive strength of the gypsum-based self-leveling mortar after the construction is finished can be improved by 20-40%, in addition, the curing agent and the gypsum-based self-leveling mortar have higher interface bonding strength, and the cracking and hollowing between the curing agent and the gypsum-based self-leveling mortar can be avoided. The method disclosed by the invention is used for treating the surface of the gypsum-based self-leveling mortar, the interface bonding strength of the curing agent and the gypsum-based self-leveling mortar is higher, the bonding is firmer, the compressive strength of the surface layer is also obviously improved, the rapid construction of the surface treatment of the gypsum-based self-leveling mortar terrace can be realized, the surface layer of the gypsum-based self-leveling mortar is prevented from cracking and being porous, and the compressive strength, the wear resistance and the water resistance of the surface layer of the gypsum-based self-leveling mortar terrace can be improved.
The gypsum-based self-leveling mortar terrace is simple to operate, the gypsum-based self-leveling mortar surface is treated by adopting the gypsum-based self-leveling mortar terrace surface treatment agent, the 1d compressive strength of the sulphoaluminate cement clinker curing agent can exceed 10MPa, and the 28d compressive strength can exceed 30MPa, so that the gypsum-based self-leveling mortar terrace is ensured to have good wear resistance and moisture resistance, the problems of easy bleeding and many surface holes after the gypsum-based self-leveling mortar is poured are effectively solved, and the apparent quality of the gypsum-based self-leveling mortar terrace is remarkably improved.
Claims (10)
1. A surface treatment method of gypsum-based self-leveling mortar terrace, pour gypsum-based self-leveling mortar as the leveling course or pavement layer of the terrace, characterized by, after pouring gypsum-based self-leveling mortar, before gypsum-based self-leveling mortar sets and hardens initially, coat a layer of mixture of sulphoaluminate curing agent on its surface, the said sulphoaluminate curing agent adopts sulphoaluminate gelled material as the adhesive material; the sulphoaluminate curing agent is a surface curing material containing sulphoaluminate cement clinker, ash calcium powder, slag powder, waste ceramic powder, quartz sand, polymer latex powder, hydroxypropyl methyl cellulose ether, a defoaming agent, a dispersing agent and mixing water.
2. The method for surfacing a gypsum-based self-leveling mortar floor according to claim 1, wherein the sulphoaluminate cement clinker curing agent comprises sulphoaluminate cement clinker, sierozem powder, slag powder, waste ceramic powder, quartz sand, polymer latex powder, hydroxypropyl methyl cellulose ether, defoamer and water in the mass part ratio range of (10 to 25) parts of sulphoaluminate cement clinker to (3 to 5) parts of sierozem powder: slag powder (10 to 15) portions: 25-40 parts of waste ceramic powder: quartz sand (30 to 45) parts: polymer latex powder (0.1 to 0.5): hydroxypropyl methylcellulose ether (0.01 to 0.05) parts: defoaming agent (0.01 to 0.05): 0.1 to 0.3 portion of dispersant and 20 to 30 portions of curing agent are mixed with water to satisfy the wetting of the dry mixture.
3. The method of claim 2, wherein the material is selected from the group consisting of aluminosulfate cement clinker Al 2 O 3 The content is not less than 24 percent, the residue of a 45 mu m sieve is not more than 25 percent, and the 3d compressive strength is not less than 45.0 MPa.
4. As in claimThe surface treatment method of the gypsum-based self-leveling mortar floor according to claim 2, characterized in that the main component of the sierozem powder in the curing agent is Ca (OH) 2 CaO and a small amount of CaCO 3 The mixture of (1) is a finished product of lime, wherein the content of CaO and MgO in the lime powder is not less than 60%, and the fineness is more than 325 meshes.
5. The surface treatment method of the gypsum-based self-leveling mortar terrace as claimed in claim 2, wherein the slag powder in the curing agent is powder with a certain fineness prepared by grinding granulated blast furnace slag as a main raw material and a small amount of gypsum, and the specific surface area of the slag powder is not less than 300 m 2 The grade is not lower than S75 grade/kg.
6. The method for treating the surface of the gypsum-based self-leveling mortar terrace according to claim 2, wherein the waste ceramic powder in the curing agent refers to ceramic waste generated in a ceramic production process or recycled ceramic, and is made into ceramic powder after grinding, wherein the ceramic powder is a silica-alumina material and has an average particle size of 200 meshes.
7. The method for treating the surface of the gypsum-based self-leveling mortar terrace according to claim 2, wherein the quartz sand in the curing agent is SiO 2 Fine aggregate which is the main component and has the grain diameter of 0.6 to 1.18 mm;
the polymer latex powder in the curing agent adopts vinyl acetate-ethylene copolymer;
the viscosity unit of hydroxypropyl methyl cellulose ether in the curing agent is 10000 to 50000 mPas;
the defoaming agent in the curing agent mainly adopts tributyl phosphate and/or polydimethylsiloxane;
the dispersant in the curing agent mainly adopts polycarboxylate or sulfamate.
8. The method for treating the surface of a gypsum-based self-leveling mortar floor according to claim 2, wherein the method for using the sulphoaluminate cement clinker curing agent comprises the following steps: a, weighing dry powder raw materials according to the proportion requirement, adding mixing water after the dry powder raw materials are uniformly stirred, and injecting the mixture into a spraying pump bin after the mixture is uniformly stirred; b, spraying the slurry on the surface of the gypsum-based self-leveling mortar floor which is not solidified and hardened; c, rolling and flattening the curing agent by using a plastic roller; d, after the curing agent is finally solidified, polishing and flattening the surface by using a floor polishing machine.
9. The surface treatment method of the gypsum-based self-leveling mortar terrace according to claim 8, wherein when the curing agent raw materials are mixed in the step a, dry powder raw materials except water in the curing agent raw materials are added into a mortar stirrer to be stirred at a low speed, and after the dry powder raw materials are stirred uniformly, the mixing water with the corresponding proportion is added to be continuously stirred uniformly, so that a mixture is obtained.
10. The method of claim 8, wherein in step a, the dry powder mixing time is not less than 60s; in the step b, adding water into the uniformly stirred dry mixture, stirring for 120-180 seconds, then pouring the mixture into a spray pump bin, spraying the mixture on the surface of the gypsum-based self-leveling mortar which is not solidified and hardened, and spraying once, wherein the step c is carried out after the spraying is finished for 5-10 minutes; and d is carried out after 3 hours after the step c is finished.
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| CN102001852A (en) * | 2010-09-21 | 2011-04-06 | 广东龙湖科技有限公司 | Semiflexible rapid leakstopping mortar with high impermeability |
| CN102826814A (en) * | 2012-09-25 | 2012-12-19 | 湖南交泰建材有限公司 | Cement-based self-leveling mortar |
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| CN106587871A (en) * | 2016-11-03 | 2017-04-26 | 南京工业大学 | Self-leveling mortar terrace material used for under-floor heating facilities |
| CN108358570A (en) * | 2018-03-02 | 2018-08-03 | 同济大学 | A kind of pervious concrete and preparation method thereof prepared with ardealite base hydraulicity composite gel material |
| JP2018123026A (en) * | 2017-01-31 | 2018-08-09 | 太平洋マテリアル株式会社 | Self-leveling mortar |
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| CN112500069A (en) * | 2020-12-04 | 2021-03-16 | 东营斯泰普力地坪材料科技发展有限公司 | Concrete integral terrace composite material and construction method |
| CN114477869A (en) * | 2022-01-27 | 2022-05-13 | 武汉盛大长青建材有限公司 | Thick-layer leveling material and construction method thereof |
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| CN102001852A (en) * | 2010-09-21 | 2011-04-06 | 广东龙湖科技有限公司 | Semiflexible rapid leakstopping mortar with high impermeability |
| CN102826814A (en) * | 2012-09-25 | 2012-12-19 | 湖南交泰建材有限公司 | Cement-based self-leveling mortar |
| CN104529292A (en) * | 2014-12-20 | 2015-04-22 | 魏超产 | Anticorrosive high-hardness mortar and preparation method thereof |
| CN106587871A (en) * | 2016-11-03 | 2017-04-26 | 南京工业大学 | Self-leveling mortar terrace material used for under-floor heating facilities |
| JP2018123026A (en) * | 2017-01-31 | 2018-08-09 | 太平洋マテリアル株式会社 | Self-leveling mortar |
| CN108947433A (en) * | 2017-05-27 | 2018-12-07 | 北新集团建材股份有限公司 | A kind of preparation method of gypsum base gravity flow self-leveling floor material |
| CN108358570A (en) * | 2018-03-02 | 2018-08-03 | 同济大学 | A kind of pervious concrete and preparation method thereof prepared with ardealite base hydraulicity composite gel material |
| CN112500069A (en) * | 2020-12-04 | 2021-03-16 | 东营斯泰普力地坪材料科技发展有限公司 | Concrete integral terrace composite material and construction method |
| CN114477869A (en) * | 2022-01-27 | 2022-05-13 | 武汉盛大长青建材有限公司 | Thick-layer leveling material and construction method thereof |
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