CN112479665A - Gypsum-based floor paving system with heat preservation and heat insulation functions and construction method - Google Patents
Gypsum-based floor paving system with heat preservation and heat insulation functions and construction method Download PDFInfo
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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
- C04B28/14—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 calcium sulfate cements
- C04B28/145—Calcium sulfate hemi-hydrate with a specific crystal form
- C04B28/146—Calcium sulfate hemi-hydrate with a specific crystal form alpha-hemihydrate
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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
- C04B28/14—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 calcium sulfate cements
- C04B28/145—Calcium sulfate hemi-hydrate with a specific crystal form
- C04B28/147—Calcium sulfate hemi-hydrate with a specific crystal form beta-hemihydrate
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
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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
- C04B2111/62—Self-levelling compositions
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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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Crystallography & Structural Chemistry (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 gypsum-based terrace paving system with heat preservation and insulation functions and a construction method. Wherein, the heat preservation and insulation layer is foamed gypsum, and the preparation method mainly comprises the following steps: 1) preparing gypsum slurry; 2) preparing foam; 3) preparing foamed gypsum slurry. The protective layer is gypsum-based self-leveling mortar, and the heat insulation layer is poured after being paved, condensed and hardened. The heat preservation and insulation layer prepared by the invention has the characteristics of light volume weight, heat preservation, heat insulation and sound insulation, the protective layer effectively protects the heat preservation and insulation layer, has the characteristics of smoothness, flatness, high strength and good dimensional stability, and can be directly used for construction such as ceramic tile pasting and floor laying. The whole system effectively saves the cost of raw materials, and is particularly suitable for backfill leveling in indoor decoration.
Description
Technical Field
The invention belongs to the field of indoor terraces, and particularly relates to a gypsum-based terrace paving system with heat preservation and insulation functions and a construction method.
Background
The gypsum has low production energy consumption, can be recycled and has obvious energy-saving effect. Gypsum has many irreplaceable advantages over cement. Compared with cement mortar, the gypsum-based mortar has good dimensional stability and better crack resistance. The gypsum has high setting and hardening speed, and can be normally set and hardened under the condition of low temperature in winter. In addition, the gypsum-based mortar has low density, and the paving area is larger when the gypsum-based mortar has the same mass, so that the cost of raw materials is saved.
In the indoor ground decoration engineering, because and the unevenness of basic unit ground, and be equipped with a large amount of pipelines and circuits, therefore ground backfill makes level is essential link, and backfill material's thickness can reach 3 ~ 5cm usually. When gypsum-based self-leveling mortar is directly used as a leveling layer, the following problems can be caused: (1) when the construction thickness of the self-leveling mortar is higher, the segregation and sedimentation degrees are increased, and the phenomena of ash lifting and sand exposure are easily caused; (2) the raw material cost per unit area may be high.
The density of the foamed gypsum is obviously lower than that of the gypsum-based self-leveling mortar, and the paving thickness of the foamed gypsum with the same mass per unit area is higher, namely, when a room with the same area and the same thickness is paved, less materials are needed. Therefore, the foaming gypsum is used for backfill leveling, and the cost of raw materials can be saved. In addition, the gypsum has high setting and hardening speed, has higher strength after hydration and heat release are finished, and can be used for subsequent construction. However, it is difficult to control the density of the foamed gypsum within a reasonable range, balance the relationship between strength and thermal insulation performance, shorten the construction period, and improve the construction efficiency.
Disclosure of Invention
In order to solve the technical problems, the invention provides a gypsum-based terrace paving system with heat preservation and insulation functions and a construction method, wherein the heat preservation and insulation layer has the characteristics of fast strength development, good fluidity and good heat preservation performance. The protective layer has the characteristics of smooth surface and high hardness.
The system consists of a heat-insulating layer and a protective layer, wherein the heat-insulating layer is foamed gypsum, the protective layer is gypsum-based self-leveling mortar, the heat-insulating layer is poured on a base layer coated with an interface agent, and the protective layer is poured on the surface of the heat-insulating layer after the heat-insulating layer is condensed and hardened.
The preparation method of the heat insulation layer mainly comprises the following steps: 1) the preparation method of the gypsum slurry comprises the following steps of: 900-950 parts of semi-hydrated gypsum, 50-100 parts of cement, 0.5-1.2 parts of retarder, 0.3-0.5 part of cellulose ether, 1-2 parts of water repellent and 600-700 parts of water, and adding water and stirring uniformly; 2) preparing foam, namely pouring 3-5 parts of foaming agent, 1-3 parts of foam stabilizer and 120-160 parts of water into a physical foaming machine to generate uniform and fine foam; 3) and (3) preparing foamed gypsum slurry, namely pouring the foam generated in the step (2) into the slurry in the step (1), and uniformly stirring.
Further, the hemihydrate gypsum is alpha-hemihydrate gypsum or beta-hemihydrate gypsum, and the water consumption for the standard consistency is less than 60%.
Further, the cement is 42.5-grade or 52.5-grade portland cement.
Further, the retarder is a protein gypsum retarder; the cellulose ether is hydroxypropyl methyl cellulose ether, and the viscosity of the cellulose ether is 100000 mPa.s; the water repellent is an organic silicon powder water repellent; the foaming agent is sodium dodecyl sulfate or animal protein foaming agent; the foam stabilizer is calcium stearate.
The foaming gypsum provided by the invention is foamed by a physical foaming machine, so that the quality and the volume of bubbles in each batch are ensured to be the same, and the stability of the bubbles is improved by adding the foam stabilizer. The gypsum is doped with a proper amount of Portland cement, which is beneficial to promoting the strength development of the gypsum and improving the water resistance of the gypsum. The water repellent endows the gypsum with certain water resistance and water repellency, and then when the self-leveling mortar is poured on the surface, the interface agent is not required to be coated, and the moisture can be prevented from being absorbed by the bottom layer.
The protective layer comprises the following raw material components in parts by mass: 400-450 parts of semi-hydrated gypsum, 20-40 parts of cement, 50-100 parts of heavy calcium carbonate, 420-470 parts of water-washed river sand, 1-1.5 parts of water reducing agent, 0.6-1 part of retarder, 0.5-1.0 part of defoaming agent and 0.7-1.0 part of cellulose ether.
Further, the protective layer is poured after the heat preservation and insulation layer is finally solidified for 2 hours.
Further, the hemihydrate gypsum is alpha-hemihydrate gypsum or beta-hemihydrate gypsum, and the water consumption for the standard consistency is less than 60%.
Further, the cement is 42.5-grade or 52.5-grade portland cement.
Furthermore, the mesh number of the heavy calcium carbonate is 400 meshes.
Furthermore, the mesh number of the river sand washed by water is 20-140 meshes.
Further, the water reducing agent is a polycarboxylic acid powder water reducing agent; the retarder is a protein gypsum retarder; the cellulose ether is hydroxypropyl methyl cellulose ether with the viscosity of 400 mPa.s; the defoaming agent is a mineral oil powder defoaming agent.
Further, the mass ratio of the cement-based self-leveling mortar to the water to the raw materials is 0.23-0.26.
The invention has the beneficial effects that:
(1) the heat insulating layer has better fluidity during construction, and can be flattened with slight assistance. The absolute dry density is 700kg/m3The compressive strength after final setting for 2 hours can reach about 1.4MPa, and the absolute dry compressive strength is about 2MPa, so that the bearing requirement of normal walking can be met. The heat preservation performance is good, and the heat conductivity coefficient is about 0.15/W/(m.k). The strength of the gypsum is developed quickly, and after the gypsum is finally set for 2 hours, the gypsum-based self-leveling mortar can be poured on the surface.
(2) The protective layer has good leveling property during construction, the surface is flat and smooth after the protective layer is condensed and hardened, no dust is generated, the strength is high, the 24-hour compressive strength can reach more than 11MPa, and a wood floor or a PVC floor can be paved on the surface.
Detailed Description
In order to more clearly illustrate the technical solution of the present invention, the technical solution of the present invention will be further illustrated with reference to the following specific embodiments:
in a specific embodiment of the invention, a gypsum-based terrace paving system with heat preservation and insulation functions and a construction method are provided. The system consists of a heat-insulating layer and a protective layer, wherein the heat-insulating layer is made of foaming gypsum, and the protective layer is made of gypsum-based self-leveling mortar.
The preparation method of the heat insulation layer mainly comprises the following steps: 1) the preparation method of the gypsum slurry comprises the following steps of: 900-950 parts of semi-hydrated gypsum, 50-100 parts of cement, 0.5-1.2 parts of retarder, 0.3-0.5 part of cellulose ether, 1-2 parts of water repellent and 600-700 parts of water, and adding water and stirring uniformly; 2) preparing foam, namely pouring 3-5 parts of foaming agent, 1-3 parts of foam stabilizer and 120-160 parts of water into a physical foaming machine to generate uniform and fine foam; 3) and (3) preparing foamed gypsum slurry, namely pouring the foam generated in the step (2) into the slurry in the step (1), and uniformly stirring.
The semi-hydrated gypsum is alpha-semi-hydrated gypsum or beta-semi-hydrated gypsum, and the water consumption of the standard consistency is less than 60 percent. Alpha-hemihydrate gypsum has a relatively low standard consistency, typically 40% to 50%, while beta-hemihydrate gypsum has a relatively high standard consistency and large fluctuations, typically 50% to 75%. The lower the water consumption of the gypsum at its standard consistency, i.e., the lower the water demand of the gypsum, the higher its mechanical strength. Preferably, embodiments of the present invention utilize gypsum having less than 60% water at standard consistency.
The cement is 42.5-grade or 52.5-grade portland cement, and a proper amount of portland cement is doped in the gypsum, so that the hydration reaction of the gypsum can be promoted, the development of the strength of the gypsum is facilitated, and the water resistance of the gypsum is also obviously improved. If the cement to gypsum substitution is too high, this can result in insufficient early strength of the composite system. Preferably, the present invention is practiced using Portland cement grade 42.5 or 52.5.
The retarder is a protein gypsum retarder, and compared with an inorganic salt retarder, the protein gypsum retarder has stronger retarding effect, lower mixing amount and smaller side effect on the gypsum strength.
The cellulose ether is hydroxypropyl methyl cellulose ether, the viscosity of the hydroxypropyl methyl cellulose ether is 100000mPa.s, the cellulose ether can provide certain viscosity and water-retaining property for gypsum slurry, the viscosity of the gypsum slurry is too low, introduced bubbles cannot be stable, the viscosity of the slurry is too high, the bubbles are not easy to introduce, and the slurry flowability of the foamed gypsum is reduced. The cellulose ether with viscosity of 100000mPa.s is the most common cellulose ether, the price is lower, the cellulose ether with overhigh viscosity is easy to crust, the construction of gypsum is influenced, and for the cellulose ether with lower viscosity, in order to achieve the same slurry viscosity and water retention property, the addition amount needs to be increased, thus being not beneficial to saving the cost.
The water repellent is an organic silicon water repellent, the water repellent can effectively improve the water resistance and the water repellency of the gypsum and avoid the permeation of water, and the gypsum-based self-leveling mortar can be directly poured on the surface of the foamed gypsum without coating an interface agent, so that the working procedures are saved.
The foaming is physical foaming, and the foaming machine can be used for quantitative foaming, so that the quality stability of the foaming gypsum is improved.
The protective layer comprises the following raw material components in parts by mass: 400-450 parts of semi-hydrated gypsum, 20-40 parts of cement, 50-100 parts of heavy calcium carbonate, 420-470 parts of water-washed river sand, 1-1.5 parts of water reducing agent, 0.6-1 part of retarder, 0.5-1.0 part of defoaming agent and 0.7-1.0 part of cellulose ether.
The semi-hydrated gypsum is alpha-semi-hydrated gypsum or beta-semi-hydrated gypsum, and the water consumption of the standard consistency is less than 60 percent. The amount of water used is limited to its standard consistency, also to ensure that the gypsum used has a sufficiently high strength.
The cement is 42.5-grade or 52.5-grade portland cement, the gypsum is weakly acidic, and the pH value of a system can be increased by doping the cement, so that the water reducing effect of the polycarboxylate water reducer can be fully exerted, and the fluidity of the mortar is improved. And when too much cement is added, the shrinkage of the system is increased.
The mesh number of the washed river sand is 20-140 meshes, the river sand used in the self-leveling mortar is generally 70-140 meshes, and the selected 20-140 mesh continuous graded river sand is relatively thick, so that the water consumption of the self-leveling mortar is reduced, and the strength is improved. However, when the sand is too coarse, the flatness of the surface of the self-leveling mortar is affected, and bleeding and sedimentation are easy to occur. Preferably, 20-140 mesh river sand is adopted in the specific implementation mode of the invention.
The coarse whiting is 400 meshes. Preferably, in the embodiment of the invention, 400-mesh heavy calcium carbonate with the particle size smaller than 20-140 meshes and larger than cement is adopted, so that in the gypsum-based self-leveling mortar, the relationship of the particle size is sand > heavy calcium carbonate > gypsum/cement, a continuous gradation is formed, and the compactness and the workability of the mortar are further improved.
Preferably, the retarder is a 2 gypsum retarder; and/or the cellulose ether is hydroxypropyl methyl cellulose ether with the viscosity of 400 mPa.s; and/or the defoaming agent is a mineral oil powder defoaming agent.
The following examples further illustrate the above embodiments, but do not therefore limit the invention within the scope of the examples described. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions. Reagents, materials and equipment not specifically described are commercially available directly.
Example 1
A gypsum-based terrace paving system with heat preservation and insulation functions and a construction method. The preparation method of the heat insulation layer mainly comprises the following steps: 1) the preparation method of the gypsum slurry comprises the following steps of: 900 parts of beta-semi-hydrated gypsum, 100 parts of 42.5-grade portland cement, 1.2 parts of retarder, 0.3 part of 100000mPa.s cellulose ether, 2 parts of water repellent and 650 parts of water are added with water and stirred uniformly; 2) preparing foam, namely pouring 4 parts of foaming agent, 2 parts of foam stabilizer and 140 parts of water into a physical foaming machine to generate uniform and fine foam; 3) and (3) preparing foamed gypsum slurry, namely pouring the foam generated in the step (2) into the slurry in the step (1), and uniformly stirring. The protective layer comprises the following raw material components in parts by mass: 420 parts of beta-semi-hydrated gypsum, 40 parts of 42.5-grade portland cement, 100 parts of heavy calcium carbonate, 420 parts of washed river sand, 1.3 parts of a water reducing agent, 0.9 part of a retarder, 0.6 part of a defoaming agent and 0.7 part of 400mPa.s cellulose ether. The mass ratio of water to material is 0.25.
Example 2
A gypsum-based terrace paving system with heat preservation and insulation functions and a construction method. The preparation method of the heat insulation layer mainly comprises the following steps: 1) the preparation method of the gypsum slurry comprises the following steps of: 950 parts of beta-semi-hydrated gypsum, 50 parts of 52.5-grade portland cement, 1.1 parts of retarder, 0.3 part of 100000mPa.s cellulose ether, 2 parts of water repellent and 700 parts of water, and adding water and stirring uniformly; 2) preparing foam, namely pouring 3 parts of foaming agent, 1 part of foam stabilizer and 120 parts of water into a physical foaming machine to generate uniform and fine foam; 3) and (3) preparing foamed gypsum slurry, namely pouring the foam generated in the step (2) into the slurry in the step (1), and uniformly stirring. The protective layer comprises the following raw material components in parts by mass: 450 parts of beta-semi-hydrated gypsum, 20 parts of 42.5-grade portland cement, 90 parts of heavy calcium carbonate, 440 parts of washed river sand, 1.3 parts of water reducing agent, 1 part of retarder, 0.8 part of defoaming agent and 0.8 part of 400mPa.s cellulose ether. The mass ratio of water to material is 0.26.
Example 3
A gypsum-based terrace paving system with heat preservation and insulation functions and a construction method. The preparation method of the heat insulation layer mainly comprises the following steps: 1) the preparation method of the gypsum slurry comprises the following steps of: 950 parts of beta-semi-hydrated gypsum, 50 parts of 42.5-grade portland cement, 1 part of retarder, 0.3 part of 100000mPa.s cellulose ether, 2 parts of water repellent and 600 parts of water are added with water and stirred uniformly; 2) preparing foam, namely pouring 5 parts of foaming agent, 3 parts of foam stabilizer and 160 parts of water into a physical foaming machine to generate uniform and fine foam; 3) and (3) preparing foamed gypsum slurry, namely pouring the foam generated in the step (2) into the slurry in the step (1), and uniformly stirring. The protective layer comprises the following raw material components in parts by mass: 450 parts of beta-semi-hydrated gypsum, 30 parts of 42.5-grade portland cement, 50 parts of heavy calcium carbonate, 470 parts of washed river sand, 1.5 parts of a water reducing agent, 1 part of a retarder, 1 part of a defoaming agent and 1 part of 400mPa.s cellulose ether. The mass ratio of water to material is 0.26.
Example 4
A gypsum-based terrace paving system with heat preservation and insulation functions and a construction method. The preparation method of the heat insulation layer mainly comprises the following steps: 1) the preparation method of the gypsum slurry comprises the following steps of: 950 parts of alpha-semi-hydrated gypsum, 50 parts of 42.5-grade portland cement, 0.5 part of retarder, 0.5 part of 100000mPa.s cellulose ether, 1 part of water repellent and 700 parts of water are added with water and stirred uniformly; 2) preparing foam, namely pouring 5 parts of foaming agent, 3 parts of foam stabilizer and 160 parts of water into a physical foaming machine to generate uniform and fine foam; 3) and (3) preparing foamed gypsum slurry, namely pouring the foam generated in the step (2) into the slurry in the step (1), and uniformly stirring. The protective layer comprises the following raw material components in parts by mass: 400 parts of alpha-semi-hydrated gypsum, 30 parts of 42.5-grade portland cement, 100 parts of heavy calcium carbonate, 470 parts of washed river sand, 1 part of water reducing agent, 0.6 part of retarder, 0.5 part of defoaming agent and 1 part of 400mPa.s cellulose ether. The mass ratio of water to material is 0.23.
In the comparative examples 1-4, the performances of the foamed gypsum and the gypsum-based self-leveling mortar are compared, the foamed gypsum test method refers to JG/T266-2011 foam concrete, wherein the extensibility test refers to GB/T17669.4-1999 determination of physical properties of the clean gypsum slurry of building gypsum for the purpose of thickening water consumption test, and the gypsum-based self-leveling mortar test method refers to JC/T1023 and 2007 gypsum-based self-leveling mortar, which are specifically shown in tables 1 and 2:
TABLE 1 foamed Gypsum Performance test results
TABLE 2 Gypsum-based self-leveling mortar Performance test results
As can be seen from tables 1 and 2, the setting time of the foamed gypsum is moderate, after 2 hours of final setting, the foamed gypsum has enough strength, the subsequent construction can be carried out, the construction period can be effectively shortened, and the dry density of the foamed gypsum is 700kg/m3Left and right, and has better heat preservation performance. The gypsum-based self-leveling mortar has good fluidity, the 24-hour flexural strength is more than 3MPa, the compressive strength is more than 11MPa, and the requirements of indoor floor decoration and fitment are completely met.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and simplifications made in the spirit of the present invention are intended to be included in the scope of the present invention.
Claims (12)
1. The gypsum-based terrace paving system with the heat preservation and insulation functions and the construction method are characterized in that the system is composed of a heat preservation and insulation layer and a protective layer, the heat preservation and insulation layer is made of foaming gypsum, the protective layer is made of gypsum-based self-leveling mortar, and the protective layer is poured on the surface of the heat preservation and insulation layer after the heat preservation and insulation layer is condensed and hardened. The preparation method of the heat insulation layer mainly comprises the following steps: 1) the preparation method of the gypsum slurry comprises the following steps of: 900-950 parts of semi-hydrated gypsum, 50-100 parts of cement, 0.5-1.2 parts of retarder, 0.3-0.5 part of cellulose ether, 1-2 parts of water repellent and 600-700 parts of water, and adding water and stirring uniformly; 2) preparing foam, namely pouring 3-5 parts of foaming agent, 1-3 parts of foam stabilizer and 120-160 parts of water into a physical foaming machine to generate uniform and fine foam; 3) and (3) preparing foamed gypsum slurry, namely pouring the foam generated in the step (2) into the slurry in the step (1), and uniformly stirring. The protective layer comprises the following raw material components in parts by mass: 400-450 parts of semi-hydrated gypsum, 20-40 parts of cement, 50-100 parts of heavy calcium carbonate, 420-470 parts of water-washed river sand, 1-1.5 parts of water reducing agent, 0.6-1 part of retarder, 0.5-1.0 part of defoaming agent and 0.7-1.0 part of cellulose ether.
2. The foaming gypsum of claim 1, wherein the preparation method mainly comprises the following steps:
(1) preparing gypsum slurry, namely uniformly mixing raw materials such as semi-hydrated gypsum, cement, a retarder, cellulose ether, a water repellent and the like, adding water and uniformly stirring;
(2) preparing foam, namely pouring a foaming agent, a foam stabilizer and water into a physical foaming machine to generate uniform and fine foam;
(3) and (3) preparing foamed gypsum slurry, namely pouring the foam generated in the step (2) into the slurry in the step (1), and uniformly stirring.
3. The foamed gypsum of claim 1, wherein the hemihydrate gypsum is alpha-hemihydrate gypsum or beta-hemihydrate gypsum and the water usage at standard consistency is less than 60%.
4. The foamed gypsum of claim 1, wherein said cement is a 42.5 grade or 52.5 grade portland cement.
5. The foamed gypsum of claim 1, wherein said set retarder is a protein gypsum set retarder; the cellulose ether is hydroxypropyl methyl cellulose ether, and the viscosity of the cellulose ether is 100000 mPa.s; the water repellent is an organic silicon powder water repellent; the foaming agent is sodium dodecyl sulfate or animal protein foaming agent; the foam stabilizer is calcium stearate.
6. The gypsum-based self-leveling mortar according to claim 1, wherein the mortar is poured after the insulation layer sets for 2 hours.
7. The gypsum-based self-leveling mortar of claim 1, wherein the hemihydrate gypsum is alpha-hemihydrate gypsum or beta-hemihydrate gypsum and the water usage at standard consistency is less than 60%.
8. The gypsum-based self-leveling mortar of claim 1, wherein the cement is a 42.5 grade or 52.5 grade portland cement.
9. The gypsum-based self-leveling mortar of claim 1, wherein the heavy calcium carbonate has a mesh size of 400 mesh.
10. The gypsum-based self-leveling mortar according to claim 1, wherein the mesh number of the washed river sand is 20-140 meshes.
11. The gypsum-based self-leveling mortar of claim 1, wherein the water reducer is a polycarboxylic acid powder water reducer; the retarder is a protein gypsum retarder; the cellulose ether is hydroxypropyl methyl cellulose ether, and the viscosity of the cellulose ether is 400 mPa.s; the defoaming agent is a mineral oil powder defoaming agent.
12. The cement-based self-leveling mortar according to claim 1, wherein the mass ratio of water to the raw material is 0.23 to 0.26.
Priority Applications (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116693321A (en) * | 2023-04-13 | 2023-09-05 | 重庆交通大学 | Preparation method of modified phosphogypsum-based self-leveling mortar |
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| CN102452826A (en) * | 2010-10-19 | 2012-05-16 | 上海城建物资有限公司 | Low-carbon self-leveling ground leveling gypsum formula |
| CN107619245A (en) * | 2017-10-19 | 2018-01-23 | 宝辰永宇（滁州）新材料科技有限公司 | A kind of surfacing self-leveling floor mortar and its construction method |
| CN108516785A (en) * | 2018-07-03 | 2018-09-11 | 义乌市恒起进出口有限公司 | A kind of high-early-strength does not crack surfacing self-leveling floor mortar and preparation method thereof |
| CN208844862U (en) * | 2018-08-20 | 2019-05-10 | 上海境锐建筑科技有限公司 | Light thermal-insulation gravity flow self-leveling floor |
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| CN102452826A (en) * | 2010-10-19 | 2012-05-16 | 上海城建物资有限公司 | Low-carbon self-leveling ground leveling gypsum formula |
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| CN116693321A (en) * | 2023-04-13 | 2023-09-05 | 重庆交通大学 | Preparation method of modified phosphogypsum-based self-leveling mortar |
| CN116693321B (en) * | 2023-04-13 | 2024-05-10 | 重庆交通大学 | Preparation method of modified phosphogypsum-based self-leveling mortar |
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