CN112194399B - Modified waste putty, preparation method thereof and self-leveling mortar - Google Patents

Modified waste putty, preparation method thereof and self-leveling mortar Download PDF

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Publication number
CN112194399B
CN112194399B CN202011391798.9A CN202011391798A CN112194399B CN 112194399 B CN112194399 B CN 112194399B CN 202011391798 A CN202011391798 A CN 202011391798A CN 112194399 B CN112194399 B CN 112194399B
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waste putty
putty
self
water
meshes
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CN112194399A (en
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于长涛
唐振中
张琴琴
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Guangdong Bozhilin Robot Co Ltd
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Guangdong Bozhilin Robot Co Ltd
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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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/04—Heat treatment
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/16—Waste materials; Refuse from building or ceramic industry
    • 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
    • C04B28/16—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 containing anhydrite, e.g. Keene's cement
    • 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
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Civil Engineering (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention relates to modified waste putty, a preparation method thereof and self-leveling mortar. The preparation method of the modified waste putty comprises the following steps: taking the waste putty, immersing the waste putty in an organic solvent, taking out the waste putty, immersing the waste putty in water I, and taking out the waste putty to prepare a first intermediate; burning the first intermediate at 300-400 deg.c, calcining at 900 +/-50 deg.c and cooling to prepare the second intermediate; mixing the second intermediate and water II, introducing carbon dioxide, adding a surface treating agent, and stirring to prepare a third intermediate; and (4) dehydrating, drying and grinding the third intermediate. The prepared modified waste putty has good hydrophilicity and dispersibility, can be used in self-leveling mortar to fill the gaps between aggregates and particles, is beneficial to the growth of hydrated crystals, is beneficial to the interface bonding of cement and fine aggregates, has more compact set cement, and improves the mechanical property of the mortar.

Description

Modified waste putty, preparation method thereof and self-leveling mortar
Technical Field
The invention relates to the technical field of building materials, in particular to modified waste putty, a preparation method thereof and self-leveling mortar.
Background
China is in a comprehensive urbanization stage, and city construction and expansion can last for a long time in China. China has more population, but urban population is relatively centralized, the building area per capita is smaller, and housing needs long-term rigidity, so that the building industry is developed rapidly and becomes one of the prop industries of national economy. The newly built building area in the whole country is about 20 hundred million square meters every year, and is increased year by year, so that huge building engineering inevitably generates huge building wastes.
The building wall usually needs putty to be leveled and then a veneer layer is made, and the quantity of waste putty powder falling after polishing, original putty removed by wall renovation and waste putty hardened due to moisture is huge. The waste putty and the construction waste are generally buried or stacked together in a centralized way, so that on one hand, large-area land is occupied, the alkalinity of the soil is increased, the properties of the soil body are influenced, and further, the water quality and the polluted air are influenced; on the other hand, the waste putty is not treated and is stacked disorderly, so that the urban image is influenced. Therefore, how to effectively treat and recycle the waste putty becomes an important research direction.
According to relevant literature, currently, the research on recycling of waste putty is mainly focused on the fields of chemical industry and building materials, for example, patent CN109608088A discloses a concrete alkali activator prepared from waste putty, patent CN107934932A discloses hydroxyapatite prepared from waste putty powder, and patent CN107325616A discloses a method for recycling waste interior wall putty. In general, there are few reports on recycling of waste putty, and there is a need to develop a new method for modifying waste putty to broaden the application of waste putty.
Disclosure of Invention
Based on the method, the prepared modified waste putty has good hydrophilicity and dispersibility, can be used in self-leveling mortar, can fill aggregate and gaps among particles, is beneficial to the growth of hydrated crystals, is beneficial to the interface bonding of cement and fine aggregate, is more compact in set cement, and improves the mechanical property of the mortar.
The preparation method of the modified waste putty comprises the following steps:
taking the waste putty, immersing the waste putty in an organic solvent, taking out the waste putty, immersing the waste putty in water I, and taking out the waste putty to prepare a first intermediate;
burning the first intermediate at 300-400 ℃, calcining at 900 +/-50 ℃, and cooling to prepare a second intermediate;
mixing the second intermediate and water II, introducing carbon dioxide, adding a surface treating agent, and stirring to prepare a third intermediate;
and carrying out dehydration, drying and grinding treatment on the third intermediate.
In one embodiment, the burning time is 10min to 20min, and the calcining time is 1.5h to 2 h. Removing organic matters, and decomposing calcium carbonate in the waste putty at high temperature to generate calcium oxide.
In one embodiment, the mass of the introduced carbon dioxide accounts for 75-79% of the mixed mass of the second intermediate and the water II. Preparing high-purity calcium carbonate.
In one embodiment, the surface treatment agent is stearic acid.
In one embodiment, the stirring time is 3min-5min, and the stirring speed is 500r/min-800 r/min. The surface treatment agent is fully coated on the surface of the calcium carbonate suspended particles by high-speed stirring, so that the surface activity of the particles is improved.
In one embodiment, the waste putty has a particle size greater than 16 mesh. And large-particle impurities such as stones, coarse sand, construction waste and the like are screened, so that the workability of subsequent self-leveling mortar is improved.
In one embodiment, the organic solvent is one or more selected from anhydrous methanol, ethanol, dichloromethane, trichloroethane, acetone, isopropanol and diacetone alcohol, and the immersion time is 3h-5 h. Dissolving part of organic matters in the waste putty.
In one embodiment, the temperature of the water I is 65-75 ℃, and the soaking time is 1-3 h. Dissolving part of organic matters in the waste putty.
In one embodiment, the grinding is performed to a particle size of 200 mesh to 220 mesh. The particle size is similar to that of cement.
The invention also provides modified waste putty prepared by the preparation method.
The invention also provides self-leveling mortar, and the preparation raw materials comprise the modified waste putty prepared by the preparation method or the modified waste putty, a gel material, aggregate and an additive.
In one embodiment, the gel material is selected from one or more of portland cement, sulphoaluminate cement, high alumina cement, anhydrite and re-dispersible latex powder.
In one embodiment, the aggregate is quartz sand with the particle size of 70 meshes to 140 meshes and quartz sand with the particle size of 20 meshes to 70 meshes.
In one embodiment, the additive is selected from one or more of a high-efficiency water reducing agent, an early strength agent, an antifoaming agent, a retarder, a water retention agent and organic fibers.
In one embodiment, the gel material is portland cement, sulphoaluminate cement, anhydrite and redispersible latex powder; the aggregate is quartz sand with the grain size of 70 meshes to 140 meshes and quartz sand with the grain size of 20 meshes to 70 meshes; the additive is a high-efficiency water reducing agent, an early strength agent, a defoaming agent, a retarder, a water-retaining agent and organic fibers;
the weight portion of the modified waste putty is 15-25; 20-27 parts of Portland cement; 8-12 parts of sulphoaluminate cement; 1-2 parts of anhydrite; 0.3-0.8 part of redispersible latex powder; 20-30 parts of quartz sand with the particle size of 70-140 meshes; 10-20 parts of quartz sand with the particle size of 20-70 meshes; the weight portion of the high-efficiency water reducing agent is 0.1-0.3 portion; 0.05 to 0.15 portion of early strength agent; the weight portion of the defoaming agent is 0.2-0.4 portion; the retarder is 0.08-0.15 part by weight; the weight portion of the water-retaining agent is 0.09-0.12 portion; the weight portion of the organic fiber is 0.1-0.15 portion.
Compared with the prior art, the invention has the following beneficial effects:
the invention immerses the waste putty in organic solvent, soaks in water, burns and calcines at high temperature, deeply removes the reacted organic matters in the waste putty, such as polymer resin glue film, cellulose film, etc., prevents the reaction between the follow-up mortar new materials from being affected, and improves the caking property and durability of the mortar. Meanwhile, the waste putty is purified through high-temperature burning, calcining, ventilating and activating modification to synthesize high-purity calcium carbonate, so that the particles have good hydrophilicity and dispersibility, can fill aggregates and gaps among the particles, are beneficial to the crystal growth of hydration products, and are beneficial to the interface bonding of cement and fine aggregates, the set cement is more compact, and the mechanical property of the mortar is improved by 15-20% compared with that of the waste putty which is not modified.
The modified waste putty is doped into self-leveling mortar to play the following roles: 1) replace part of cement to participate in hydration reaction, and enhance the strength of the mortar. 2) The aggregate is used for filling the stacking gaps of the quartz sand and the gaps among the particles, so that the compactness of the mortar is improved, and the size change rate is reduced. 3) The waste putty is doped to accelerate the hydration of cement, generate the carbonate aluminate and improve the micropore structure of the mortar. 4) The modified waste putty pair C3S (tricalcium silicate) has obvious microcrystalline nucleation effect, so that Ca (OH) around the S (tricalcium silicate)2Nucleation is preferential and growth occurs on the surface, Ca (OH)2The grain is refined, which is beneficial to interface bonding, so thatThe cement stone is more compact, and the toughness and the strength of the cement stone are enhanced. 5) The production cost of the mortar is reduced, and the mortar has important social and economic benefits and application prospects.
The performance index of the self-leveling mortar completely meets the technical requirement of a C20F4 cushion layer in the standard of JC/T985-2017 cement-based self-leveling mortar for the ground. And (5) performing dry construction, wherein the construction thickness is 5-15 mm. The method solves the problem of treatment of the waste putty, changes waste into valuable by recycling the waste putty, avoids resource waste and environmental pollution, and reduces the production cost of the self-leveling mortar.
Detailed Description
The present invention will be described in further detail with reference to specific examples. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The putty is prepared by taking synthetic resin emulsion, polymer powder and an inorganic cementing material as main binders and matching with fillers (such as double-flying powder, talcum powder and the like) and auxiliaries.
The self-leveling mortar is a self-leveling floor material prepared from a gel material (cement, gypsum and the like), aggregate and additives (such as a water reducing agent, a defoaming agent, a retarder, an early strength agent and the like).
The main component of the recycled waste putty powder is CaCO3、MgCO3、Hydrous magnesium silicate.
A preparation method of modified waste putty comprises the following steps:
taking the waste putty, immersing the waste putty in an organic solvent, taking out the waste putty, immersing the waste putty in water I, and taking out the waste putty to prepare a first intermediate;
burning the first intermediate at 300-400 ℃, calcining at 900 +/-50 ℃, and cooling to prepare a second intermediate;
mixing the second intermediate and water II, introducing carbon dioxide, adding a surface treating agent, and stirring to prepare a third intermediate;
and carrying out dehydration, drying and grinding treatment on the third intermediate.
Preferably, the particle size of the waste putty is larger than 16 meshes. The waste putty with the particle size larger than 16 meshes can be obtained by sieving, and the recovered waste putty is sieved by a 16-mesh square-hole sieve to screen out large-particle impurities such as stones, coarse sand, construction waste and the like, so that the workability of subsequent self-leveling mortar is improved. It is understood that the construction waste means bricks, cement mortar, bark, etc.
The mechanism of modifying the waste putty is as follows:
immersing the waste putty in an organic solvent to dissolve part of organic matters in the waste putty. Preferably, the organic solvent is one or more selected from the group consisting of anhydrous methanol, ethanol, dichloromethane, trichloroethane, acetone, isopropanol and diacetone alcohol. Preferably, the immersion time is 3h to 5 h. It will be appreciated that the system may be stirred during immersion, in one embodiment every 1 h. The waste putty can be removed from the organic solvent by removing the upper solution and then filtering and separating.
Taking out, adding water I into the waste putty, stirring while adding the water I to ensure that the water I is uniformly dispersed in the waste putty, and dissolving part of organic matters in the waste putty. Preferably, the water I is warmed to 65-75 ℃ to soak the waste putty at that temperature. Preferably, the soaking time is 1h-3 h. It will be appreciated that the system may be agitated during the soaking process, in one embodiment every 1 hour. The waste putty can be taken out of the water I by a filtration separation method to prepare a first intermediate.
The first intermediate is firstly burned at 300-400 ℃, and then calcined at 900 +/-50 ℃, organic matters which are not completely removed in the steps are further removed, and simultaneously, calcium carbonate in the waste putty is decomposed at high temperature to generate calcium oxide, and a second intermediate is prepared.
Preferably, the burning time is 10min-20 min.
Preferably, the calcination time is 1.5h to 2 h.
And adding water II into the second intermediate, introducing carbon dioxide to obtain a suspension, adding a surface treating agent into the suspension to be stirred so that the surface of suspended calcium carbonate particles is coated with the surface treating agent, and preparing a third intermediate.
Preferably, the mass of the introduced carbon dioxide accounts for 75-79% of the mixed mass of the second intermediate and the water II.
Preferably, the surface treatment agent is stearic acid.
Preferably, the addition mass of the surface treatment agent accounts for 0.8-1.2% of the mass of the suspension.
Preferably, the stirring time is 3min-5min, and the stirring speed is 500r/min-800 r/min. The surface treatment agent is fully coated on the surface of the calcium carbonate suspended particles by high-speed stirring, so that the surface activity of the particles is improved.
And (3) placing the third intermediate in a centrifuge for dehydration for 0.5h-1.5h, and then placing at 100-110 ℃ for drying for 1h-3 h. And grinding the mixture to 200-220 meshes to obtain the modified waste putty. The particle size is similar to that of cement.
The waste putty is different from common putty, wherein common putty powder is an unhydrated active material, and the waste putty is a completely hydrated inactive material. The invention carries out modification treatment on the waste putty, and the modified waste putty can be doped in mortar to be used as aggregate. In the mortar, cement hydration product crystal nuclei are often formed by means of areas such as aggregate surfaces, interfaces and the like, after the modified waste putty is added into the mortar, the original interface of high-energy crystal nuclei and liquid is replaced by the interface of low-energy crystal nuclei and a nucleation aggregate (namely the modified waste putty), so that nucleation barriers are reduced, cement hydration is accelerated, and the toughness and the strength of the mortar are enhanced.
On one hand, the reacted organic matters such as polymer resin films, cellulose films and the like in the waste putty can be deeply removed by respectively immersing the waste putty in an organic solvent, immersing the waste putty in water, burning and calcining the waste putty at high temperature, so that the influence on the reaction between the subsequent new mortar materials is prevented, and the caking property and the durability of the mortar are improved. On the other hand, the waste putty is purified through high-temperature burning, calcining, ventilating and activating modification to synthesize high-purity calcium carbonate, so that the particles have good hydrophilicity and dispersibility, can fill aggregates and gaps among the particles, are beneficial to the crystal growth of hydration products, and the interface bonding of cement and fine aggregates, and are more compact in set cement, and the mechanical property of the mortar is improved by 15-20% compared with that of the non-modified waste putty.
A modified waste putty is prepared by the preparation method.
The modified waste putty is doped into self-leveling mortar to play the following roles: 1) replace part of cement to participate in hydration reaction, and enhance the strength of the mortar. 2) The aggregate is used for filling the stacking gaps of the quartz sand and the gaps among the particles, so that the compactness of the mortar is improved, and the size change rate is reduced. 3) The waste putty is doped to accelerate the hydration of cement, generate the carbonate aluminate and improve the micropore structure of the mortar. 4) The modified waste putty pair C3S (tricalcium silicate) has obvious microcrystalline nucleation effect, so that Ca (OH) around the S (tricalcium silicate)2Nucleation is preferential and growth occurs on the surface, Ca (OH)2The grain is refined, which is beneficial to interface bonding, so that the set cement is more compact, and the toughness and the strength of the set cement are enhanced. 5) The production cost of the mortar is reduced, and the mortar has important social and economic benefits and application prospects.
The invention firstly provides the method for recycling the waste putty to prepare the self-leveling mortar.
The self-leveling mortar has the preparation material including the modified waste putty prepared in the preparation process, gel material, aggregate and additive.
Preferably, the gel material is selected from one or more of portland cement, sulphoaluminate cement, high-alumina cement, anhydrite and redispersible latex powder.
Preferably, the aggregate is quartz sand with the particle size of 70 meshes to 140 meshes and quartz sand with the particle size of 20 meshes to 70 meshes.
Preferably, the additive is selected from one or more of a high-efficiency water reducing agent, an early strength admixture, a defoaming agent, a retarder, a water retention agent and organic fibers.
Preferably, the gel material is portland cement, sulphoaluminate cement, anhydrite and redispersible latex powder; the aggregate is quartz sand (coarse sand) with the grain size of 70 meshes to 140 meshes and quartz sand (fine sand) with the grain size of 20 meshes to 70 meshes; the additive is a high-efficiency water reducing agent, an early strength agent, a defoaming agent, a retarder, a water-retaining agent and organic fibers;
the weight portion of the modified waste putty is 15-25; 20-27 parts of Portland cement; 8-12 parts of sulphoaluminate cement; 1-2 parts of anhydrite; 0.3-0.8 part of redispersible latex powder; 20-30 parts of quartz sand with the particle size of 70-140 meshes; 10-20 parts of quartz sand with the particle size of 20-70 meshes; the weight portion of the high-efficiency water reducing agent is 0.1-0.3 portion; 0.05 to 0.15 portion of early strength agent; the weight portion of the defoaming agent is 0.2-0.4 portion; the retarder is 0.08-0.15 part by weight; the weight portion of the water-retaining agent is 0.09-0.12 portion; the weight portion of the organic fiber is 0.1-0.15 portion.
Preferably, the portland cement is PO42.5 cement.
Preferably, the early strength agent is lithium carbonate.
Preferably, the retarder is L + tartaric acid.
Preferably, the water retaining agent is a cellulose ether.
Preferably, the organic fiber is one or more of polypropylene fiber and polyester fiber.
The performance index of the self-leveling mortar completely meets the technical requirement of a C20F4 cushion layer in the standard of JC/T985-2017 cement-based self-leveling mortar for the ground. In addition, the self-leveling mortar is a dry powder premix, is constructed by a dry method, is simple and convenient to operate, has the construction thickness of 5-15mm, can be used only by uniformly stirring according to the specified water-material ratio, is easy to weigh errors compared with the situation that field workers mix the raw materials, and has obvious advantages, and the performance of the self-leveling mortar is easy to control. Meanwhile, the treatment problem of the waste putty is solved, the waste putty is recycled, waste is changed into valuable, resource waste and environmental pollution are avoided, and the production cost of the self-leveling mortar is reduced. The self-leveling mortar is mainly applied to the fields of repairing of building floors and self-leveling engineering, and is a high-performance building material.
The following examples and comparative examples are further described below, and the starting materials used in the following examples can be commercially available, unless otherwise specified, and the equipment used therein can be commercially available, unless otherwise specified.
Example 1
The embodiment provides modified waste putty and a preparation method thereof, and the preparation method comprises the following steps:
1) recovering waste putty, sieving by a 16-mesh square-hole sieve to remove large-particle impurities such as stones, coarse sand, construction waste and the like, completely immersing the waste putty with the particle size larger than 16 meshes in 75% ethanol (75% by mass of ethanol aqueous solution) for 4 hours (stirring once every 1 hour), filtering to remove upper-layer liquid, adding room-temperature water (namely water I) into the solid, stirring while adding to disperse the solid uniformly, heating to 65 ℃, soaking for 2 hours (stirring once every 1 hour), and filtering to separate liquid, wherein the obtained solid is a first intermediate.
2) And (3) burning the first intermediate at 350 ℃ for 15min, heating to 900 ℃ and calcining for 2h, and cooling to room temperature to obtain a second intermediate.
3) Adding water (namely water II) into the second intermediate, stirring, and introducing CO accounting for 79% of the mixed mass of the second intermediate and the water II2To obtain a suspension with solid particles of calcium carbonate, adding stearic acid (analytically pure, available from Guangzhou Strength chemical reagents, Inc.) accounting for 0.8% of the mass of the suspension, and stirring at 500r/min for 5min to fully wrap the stearic acid on the calcium carbonate to obtain a third intermediate.
4) And (3) placing the third intermediate in a centrifuge for dehydration for 1h, then placing at 105 ℃ for drying for 2h, and grinding to 200-220 meshes to obtain the modified waste putty.
Example 2
The embodiment provides modified waste putty and a preparation method thereof, and the preparation method comprises the following steps:
1) recovering waste putty, sieving by a 16-mesh square-hole sieve to remove large-particle impurities such as stones, coarse sand, construction waste and the like, completely immersing the waste putty with the particle size larger than 16 meshes in dichloromethane for 4 hours (stirring once every 1 hour), filtering to remove upper-layer liquid, adding room-temperature water (namely water I) into the solid, stirring while adding to uniformly disperse the liquid, heating to 70 ℃, soaking for 2 hours (stirring once every 1 hour), and filtering to separate the liquid, wherein the obtained solid is a first intermediate.
2) Burning the first intermediate at 300 deg.C for 15min, heating to 900 deg.C, calcining for 1.5h, and cooling to room temperature to obtain the second intermediate.
3) Adding water (namely water II) into the second intermediate, stirring, and introducing CO accounting for 78% of the mixed mass of the second intermediate and the water II2To obtain a suspension of calcium carbonate as solid particles, adding stearic acid (analytically pure, available from Guangzhou Strength chemical reagents, Ltd.) in an amount of 1% by mass of the suspension, and stirring at 800r/min for 3min to fully wrap the stearic acid on the calcium carbonate to obtain a third intermediate.
4) And (3) placing the third intermediate in a centrifuge for dehydration for 1h, then placing at 105 ℃ for drying for 2h, and grinding to 200-220 meshes to obtain the modified waste putty.
Example 3
The embodiment provides modified waste putty and a preparation method thereof, and the preparation method comprises the following steps:
1) recovering waste putty, sieving by a 16-mesh square-hole sieve to remove large-particle impurities such as stones, coarse sand, construction waste and the like, completely immersing the waste putty with the particle size larger than 16 meshes in acetone for 4 hours (stirring once every 1 hour), filtering to remove upper-layer liquid, adding room-temperature water (namely water I) into the solid, stirring while adding to uniformly disperse the liquid, heating to 75 ℃, soaking for 2 hours (stirring once every 1 hour), and filtering and separating the liquid to obtain the solid which is a first intermediate.
2) Burning the first intermediate at 400 deg.C for 15min, heating to 900 deg.C, calcining for 1.5h, and cooling to room temperature to obtain the second intermediate.
3) Adding water (namely water II) into the second intermediate, stirring, and introducing CO accounting for 75% of the mixed mass of the second intermediate and the water II2To obtain a suspension with solid particles of calcium carbonate, adding stearic acid (analytically pure, available from Guangzhou Strength chemical reagents, Inc.) accounting for 1.2% of the mass of the suspension, and stirring at 600r/min for 5min to fully wrap the stearic acid on the calcium carbonate to obtain a third intermediate.
4) And (3) placing the third intermediate in a centrifuge for dehydration for 1h, then placing at 105 ℃ for drying for 2h, and grinding to 200-220 meshes to obtain the modified waste putty.
Comparative example 1
The comparative example provides modified waste putty and a preparation method thereof, and the steps are as follows:
1) recovering waste putty, sieving by a 16-mesh square-hole sieve to remove large-particle impurities such as stones, coarse sand, construction waste and the like, completely immersing the waste putty with the particle size larger than 16 meshes in 75% ethanol (75% by mass of ethanol aqueous solution) for 4 hours (stirring once every 1 hour), filtering to remove upper-layer liquid, adding room-temperature water (namely water I) into the solid, stirring while adding to disperse the solid uniformly, heating to 65 ℃, soaking for 2 hours (stirring once every 1 hour), and filtering to separate liquid, wherein the obtained solid is a first intermediate.
2) And (3) burning the first intermediate at 350 ℃ for 2h, and cooling to room temperature to obtain a second intermediate.
3) Adding water into the second intermediate, adding stearic acid (analytically pure, purchased from Guangzhou Strength chemical reagents, Ltd.) accounting for 0.8% of the mixed mass of the second intermediate and the water II, and stirring at 500r/min for 5min to obtain a third intermediate.
4) And (3) placing the third intermediate in a centrifuge for dehydration for 1h, then placing at 105 ℃ for drying for 2h, and grinding to 200-220 meshes to obtain the modified waste putty.
Example 4
The embodiment provides self-leveling mortar and a preparation method thereof, and the preparation method comprises the following steps:
weighing 20 parts of PO42.5 cement; 11 parts of sulphoaluminate cement; 1.2 parts of anhydrite; 20 parts of quartz sand (coarse sand 70-140 meshes); 10 parts of quartz sand (fine sand of 20-70 meshes); 20 parts of modified waste putty prepared in example 1; 0.15 part of polypropylene fiber; 0.09 part of cellulose ether; 0.4 part of redispersible latex powder; 0.10 part of L + tartaric acid; 0.05 part of lithium carbonate; 0.2 part of P803 (defoaming agent) and 0.15 part of polycarboxylic acid water reducing agent.
The raw materials are uniformly mixed to prepare the self-leveling mortar dry powder, and when the self-leveling mortar dry powder is used, water is added into the self-leveling mortar dry powder, wherein the water-material ratio is 0.21.
Example 5
The embodiment provides self-leveling mortar and a preparation method thereof, and the preparation method comprises the following steps:
weighing 20 parts of PO42.5 cement; 11 parts of sulphoaluminate cement; 1.2 parts of anhydrite; 20 parts of quartz sand (coarse sand 70-140 meshes); 10 parts of quartz sand (fine sand of 20-70 meshes); 20 parts of modified waste putty prepared in example 2; 0.15 part of polypropylene fiber; 0.09 part of cellulose ether; 0.4 part of redispersible latex powder; 0.10 part of L + tartaric acid; 0.05 part of lithium carbonate; 0.2 part of P803 (defoaming agent) and 0.15 part of polycarboxylic acid water reducing agent.
The raw materials are uniformly mixed to prepare the self-leveling mortar dry powder, and when the self-leveling mortar dry powder is used, water is added into the self-leveling mortar dry powder, wherein the water-material ratio is 0.21.
Example 6
The embodiment provides self-leveling mortar and a preparation method thereof, and the preparation method comprises the following steps:
weighing 20 parts of PO42.5 cement; 11 parts of sulphoaluminate cement; 1.2 parts of anhydrite; 20 parts of quartz sand (coarse sand 70-140 meshes); 10 parts of quartz sand (fine sand of 20-70 meshes); 20 parts of modified waste putty prepared in example 3; 0.15 part of polypropylene fiber; 0.09 part of cellulose ether; 0.4 part of redispersible latex powder; 0.10 part of L + tartaric acid; 0.05 part of lithium carbonate; 0.2 part of P803 (defoaming agent) and 0.15 part of polycarboxylic acid water reducing agent.
The raw materials are uniformly mixed to prepare the self-leveling mortar dry powder, and when the self-leveling mortar dry powder is used, water is added into the self-leveling mortar dry powder, wherein the water-material ratio is 0.21.
Example 7
The embodiment provides self-leveling mortar and a preparation method thereof, and the preparation method comprises the following steps:
weighing 24 parts of PO42.5 cement; 10 parts of sulphoaluminate cement; 1.2 parts of anhydrite; 25 parts of quartz sand (coarse sand 70-140 meshes); 15 parts of quartz sand (fine sand of 20-70 meshes); 25 parts of modified waste putty prepared in example 1; 0.15 part of polyester fiber; 0.11 part of cellulose ether; 0.5 part of redispersible latex powder; 0.08 part of L + tartaric acid; 0.05 part of lithium carbonate; 0.2 part of P803 (defoaming agent) and 0.2 part of polycarboxylic acid water reducing agent.
The raw materials are uniformly mixed to prepare the self-leveling mortar dry powder, and when the self-leveling mortar dry powder is used, water is added into the self-leveling mortar dry powder, wherein the water-material ratio is 0.215.
Example 8
The embodiment provides self-leveling mortar and a preparation method thereof, and the preparation method comprises the following steps:
weighing 26 parts of PO42.5 cement; 11 parts of sulphoaluminate cement; 1.6 parts of anhydrite; 24 parts of quartz sand (coarse sand 70-140 meshes); 15 parts of quartz sand (fine sand of 20-70 meshes); 21 parts of modified waste putty prepared in example 1; 0.13 part of polyester fiber; 0.12 part of cellulose ether; 0.3 part of redispersible latex powder; 0.13 part of L + tartaric acid; 0.09 part of lithium carbonate; 0.3 part of P803 (defoaming agent) and 0.22 part of polycarboxylic acid water reducing agent.
The raw materials are uniformly mixed to prepare the self-leveling mortar dry powder, and when the self-leveling mortar dry powder is used, water is added into the self-leveling mortar dry powder, wherein the water-material ratio is 0.22.
Example 9
The embodiment provides self-leveling mortar and a preparation method thereof, and the preparation method comprises the following steps:
weighing 25 parts of PO42.5 cement; 11 parts of sulphoaluminate cement; 1.7 parts of anhydrite; 28 parts of quartz sand (coarse sand 70-140 meshes); 19 parts of quartz sand (fine sand of 20-70 meshes); 24 parts of modified waste putty prepared in example 1; 0.15 part of polypropylene fiber; 0.12 part of cellulose ether; 0.7 part of redispersible latex powder; 0.13 part of L + tartaric acid; 0.15 part of lithium carbonate; 0.4 part of P803 (defoaming agent) and 0.3 part of polycarboxylic acid water reducing agent.
The raw materials are uniformly mixed to prepare the self-leveling mortar dry powder, and when the self-leveling mortar dry powder is used, water is added into the self-leveling mortar dry powder, wherein the water-material ratio is 0.21.
Comparative example 2
The comparative example provides a self-leveling mortar and a preparation method thereof, and the steps are as follows:
weighing 20 parts of PO42.5 cement; 11 parts of sulphoaluminate cement; 1.2 parts of anhydrite; 20 parts of quartz sand (coarse sand 70-140 meshes); 10 parts of quartz sand (fine sand of 20-70 meshes); 20 parts of modified waste putty prepared in comparative example 1; 0.15 part of polypropylene fiber; 0.09 part of cellulose ether; 0.4 part of redispersible latex powder; 0.10 part of L + tartaric acid; 0.05 part of lithium carbonate; 0.2 part of P803 (defoaming agent) and 0.15 part of polycarboxylic acid water reducing agent.
The raw materials are uniformly mixed to prepare the self-leveling mortar dry powder, and when the self-leveling mortar dry powder is used, water is added into the self-leveling mortar dry powder, wherein the water-material ratio is 0.21.
Comparative example 3
The comparative example provides a self-leveling mortar and a preparation method thereof, and the steps are as follows:
weighing 20 parts of PO42.5 cement; 11 parts of sulphoaluminate cement; 1.2 parts of anhydrite; 20 parts of quartz sand (coarse sand 70-140 meshes); 10 parts of quartz sand (fine sand of 20-70 meshes); 20 parts of heavy calcium carbonate; 0.15 part of polypropylene fiber; 0.09 part of cellulose ether; 0.4 part of redispersible latex powder; 0.10 part of L + tartaric acid; 0.05 part of lithium carbonate; 0.2 part of P803 (defoaming agent) and 0.15 part of polycarboxylic acid water reducing agent.
The raw materials are uniformly mixed to prepare the self-leveling mortar dry powder, and when the self-leveling mortar dry powder is used, water is added into the self-leveling mortar dry powder, wherein the water-material ratio is 0.21.
Taking the mortar of the above examples and comparative examples, and carrying out performance test according to JC/T985-. The results are given in table 1 below.
TABLE 1
Figure 223446DEST_PATH_IMAGE001
It can be seen that the mortars prepared in examples 4-9 can achieve a self-leveling effect, the performance index completely meets the technical requirement of the C20F4 cushion layer in the standard of JC/T985-2017 cement-based self-leveling mortar for the ground, and compared with the comparative example 3, the construction performance and the mechanical property of example 4 are both improved, and even the mechanical property can be improved by 15-20%. In addition, with the combination of the comparative example 2, when the waste putty is not purified and added into the self-leveling mortar, the construction performance and the mechanical property of the self-leveling mortar are inferior to those of the comparative example 3.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (14)

1. The preparation method of the modified waste putty is characterized by comprising the following steps:
taking the waste putty, immersing the waste putty in an organic solvent, taking out the waste putty, immersing the waste putty in water I, and taking out the waste putty to prepare a first intermediate;
burning the first intermediate at 300-400 ℃, calcining at 900 +/-50 ℃, and cooling to prepare a second intermediate;
mixing the second intermediate and water II, introducing carbon dioxide, adding a surface treating agent, and stirring to prepare a third intermediate;
dehydrating, drying and grinding the third intermediate;
the organic solvent is selected from one or more of anhydrous methanol, ethanol, dichloromethane, trichloroethane, acetone, isopropanol and diacetone alcohol, and the immersion time is 3-5 h;
the burning time is 10min-20min, and the calcining time is 1.5h-2 h;
the main component of the waste putty is CaCO3、MgCO3And hydrous magnesium silicate.
2. The method for preparing the modified waste putty as claimed in claim 1, characterized in that the mass of the introduced carbon dioxide accounts for 75% -79% of the mixed mass of the second intermediate and the water II.
3. The method for preparing modified waste putty as set forth in claim 1, characterized in that the surface treatment agent is stearic acid.
4. The method for preparing modified waste putty as set forth in claim 3, characterized in that the stirring time is 3min-5min, and the stirring speed is 500r/min-800 r/min.
5. The method for preparing modified waste putty as set forth in claim 1, characterized in that the particle size of the waste putty is larger than 16 meshes.
6. The method for preparing modified waste putty as set forth in any one of claims 1 to 5 characterized in that the immersion time is 4 hours.
7. The method for preparing modified waste putty as set forth in any one of claims 1 to 5, characterized in that the temperature of the water I is 65 ℃ to 75 ℃ and the soaking time is 1h to 3 h.
8. The method for preparing modified waste putty as set forth in any one of claims 1 to 5, characterized in that the grinding is carried out to a particle size of 200 mesh to 220 mesh.
9. A modified waste putty characterized by being prepared by the preparation method as set forth in any one of claims 1 to 8.
10. A self-leveling mortar, characterized in that raw materials for its preparation comprise the modified waste putty prepared by the preparation method of any one of claims 1 to 8 or the modified waste putty of claim 9, a gel material, an aggregate and an admixture.
11. The self-leveling mortar of claim 10, wherein the gel material is selected from one or more of portland cement, sulphoaluminate cement, high alumina cement, anhydrite and redispersible latex powder.
12. The self-leveling mortar of claim 10, wherein the aggregate is quartz sand having a particle size of 70 mesh to 140 mesh and quartz sand having a particle size of 20 mesh to 70 mesh.
13. The self-leveling mortar of claim 10, wherein the admixture is selected from one or more of a high-efficiency water reducing agent, an early strength agent, a defoaming agent, a retarder, a water retention agent and organic fibers.
14. The self-leveling mortar of any one of claims 10 to 13, wherein the gelling materials are portland cement, sulphoaluminate cement, anhydrite and redispersible latex powders; the aggregate is quartz sand with the grain size of 70 meshes to 140 meshes and quartz sand with the grain size of 20 meshes to 70 meshes; the additive is a high-efficiency water reducing agent, an early strength agent, a defoaming agent, a retarder, a water-retaining agent and organic fibers;
the weight portion of the modified waste putty is 15-25; 20-27 parts of Portland cement; 8-12 parts of sulphoaluminate cement; 1-2 parts of anhydrite; 0.3-0.8 part of redispersible latex powder; 20-30 parts of quartz sand with the particle size of 70-140 meshes; 10-20 parts of quartz sand with the particle size of 20-70 meshes; the weight portion of the high-efficiency water reducing agent is 0.1-0.3 portion; 0.05 to 0.15 portion of early strength agent; the weight portion of the defoaming agent is 0.2-0.4 portion; the retarder is 0.08-0.15 part by weight; the weight portion of the water-retaining agent is 0.09-0.12 portion; the weight portion of the organic fiber is 0.1-0.15 portion.
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CN101045545A (en) * 2007-04-17 2007-10-03 韶关学院 Technology for producing light calcium carbonate using eggshell
CN107325616A (en) * 2017-08-15 2017-11-07 含山县金石建筑材料有限公司 A kind of renovation process of waste and old inner wall putty
CN110981397A (en) * 2019-11-27 2020-04-10 廊坊市北辰创业树脂材料股份有限公司 Cement-based self-leveling mortar and preparation method thereof

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CN107963867A (en) * 2017-12-27 2018-04-27 北京宝辰联合科技股份有限公司 A kind of gravity flowing levelling mortar

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101045545A (en) * 2007-04-17 2007-10-03 韶关学院 Technology for producing light calcium carbonate using eggshell
CN107325616A (en) * 2017-08-15 2017-11-07 含山县金石建筑材料有限公司 A kind of renovation process of waste and old inner wall putty
CN110981397A (en) * 2019-11-27 2020-04-10 廊坊市北辰创业树脂材料股份有限公司 Cement-based self-leveling mortar and preparation method thereof

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