CN110981393A - High-strength gypsum self-leveling mortar - Google Patents
High-strength gypsum self-leveling mortar Download PDFInfo
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- CN110981393A CN110981393A CN201911315138.XA CN201911315138A CN110981393A CN 110981393 A CN110981393 A CN 110981393A CN 201911315138 A CN201911315138 A CN 201911315138A CN 110981393 A CN110981393 A CN 110981393A
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- gypsum
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- leveling mortar
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Classifications
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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
-
- 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
-
- 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)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses high-strength gypsum-based self-leveling mortar, which is characterized by comprising water and powder, wherein the powder comprises, by mass, β parts of semi-hydrated gypsum 30-40 parts, 30-40 parts of quartz sands with two different fineness, 1-10 parts of modified perlite, 1-10 parts of modified bentonite, 0.1-3 parts of nano gypsum whiskers, 0.5-5 parts of redispersible latex powder, 0.01-0.05 part of hydroxypropyl methyl cellulose ether, 0.05-1 part of water reducing agent, 0.1-0.5 part of tartaric acid, 0.01-0.1 part of dispersing agent, 0.05-0.20 part of defoaming agent and the ratio of water to powder is 0.25-0.30: 1.
Description
Technical Field
The invention belongs to the technical field of inorganic non-metallic building materials, and particularly relates to high-strength gypsum self-leveling mortar.
Background
Self-leveling mortar is divided into cement base and gypsum base, and the research on self-leveling mortar is developed in the advanced countries of the United states, Japan and Europe in the sixty-seven decades of the last century, and various problems in a floor heating system are successfully solved. Due to resource shortage, desulfurized gypsum becomes the main raw material of the european gypsum-based self-leveling mortar. The research of gypsum-based self-leveling mortar in China starts in the eighties of the last century, and the gypsum-based self-leveling mortar has the characteristics of good dimensional stability, no cracking during drying, high construction speed, simple process, heat preservation, fire resistance and the like, and is more and more favored by people. The gypsum-based self-leveling mortar can be more optimized in performance by compounding gypsum and quartz sand with some functional special additives. However, the gypsum-based self-leveling mortar is an air-hardening cementing material, and phenomena such as hollowing and cracking and the like caused by insufficient strength often occur, so that the problem of improving the strength of the gypsum-based self-leveling mortar is urgently needed to be solved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the high-strength gypsum-based self-leveling mortar, and the self-leveling mortar has good mechanical property and fluidity, and particularly has excellent wear resistance and heat insulation performance.
In order to achieve the purpose, the invention adopts the following technical scheme:
the high-strength gypsum-based self-leveling mortar is characterized by comprising water and powder, wherein the powder comprises, by mass, β parts of semi-hydrated gypsum 30-40 parts, 30-40 parts of quartz sand with two different fineness, 1-10 parts of modified perlite, 1-10 parts of modified bentonite, 0.1-3 parts of nano gypsum whiskers, 0.5-5 parts of redispersible latex powder, 0.01-0.05 part of hydroxypropyl methyl cellulose ether, 0.05-1 part of water reducing agent, 0.1-0.5 part of tartaric acid, 0.01-0.1 part of dispersing agent, 0.05-0.20 part of defoaming agent, and the ratio of water to powder is 0.25-0.30: 1.
The β hemihydrate gypsum is a cementitious material in the invention, and provides hardening properties for the gypsum self-leveling mortar.
In a specific embodiment of the invention, the two kinds of quartz sand with different fineness comprise quartz sand with fineness of 40-70 meshes and quartz sand with fineness of 70-120 meshes, and the mass ratio of the two kinds of quartz sand is (1-1.5): 2, quartz sand is used as aggregate.
The modified perlite has the functions of heat preservation and suspension, and preferably, the modified perlite has low water absorption, so that the mortar has good heat preservation effect.
In a specific embodiment of the invention, the particle size of the modified bentonite is 350 meshes, and the modified bentonite can prevent the mortar from bleeding and make the mortar have good rheological property.
In a specific embodiment of the invention, the nano gypsum whisker is a semi-hydrated gypsum whisker, which can effectively improve the mechanical property of a mortar hardened body, reduce the shrinkage rate of mortar and improve the wear resistance of the mortar hardened body; the preparation method of the nano gypsum whisker comprises the steps of using a pechini sol-gel method, using pure water as a solvent, putting gypsum into water to prepare a suspension solution, then putting the suspension solution into a mixed solution of ethylene glycol and citric acid (the molar ratio is 2:1), drying the mixed solution at 150 ℃ to form a porous substance, grinding the porous substance, and calcining the ground porous substance at 600 ℃ for 3 hours to obtain the semi-hydrated gypsum whisker.
In a specific embodiment of the invention, the re-dispersible latex powder is one or a combination of 5010N and 5044N.
In a specific embodiment of the invention, the hydroxypropyl methyl cellulose ether has a viscosity of 40000mpa · s as a water retention agent.
In a specific embodiment of the invention, the water reducing agent is a powdery polycarboxylic acid high-efficiency water reducing agent.
In a specific embodiment of the invention, the retarder is tartaric acid.
In a specific embodiment of the invention, the defoaming agent used is one or a combination of two of silicone and polyether defoaming agent.
The gypsum-based self-leveling mortar can be prepared by adopting a conventional mortar preparation process mastered by a person skilled in the art.
The invention has the beneficial effects that the auxiliary filling material is added: the modified perlite and the modified bentonite can improve the heat preservation and insulation effect and the rheological property of the mortar; the self-leveling material is added with the nano gypsum whiskers, so that the mechanical property, the volume stability and the wear resistance of the mortar hardened body are improved; the self-leveling material has good mechanical property and fluidity, and particularly has excellent wear resistance and heat insulation performance.
Detailed Description
For better explanation and understanding of the present invention, the following examples are set forth to illustrate only some of the present invention, and the preferred examples should not be construed as limiting the scope of the present invention.
Preparing nano gypsum whiskers: the method comprises the steps of utilizing a pechini sol-gel method, utilizing pure water as a solvent, putting gypsum into water to prepare a suspension solution, then putting the suspension solution into a mixed solution of ethylene glycol and citric acid (the molar ratio is 2:1), drying the mixed solution at 150 ℃ to form a porous substance, grinding the porous substance, and calcining the ground porous substance at 600 ℃ for 3 hours to obtain the hemihydrate gypsum whisker.
The invention provides a preparation method of high-strength gypsum-based self-leveling mortar, which comprises the steps of fully mixing β hemihydrate gypsum modified perlite, modified bentonite, nano gypsum whisker and an additive, uniformly mixing with standard sand with the fineness of 40-70 meshes and 70-120 meshes, adding water, and stirring for 3min to obtain the high-strength gypsum-based self-leveling material.
Example 1
The high-strength gypsum-based self-leveling mortar comprises, by mass, β parts of semi-hydrated gypsum, 39 parts of quartz sand with two different fineness, wherein 13 parts of quartz sand with 40-70 meshes, 26 parts of quartz sand with 70-120 meshes, 5 parts of modified perlite, 5 parts of modified bentonite, 1.2 parts of nano gypsum whisker, 1.5 parts of redispersible latex powder, 0.025 part of hydroxypropyl methyl cellulose ether, 0.20 part of water reducing agent, 0.15 part of tartaric acid, 0.06 part of dispersing agent, 0.02 part of defoaming agent, and the mass ratio of water to powder is 0.30.
Example 2
The gypsum-based self-leveling mortar powder comprises, by mass, β parts of semi-hydrated gypsum, 30 parts of quartz sand with two different fineness, wherein 12 parts of quartz sand with 40-70 meshes, 18 parts of quartz sand with 70-120 meshes, 3 parts of modified perlite, 6 parts of modified bentonite, 1.0 part of nano gypsum whisker, 1.2 parts of redispersible latex powder, 0.03 part of hydroxypropyl methyl cellulose ether, 0.23 part of water reducing agent, 0.10 part of tartaric acid, 0.08 part of dispersing agent and 0.01 part of defoaming agent, and the mass ratio of water to powder is 0.29.
Example 3
The gypsum-based self-leveling mortar powder comprises, by mass, β parts of semi-hydrated gypsum, 38 parts of quartz sand with two different fineness, wherein 17 parts of quartz sand with 40-70 meshes, 31 parts of quartz sand with 70-120 meshes, 3 parts of modified perlite, 6 parts of modified bentonite, 0.8 part of nano gypsum whisker, 2.0 parts of redispersible latex powder, 0.02 part of hydroxypropyl methyl cellulose ether, 0.25 part of water reducing agent, 0.08 part of tartaric acid, 0.04 part of dispersing agent and 0.02 part of defoaming agent, and the mass ratio of water to powder is 0.285.
Example 4
The gypsum-based self-leveling mortar powder comprises, by mass, 36 parts of β semi-hydrated gypsum, 36 parts of quartz sand with two different fineness, wherein 13.5 parts of quartz sand with 40-70 meshes, 22.5 parts of quartz sand with 70-120 meshes, 3 parts of modified perlite, 4 parts of modified bentonite, 0.6 part of nano gypsum whisker, 1.3 parts of redispersible latex powder, 0.025 part of hydroxypropyl methyl cellulose ether, 0.27 part of water reducing agent, 0.10 part of tartaric acid, 0.06 part of dispersing agent, 0.02 part of defoaming agent, and the mass ratio of water to powder is 0.28.
Example 5
The gypsum-based self-leveling mortar powder comprises, by mass, 38 parts of β semi-hydrated gypsum, 34 parts of quartz sand with two different fineness, wherein 14 parts of quartz sand with 40-70 meshes, 20 parts of quartz sand with 70-120 meshes, 2 parts of modified perlite, 3 parts of modified bentonite, 0.5 part of nano gypsum whisker, 1.4 parts of redispersible latex powder, 0.02 part of hydroxypropyl methyl cellulose ether, 0.29 part of water reducing agent, 0.13 part of tartaric acid, 0.05 part of dispersing agent and 0.03 part of defoaming agent, and the mass ratio of water to powder is 0.27.
Example 6
The gypsum-based self-leveling mortar powder comprises, by mass, 40 parts of β semi-hydrated gypsum, 34 parts of quartz sand with two different fineness, 15 parts of quartz sand with 40-70 meshes, 19 parts of quartz sand with 70-120 meshes, 3 parts of modified perlite, 2 parts of modified bentonite, 0.5 part of nano gypsum whisker, 1.6 parts of redispersible latex powder, 0.02 part of hydroxypropyl methyl cellulose ether, 0.30 part of water reducing agent, 0.15 part of tartaric acid, 0.05 part of dispersing agent and 0.03 part of defoaming agent, wherein the mass ratio of water to the powder is 0.26.
Comparative example 1
The gypsum-based self-leveling mortar powder comprises, by mass, 40 parts of β semi-hydrated gypsum, 14 parts of 40-70 mesh quartz sand, 21 parts of 70-120 mesh quartz sand, 5 parts of modified bentonite, 1.6 parts of redispersible latex powder, 0.02 part of hydroxypropyl methyl cellulose ether, 0.30 part of a water reducing agent, 0.10 part of tartaric acid, 0.05 part of a dispersing agent and 0.03 part of a defoaming agent, wherein the mass ratio of water to the powder is 0.27.
TABLE 1 Properties of the gypsum-based self-leveling mortars prepared in examples 1 to 6
As can be seen from Table 1, all performance indexes of the embodiments of the invention meet all regulations of JC/T1023-2007 gypsum-based self-leveling mortar, the mechanical property and the wear resistance of self-leveling can be obviously improved by adding the nano gypsum whiskers, and the heat insulation property of the mortar can be improved by adding the modified perlite.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (10)
1. The high-strength gypsum-based self-leveling mortar is characterized by comprising water and powder, wherein the powder comprises, by mass, β parts of semi-hydrated gypsum 30-40 parts, 30-40 parts of quartz sand with two different fineness, 1-10 parts of modified perlite, 1-10 parts of modified bentonite, 0.1-3 parts of nano gypsum whiskers, 0.5-5 parts of redispersible latex powder, 0.01-0.05 part of hydroxypropyl methyl cellulose ether, 0.05-1 part of water reducing agent, 0.1-0.5 part of tartaric acid, 0.01-0.1 part of dispersing agent, 0.05-0.20 part of defoaming agent, and the ratio of water to powder is 0.25-0.30: 1.
2. The high strength gypsum-based self-leveling mortar of claim 1, wherein: the two kinds of quartz sand with different fineness comprise quartz sand with fineness of 40-70 meshes and quartz sand with fineness of 70-120 meshes, and the mass ratio of the two kinds of quartz sand is (1-1.5): 2.
3. the high strength gypsum-based self-leveling mortar of claim 1, wherein: the modified perlite is modified perlite, and has low water absorption.
4. The high strength gypsum-based self-leveling mortar of claim 1, wherein: the particle size of the modified bentonite is 350 meshes.
5. The high strength gypsum-based self-leveling mortar of claim 1, wherein: the nano gypsum whisker is a semi-hydrated gypsum whisker; the preparation method of the nano gypsum whisker comprises the steps of using a pechini sol-gel method, using pure water as a solvent, putting gypsum into water to prepare a suspension solution, then putting the suspension solution into a mixed solution of ethylene glycol and citric acid (the molar ratio is 2:1), drying the mixed solution at 150 ℃ to form a porous substance, grinding the porous substance, and calcining the ground porous substance at 600 ℃ for 3 hours to obtain the semi-hydrated gypsum whisker.
6. The high-light gypsum-based self-leveling mortar according to claim 1, wherein: the redispersible latex powder is one or the combination of two of 5010N and 5044N.
7. The high-light gypsum-based self-leveling mortar according to claim 1, wherein: the viscosity of the hydroxypropyl methyl cellulose ether is 40000mpa & s.
8. The high-light gypsum-based self-leveling mortar according to claim 1, wherein: the water reducing agent is a powdery polycarboxylic acid high-efficiency water reducing agent.
9. The high-light gypsum-based self-leveling mortar according to claim 1, wherein: the retarder is tartaric acid.
10. The high-light gypsum-based self-leveling mortar according to claim 1, wherein: the used defoaming agent is one or the combination of two of organic silicon and polyether defoaming agent.
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| CN201911315138.XA CN110981393A (en) | 2019-12-19 | 2019-12-19 | High-strength gypsum self-leveling mortar |
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| CN201911315138.XA CN110981393A (en) | 2019-12-19 | 2019-12-19 | High-strength gypsum self-leveling mortar |
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Cited By (1)
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| CN111875335A (en) * | 2020-08-09 | 2020-11-03 | 苏州智本工程技术有限公司 | Mortar special for building floor and floating building floor and production method thereof |
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Application publication date: 20200410 |