CN114907089B - Anti-cracking self-leveling material containing silica sol - Google Patents
Anti-cracking self-leveling material containing silica sol 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
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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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
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
- C04B14/062—Microsilica, e.g. colloïdal silica
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- 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
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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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Abstract
The invention belongs to the technical field of building materials, and particularly relates to an anti-cracking self-leveling material containing silica sol. The self-leveling material has the technical effect of no cracking after being laid by the self-leveling material through the water reducing agent, the defoaming agent, the retarder, the rheological agent, the silica sol, the synergist, the cross-linking agent, the desulfurized gypsum powder, the filler and the aggregate. The invention has the advantages that: adding silica sol into the self-leveling material for compounding and stirring, and improving the compression strength and the tensile strength of the self-leveling material by utilizing the characteristic of strong bonding force of the silica sol; the synergist is added to be compounded with the silica sol, so that the speed of gradually polymerizing monomer silicic acid into high polymer silica gel is slowed down, and the self-leveling material cannot crack due to too high shrinkage speed of the silica sol; adding desulfurized gypsum powder, fixing on a film formed by silica sol polymerization, and obviously inhibiting filler and aggregate in a slurry system from sinking; the desulfurization gypsum powder is prepared by compounding high-strength desulfurization gypsum powder and common desulfurization gypsum powder, and has both compressive strength and fluidity.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to an anti-cracking self-leveling material containing silica sol.
Background
The self-leveling material is a dry-mixed powder material consisting of a plurality of active ingredients, can be used after being mixed with water on site, and can obtain a high-level base surface after being slightly spread by a scraper. However, when the self-leveling material is paved, good effect is needed, watering maintenance is needed every day, otherwise, the surface is easy to crack, and the construction cost is high.
In order to improve the cracking problem of the self-leveling material after being laid, the prior art generally adopts an interface agent to brush the surface of the self-leveling material to form an emulsion film, the film formed by the emulsion has waterproof and hydrophobic effects, and the phenomenon of cracking of the self-leveling material in the drying process is effectively avoided, for example, chinese patent invention with the publication number of CN113980529A and the publication number of 2022-01-28 discloses a permeable water-based interface agent, and the self-leveling mortar has good construction performance and can reduce the pulverization and cracking phenomena of the self-leveling mortar by utilizing the water retention, thickening and air entraining effects of cellulose ether in the self-leveling mortar. However, the coating of the interface agent also requires labor waste, and increases the construction cost and material cost.
In view of the foregoing, there is a strong need in the market for a self-leveling material that does not crack when used after being laid and does not require secondary treatment.
Disclosure of Invention
The invention aims to provide an anti-cracking self-leveling material containing silica sol, which has the technical effect of preventing the self-leveling material from cracking after being laid by water reducing agent, defoaming agent, retarder, rheological agent, silica sol, synergist, cross-linking agent, desulfurized gypsum powder, filler and aggregate.
The technical scheme adopted by the invention for solving the problems is as follows: the anti-cracking self-leveling material containing silica sol comprises cement, a water reducing agent, a defoaming agent, a retarder, a rheological agent, silica sol, a synergist, a cross-linking agent, desulfurized gypsum powder, a filler and aggregate.
The silica sol is a colloid formed by mixing nano-silica and sodium silicate, the main component is sodium silicate, the secondary component is nano-silica, and the silica sol has the characteristic of strong bonding force, so that the self-leveling material is firm when used in the self-leveling material, can resist dirt, dust and aging, and more importantly, the cracking condition of the self-leveling material after condensation is obviously reduced.
In addition, the synergist can be dissolved with the silica sol in any proportion, can prepare a composite silica sol preparation with excellent performance, and has the effects of water retention, thickening, stability, crack resistance and tackifying.
The desulfurized gypsum powder is different from common gypsum powder in physical components, and various methods are applied in the production process to achieve the effect of desulfurization. After the desulfurization gypsum powder, the synergist and the silica sol are compounded for use, the desulfurization gypsum powder is fixed by a film formed by polymerization of the silica sol, so that the filler and aggregate in a slurry system can be remarkably inhibited from sinking, and the workability of a self-leveling material is improved.
In addition, the water reducing agent is a concrete admixture capable of reducing the water consumption for mixing under the conditions of maintaining a self-leveling material and basically unchanging slump. Most of them are anionic surfactants.
The defoaming agent is an agent that reduces the surface tension of water, solutions, suspensions, etc. in self-leveling materials, prevents the formation of foam, or reduces or eliminates the original foam.
The retarder is an additive which can reduce the hydration speed and the hydration heat in the self-leveling material and prolong the setting time.
The rheological agent adjusts the flow characteristics of the self-leveling material in a self-leveling material based on an aqueous formulation, and the rheological agent is also one of the thickening agents.
The cross-linking agent, also known as a bridging agent, forms an insoluble material of three-dimensional structure in the self-leveling material.
The filler is added into the self-leveling material to improve the material performance, or can increase the volume and weight and reduce the cost of the self-leveling material.
The aggregate is also called aggregate, is one of main composition materials of the self-leveling material, mainly plays a role of a skeleton and reduces volume change caused by drying shrinkage and wet expansion in the setting and hardening process of the self-leveling material.
The further preferred technical scheme is as follows: the components are mixed according to the following mass portions:
50-100 parts of cement, 2.4-5 parts of water reducing agent, 0.5-1 part of defoaming agent, 0.5-1 part of retarder, 0.3-1 part of rheological agent, 3.5-5 parts of silica sol, 0.5-1 part of synergist, 0.5-1 part of cross-linking agent, 20-37 parts of desulfurized gypsum powder, 5-10 parts of filler and 30-50 parts of aggregate.
The further preferred technical scheme is as follows: the silica sol is prepared by adopting one or more of sodium silicate and nano silicon dioxide
The sodium silicate is a water-soluble silicate and also an inorganic binder, a colloidal solution can be formed in the self-leveling mortar by adding water, the nano-silica aqueous solution is low in viscosity and can be directly added into the self-leveling mortar, the viscosity of the self-leveling material can be reduced, and the performance of the self-leveling material can be further influenced, so that a certain amount of sodium silicate is added into the nano-silica aqueous solution, the nano-silica aqueous solution is added into the self-leveling mortar to form a colloidal solution with a solidification tendency, and the subsequent solidification effect is ensured.
It should be noted that the nano-silica does not react with sodium silicate, which can be generated by the reaction of the silica and does not react with it.
The silica sol can be well dissolved with the synergist, after the silica sol loses moisture, the monomer silicic acid is gradually polymerized into high polymer silica gel, and colloid molecules are enlarged along with the evaporation of the moisture, and finally a-SIO-O-SIO-film is formed, so that the compression strength and the tensile strength of the self-leveling material are improved.
The further preferred technical scheme is as follows: the synergist comprises a polyacrylic acid salt.
Polyacrylic acid is a water-soluble high-molecular polymer, sodium polyacrylate is taken as a representative substance, the speed of gradually polymerizing monomer silicic acid into high-polymer silica gel is slowed down, so that the self-leveling material cannot crack due to the excessively high shrinkage speed of the silica sol, and meanwhile, the mutual dissolving mode cannot influence the mechanical strength of a-SIO-O-SIO-film formed by final polymerization of the silica sol, but only slows down the forming speed of the self-leveling material, so that the final self-leveling material still has good pressure resistance and tensile resistance.
The further preferred technical scheme is as follows: the desulfurization gypsum powder comprises high-strength desulfurization gypsum powder and common desulfurization gypsum powder.
The high-strength desulfurized gypsum powder has better compressive strength after being mixed with the common desulfurized gypsum powder, the high-strength desulfurized gypsum powder has higher density of semi-hydrated gypsum obtained according to dehydration, but the high-strength desulfurized gypsum powder has higher compressive strength and poorer fluidity, so the high-strength desulfurized gypsum powder needs to be mixed with the common desulfurized gypsum powder for common use.
The further preferred technical scheme is as follows: the ratio of the high-strength desulfurized gypsum powder to the common desulfurized gypsum powder in the desulfurized gypsum powder is 1 (0.5-2). The ratio of the high-strength desulfurized gypsum powder to the common desulfurized gypsum powder in the desulfurized gypsum powder is 1.
The further preferred technical scheme is as follows: the filler is one or a mixture of kaolin and heavy calcium carbonate, and the aggregate is composite lightweight aggregate.
A preparation method of the anti-cracking self-leveling material containing the silica sol comprises the step of adding water into the cement, the water reducing agent, the defoaming agent, the retarder, the rheological agent, the silica sol, the synergist, the crosslinking agent, the desulfurized gypsum powder, the filler and the aggregate, wherein the mass of the water accounts for 15-25% of the total mass.
Wherein the water can be used as common urban water supply or water with equal cleanliness.
The further preferred technical scheme is as follows: the water temperature is 5-40 ℃.
In order to prevent the self-leveling material from being damaged by early freezing, the temperature of the water to be added is required to be not lower than 5 ℃, the temperature of the self-leveling material is increased due to the exothermic reaction after the water is added, if the temperature of the added water is higher than 40 ℃, the mixing process is hindered according to the Lexhlet principle, and the temperature of the added water is preferably 20 ℃.
The invention has the advantages that:
1. adding silica sol into the self-leveling material for compounding and stirring, and improving the compression strength and the tensile strength of the self-leveling material by utilizing the characteristic of strong bonding force of the silica sol;
2. the synergist is added into the self-leveling material to be compounded with the silica sol, so that the speed of gradually polymerizing monomer silicic acid into high polymeric silica gel is slowed down, and the self-leveling material cannot crack due to too high shrinkage speed of the silica sol;
3. desulfurized gypsum powder is added into the self-leveling material and fixed on a film formed by silica sol polymerization, so that the sinking of fillers and aggregates in a slurry system is obviously inhibited;
4. the desulfurization gypsum powder is prepared by compounding high-strength desulfurization gypsum powder and common desulfurization gypsum powder, and has both compressive strength and fluidity.
Drawings
FIG. 1 is a table of the results of the cracking, compression and tensile properties tests from a flat surface of the invention.
FIG. 2 is a table showing the results of flatness, empty area, color difference, gloss and fullness tests of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, belong to the protection scope of the present invention.
Example 1
The anti-cracking self-leveling material containing the silica sol provided by the embodiment has the following formula:
100 parts of cement, namely 100 parts of ARDEX A35 quick-setting early strength cement;
5 parts of a water reducing agent, namely an FDN-4 retarding high-efficiency water reducing agent;
1 part of a defoaming agent, namely 1 part of PT-5230 polyether defoaming agent;
1 part of retarder, namely Master Finish EAC W1 surface retarder;
1 part of rheological agent, namely, 1 part of GARAMITE-7303 rheological auxiliary agent;
the silica sol is formed by mixing 5 parts of LS150 nano silica powder and 5 parts of sodium silicate (CAS: 106985-35-7, the purity is 99%);
a synergist which is 1 part of PAAS sodium polyacrylate;
1 part of cross-linking agent, namely TAC triallyl cyanurate;
18 parts of high-strength desulfurized gypsum powder, namely, zhongtian Jian and desulfurized gypsum powder;
18 parts of p160 gypsum mortar is adopted as common desulfurized gypsum powder;
10 parts of Translink445 kaolin serving as a filler;
aggregate, adopting 50 parts of LC10 composite lightweight aggregate;
mixing the materials, adding water with the temperature of 10 ℃, wherein the mass of the water accounts for 25% of the total mass, and performing compounding and stirring to obtain the self-leveling material.
Example 2
The anti-cracking self-leveling material containing the silica sol provided by the embodiment has the following formula:
100 parts of cement, namely 100 parts of ARDEX A35 quick-setting early strength cement;
a water reducing agent, namely, an FDN-4 retarding high-efficiency water reducing agent is adopted, and the weight is 4 parts;
0.8 part of PT-5230 polyether defoaming agent is adopted as the defoaming agent;
0.7 part of retarder, namely Master Finish EAC W1 surface retarder;
0.5 part of rheological agent, namely a GARAMITE-7303 rheological aid;
silica sol is formed by mixing 4 parts of LS150 nano silica powder and 4 parts of sodium silicate (CAS: 106985-35-7, the purity is 99%);
0.8 part of a synergist PAAS sodium polyacrylate;
0.7 part of a crosslinking agent, namely TAC triallyl cyanurate;
15 parts of high-strength desulfurized gypsum powder, namely Zhongtian jian and desulfurized gypsum powder;
15 parts of p160 gypsum mortar is adopted as common desulfurized gypsum powder;
8 parts of Translink445 kaolin serving as a filler;
40 portions of LC10 composite lightweight aggregate is adopted as aggregate;
mixing the materials, adding water with the temperature of 10 ℃, wherein the mass of the water accounts for 25% of the total mass, and performing compounding and stirring to obtain the self-leveling material.
Example 3
The anti-cracking self-leveling material containing the silica sol provided by the embodiment has the following formula:
100 parts of cement, namely 100 parts of ARDEX A35 quick-setting early strength cement;
2.4 parts of a water reducing agent, namely FDN-4 retarding superplasticizer;
0.5 part of a defoaming agent, namely a PT-5230 polyether defoaming agent;
0.5 part of retarder, namely Master Finish EAC W1 surface retarder;
0.3 part of rheological agent, namely, a GARAMITE-7303 rheological aid;
silica sol is formed by mixing 3.5 parts of LS150 nano silica powder and 3.5 parts of sodium silicate (CAS: 106985-35-7 purity 99%);
0.8 part of synergist PAAS sodium polyacrylate;
0.5 part of TAC triallyl cyanurate as a crosslinking agent;
10 parts of high-strength desulfurized gypsum powder, namely Zhongtian jian and desulfurized gypsum powder;
10 parts of p160 gypsum mortar is adopted as common desulfurized gypsum powder;
5 parts of CC 918 heavy calcium carbonate serving as a filler;
30 parts of LC10 composite lightweight aggregate serving as aggregate;
mixing the materials, adding water with the temperature of 10 ℃, wherein the mass of the water accounts for 25% of the total mass, and performing compounding and stirring to obtain the self-leveling material.
Comparative example 1
The formula of the comparative example is as follows:
100 parts of cement, namely 100 parts of ARDEX A35 quick-setting early strength cement;
5 parts of a water reducing agent, namely an FDN-4 retarding high-efficiency water reducing agent;
1 part of a defoaming agent, namely 1 part of PT-5230 polyether defoaming agent;
retarder, adopt Master Finish EAC W1 surface retarder, 1 part;
1 part of rheological agent, namely, 1 part of GARAMITE-7303 rheological auxiliary agent;
a synergist which is 1 part of PAAS sodium polyacrylate;
1 part of cross-linking agent, namely TAC triallyl cyanurate;
18 parts of high-strength desulfurized gypsum powder, namely, zhongtian Jian and desulfurized gypsum powder;
18 parts of p160 gypsum mortar is adopted as common desulfurized gypsum powder;
10 parts of Translink445 kaolin serving as a filler;
aggregate, adopting 50 parts of LC10 composite lightweight aggregate;
after the materials are mixed, water with the temperature of 10 ℃ is added, the mass of the water accounts for 25% of the total mass, and the self-leveling material is obtained after compounding and stirring.
Comparative example 2
The comparative formulation was as follows:
100 parts of cement, namely 100 parts of ARDEX A35 quick-setting early strength cement;
5 parts of a water reducing agent, namely an FDN-4 retarding high-efficiency water reducing agent;
1 part of a defoaming agent, namely 1 part of PT-5230 polyether defoaming agent;
retarder, adopt Master Finish EAC W1 surface retarder, 1 part;
1 part of rheological agent, namely 1 part of GARAMITE-7303 rheological auxiliary agent;
the silica sol is formed by mixing 5 parts of LS150 nano silica powder and 5 parts of sodium silicate (CAS: 106985-35-7, the purity is 99%);
1 part of a cross-linking agent, namely TAC triallyl cyanurate;
18 parts of high-strength desulfurized gypsum powder, namely, zhongtian Jian and desulfurized gypsum powder;
18 parts of p160 gypsum mortar is adopted as common desulfurized gypsum powder;
10 parts of Translink445 kaolin serving as a filler;
aggregate, adopting 50 parts of LC10 composite lightweight aggregate;
mixing the materials, adding water with the temperature of 10 ℃, wherein the mass of the water accounts for 25% of the total mass, and performing compounding and stirring to obtain the self-leveling material.
Comparative example 3
The formula of the comparative example is as follows:
100 parts of cement, namely 100 parts of ARDEX A35 quick-setting early strength cement;
5 parts of a water reducing agent, namely an FDN-4 retarding high-efficiency water reducing agent;
1 part of a defoaming agent, namely 1 part of PT-5230 polyether defoaming agent;
retarder, adopt Master Finish EAC W1 surface retarder, 1 part;
1 part of rheological agent, namely, 1 part of GARAMITE-7303 rheological auxiliary agent;
the silica sol is formed by mixing 5 parts of LS150 nano silica powder and 5 parts of sodium silicate (CAS: 106985-35-7, the purity is 99%);
a synergist which is 1 part of PAAS sodium polyacrylate;
1 part of cross-linking agent, namely TAC triallyl cyanurate;
10 parts of Translink445 kaolin serving as a filler;
aggregate, adopting 50 parts of LC10 composite lightweight aggregate;
mixing the materials, adding water with the temperature of 10 ℃, wherein the mass of the water accounts for 25% of the total mass, and performing compounding and stirring to obtain the self-leveling material.
Applicants tested the cracking, compression, and tensile properties of the free-flowing flat surface as shown in fig. 1, wherein:
compressive strength: the self-leveling material is divided into 24h, 7d and 28d, because the self-leveling material is gradually hardened by cementing action, the compressive strength is increased faster in the first 7d, the self-leveling material is increased slowly in the second 7d, the self-leveling material is basically stopped after 28d, the self-leveling material is standard strength, and the maximum tolerable pressure is tested according to JCT 985-2017 cement-based self-leveling mortar for the ground.
Breaking strength: the test standard is according to JCT 985-2017 cement-based self-leveling mortar for floors, except that a shearing force is applied on the self-leveling material.
Impact resistance: according to JCT 985-2017, cement-based self-leveling mortar for ground, the capability of the concrete for absorbing impact kinetic energy under the action of repeated bending impact load is tested.
In the present example, the compression strength, the flexural strength and the impact resistance test piece meet the following specifications:
1. a cube with the side length of 200 × 400 × 50 mm is used as a standard test piece;
2. the planeness tolerance of the pressure bearing surface of the test piece is not more than 0.0005d, and d is the side length;
3. the included angle between the adjacent surfaces of the test piece is 90 degrees, and the tolerance of the included angle is not more than 0.5 degree;
4. the tolerances of the side length, diameter and height dimensions of the test pieces must not exceed 1mm.
5. The number of the test pieces is 10, and the test results are averaged;
6. the maintenance age of the test piece is 28 days.
According to the test results, the mechanical properties of the self-leveling material prepared in the formula range all reach the national standard.
The comparative examples were observed to have a decrease in mechanical properties, but a substantially unchanged fluidity, where:
1. the comparative example 1 without silica sol has obviously reduced mechanical properties, and particularly has obvious cracking phenomenon under impact, which shows that the comparative example has cracking tendency under natural use state;
2. the comparative example 2 without the synergist has mechanical properties slightly better than those of the comparative example 1, but still has cracking phenomenon in an impact test;
3. the mechanical property of the comparative example 3 without the added desulfurized gypsum powder is slightly better than that of the comparative example 1, which shows that the silica sol plays a leading role in improving the mechanical property of the self-leveling material.
In addition, the self-leveling materials obtained in the embodiments 1 to 3 are detected according to the national standard "construction ground engineering construction quality acceptance criterion" GB50209-2010, and the results are shown in fig. 2, in which:
flatness: the percentage of the total area occupied by the defect free area from the leveled surface was observed vertically 1m away from the surface.
Empty area: flick test with a small hammer for 50m 2 The surface area of the self-leveling surface of the steel plate is large and small, and the hollowing noise is generated.
Color difference and glossiness: vertically observing from a distance of 1m away from the surface or testing by an instrument, wherein the area without macroscopic difference is vertically observed from the leveling surface and accounts for the percentage of the total area, and the color difference measured by a color difference meter cannot exceed 3.0; the difference in gloss cannot exceed 10 gloss units.
Fullness degree: the percentage of total area that is available to reflect light from the flow surface was observed.
Therefore, the self-leveling material prepared in the formula range can reach the use standard in appearance.
While the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various modifications can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. These are non-inventive modifications, which are intended to be protected by patent laws within the scope of the claims appended hereto.
Claims (8)
1. The anti-cracking self-leveling material containing the silica sol is characterized by comprising the following components in parts by mass:
50-100 parts of cement, 2.4-5 parts of water reducing agent, 0.5-1 part of defoaming agent, 0.5-1 part of retarder, 0.3-1 part of rheological agent, 3.5-5 parts of silica sol, 0.5-1 part of synergist, 0.5-1 part of cross-linking agent, 20-37 parts of desulfurized gypsum powder, 5-10 parts of filler and 30-50 parts of aggregate; the silica sol is prepared from a mixture of sodium silicate and nano silicon dioxide; the synergist comprises a polyacrylic acid salt.
2. The anti-cracking self-leveling material containing the silica sol as claimed in claim 1, wherein the components are mixed according to the following parts by mass: 50-100 parts of cement, 2.4-5 parts of water reducing agent, 0.5-1 part of defoaming agent, 0.5-1 part of retarder, 0.3-1 part of rheological agent, 4-5 parts of silica sol, 0.8-1 part of synergist, 0.5-1 part of cross-linking agent, 20-30 parts of desulfurized gypsum powder, 5-10 parts of filler and 30-50 parts of aggregate.
3. The silica sol-containing anti-cracking self-leveling material according to claim 1, wherein the desulfurized gypsum powder comprises high-strength desulfurized gypsum powder and common desulfurized gypsum powder.
4. The anti-cracking self-leveling material containing the silica sol as claimed in claim 3, wherein the mass ratio of the high-strength desulfurized gypsum powder to the common desulfurized gypsum powder in the desulfurized gypsum powder is 1 (0.5-2).
5. The silica sol containing anti-cracking self-leveling material according to claim 1, wherein the filler is one or a mixture of kaolin and ground calcium carbonate.
6. The silica sol containing crack resistant self-leveling material according to claim 1, wherein the aggregate is a composite lightweight aggregate.
7. The method for preparing the anti-cracking self-leveling material containing the silica sol as claimed in claim 1, wherein water is added into the cement, the water reducing agent, the defoaming agent, the retarder, the rheological agent, the silica sol, the synergist, the cross-linking agent, the desulfurized gypsum powder, the filler and the aggregate, and the water accounts for 15-25% of the total mass.
8. The method for preparing the silica sol-containing anti-cracking self-leveling material according to claim 7, wherein the water temperature is 5-40 ℃.
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