CN107935433B - High-performance concrete sustained-release and controlled-release in-water curing material and preparation method thereof - Google Patents
High-performance concrete sustained-release and controlled-release in-water curing material and preparation method thereof 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C04B20/10—Coating or impregnating
- C04B20/1051—Organo-metallic compounds; Organo-silicon compounds, e.g. bentone
Abstract
The invention provides a high-performance concrete sustained-release and controlled-release in-water curing material and a preparation method thereof, wherein the high-performance concrete sustained-release in-water curing material comprises the following raw materials: sodium alginate, xanthan gum, slaked lime, sodium acetate, sodium acrylate, 2-acrylamide-2-methylpropanesulfonic acid, a cross-linking agent and an initiator, and also comprises an organic metakaolin-diatomite-graphene oxide compound; the organic metakaolin-diatomite-graphene oxide compound comprises the following raw materials: metakaolin, diatomite, graphene oxide and a silane coupling agent. The invention can obviously improve the compressive strength of the concrete, and the compressive strength of the concrete 28d is more than 120 percent of the reference concrete strength. The fluidity of the concrete is also obviously improved after 60 min. In addition, the self-shrinkage of the concrete can be greatly reduced. Effectively solves the problems that the water release rate of the existing internal curing material is difficult to control and the concrete strength can be reduced.
Description
Technical Field
The invention belongs to the field of building materials, relates to a concrete internal curing agent, and particularly relates to a high-performance concrete controlled-release water internal curing material and a preparation method thereof.
Background
The high-performance concrete has excellent mechanical property, so that the bearing capacity of the member can be greatly improved, or the size of the section of the member is reduced when the bearing capacity is constant, thereby saving raw materials and improving the aesthetic effect of the building. Therefore, the high-performance concrete is widely applied to projects such as high-rise buildings, large-span bridges and the like. The high-performance concrete has the greatest characteristics of low water-cement ratio and easy occurrence of larger deformation of a concrete structure due to self-contraction, thereby causing generation and cracking of internal cracks of the high-strength concrete and reducing the mechanical property and durability of the concrete. Therefore, certain maintenance measures are required to control the water evaporation and promote maximum hydration of the cement. At present, the curing technology used in most concrete projects in China is an external curing technology. The technology is curing technology such as covering a wet straw bag, a plastic film and directly spraying water on the surface layer of concrete. The external curing technology from outside to inside consumes a large amount of manpower and financial resources, and particularly for the high-performance concrete with low water-cement ratio as a typical characteristic at present, the structure is relatively compact, external moisture is difficult to reach the inside of the concrete, so that the curing is uneven, and the durability of the concrete in the using process is reduced. The main reason for the reduction of the durability of the concrete is that the external curing method cannot effectively relieve the self-shrinkage of the concrete, and micro cracks are easily generated in the concrete.
In order to effectively improve the shrinkage cracking problem of concrete in the curing process and improve the strength and durability of concrete, the internal curing technology is becoming a research hotspot at present. The internal curing of concrete means that light aggregate is pre-soaked or a high polymer material with water absorption is added as an internal curing material in the mixing process of the concrete. The action principle of the method is mainly that a part of water is pre-stored in the concrete, so that the humidity distribution in the concrete is adjusted to a certain degree, the water requirement of the concrete in the hydration process is guaranteed, the secondary hydration of cement and mineral admixtures is promoted, the concrete is more compact, the strength of the concrete is improved, the cracking of the concrete is reduced, and the durability of the concrete is improved.
At present, the most used pre-impregnated lightweight aggregates at home and abroad are expansive clay, zeolite, pumice and the like. In order to improve the curing effect, a large amount of light aggregate is usually required to be added, the self-shrinkage of the concrete is greatly reduced, but the strength of the concrete is reduced due to the large amount of the light aggregate, and the strength of the concrete with irregular water absorption of the light aggregate has great difference. Among them, SAP (super absorbent polymer) is the most important object, and SAP as a curing agent in concrete not only promotes hydration of cement but also reduces cracking due to shrinkage. However, because of the limited current technologies, the incorporation of SAP has a great controversial effect on the strength of concrete, and in addition, the incorporation of SAP deteriorates the workability of concrete and does not effectively control the water release rate during the hydration of cement concrete.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a high-performance concrete sustained and controlled release water internal curing material and a preparation method thereof, and solves the technical problems that the water release rate of the existing internal curing material is difficult to control and the concrete strength can be reduced.
In order to solve the technical problem, the application adopts the following technical scheme:
a high-performance concrete sustained-release and controlled-release in-water curing material comprises the following raw materials: sodium alginate, xanthan gum, slaked lime, sodium acetate, sodium acrylate, 2-acrylamide-2-methylpropanesulfonic acid, a cross-linking agent and an initiator, and also comprises an organic metakaolin-diatomite-graphene oxide compound;
the organic metakaolin-diatomite-graphene oxide compound comprises the following raw materials: metakaolin, diatomite, graphene oxide and a silane coupling agent;
the preparation process of the organic metakaolin-diatomite-graphene oxide compound comprises the following steps:
the method comprises the following steps: placing metakaolin, diatomite and graphene oxide in a container, uniformly mixing, preparing a suspension with the weight portion of 3%, and performing ultrasonic dispersion for 10min to obtain a suspension A;
step two: adding a silane coupling agent into a mixed solvent with the volume ratio of ethanol to water being 1:1, and preparing coupling agent hydrolysate B with the mass concentration of 3%;
step three: mixing the suspension A and the coupling agent hydrolysate B, performing ultrasonic dispersion uniformly, and performing mechanical stirring reaction for 3-5 hours at a constant temperature of 60 ℃ to obtain a mixed solution; and after cooling, washing the organic metakaolin-diatomite-graphene oxide composite with absolute ethyl alcohol for more than 2 times, performing suction filtration, drying, grinding and sieving with a 300-mesh sieve to obtain the organic metakaolin-diatomite-graphene oxide composite.
The invention also has the following distinguishing technical characteristics:
specifically, the feed is prepared from the following raw materials in parts by weight: 15 to 20 percent of metakaolin, 10 to 13 percent of diatomite, 8 to 10 percent of graphene oxide, 6 to 8 percent of silane coupling agent, 3 to 4 percent of sodium alginate, 4 to 6 percent of xanthan gum, 2 to 4 percent of slaked lime, 0.95 to 4.42 percent of sodium acetate, 25 to 30 percent of sodium acrylate, 10 to 15 percent of 2-acrylamide-2-methylpropanesulfonic acid, 0.05 to 0.08 percent of cross-linking agent and 0.5 to 1 percent of initiator, wherein the sum of the weight percentages of the raw materials is 100 percent.
Preferably, the feed is prepared from the following raw materials in parts by weight: 17.5% of metakaolin, 12% of diatomite, 9% of graphene oxide, 7% of silane coupling agent, 3.5% of sodium alginate, 5% of xanthan gum, 3% of slaked lime, 2.74% of sodium acetate, 27% of sodium acrylate, 12.5% of 2-acrylamide-2-methylpropanesulfonic acid, 0.06% of cross-linking agent and 0.7% of initiator.
Specifically, the particle size of the metakaolin is 1500 meshes, and SiO in the metakaolin is2The content of (A) is 40-60%.
Specifically, the particle size of the diatomite is 300 meshes, and SiO in the diatomite280-90% of (B), Fe2O3The content is less than or equal to 1.2 percent.
Specifically, the silane coupling agent is 3-aminopropane triethoxysilane, 3-aminopropane trimethoxysilane or 3-aminopropane ethoxysilane.
Specifically, the particle size of the slaked lime is 325 meshes, and Ca (OH) in the slaked lime2The content of (A) is more than or equal to 90 percent.
Specifically, the cross-linking agent is prepared from polyvinyl alcohol and glycerol according to the weight ratio of 1: 1.
Specifically, the initiator is ceric nitrate amine.
The preparation method of the high-performance concrete sustained and controlled release in-water curing material comprises the following steps:
the method comprises the following steps: weighing the raw materials according to the proportion for later use;
step two: placing metakaolin, diatomite and graphene oxide in a container, uniformly mixing, preparing a suspension with the weight portion of 3%, and performing ultrasonic dispersion for 10min to obtain a suspension A;
step three: adding a silane coupling agent into a mixed solvent with the volume ratio of ethanol to water being 1:1, and preparing coupling agent hydrolysate B with the mass concentration of 3%;
step four: mixing the suspension A and the coupling agent hydrolysate B, performing ultrasonic dispersion uniformly, and performing mechanical stirring reaction for 3-5 hours at a constant temperature of 60 ℃ to obtain a mixed solution; after cooling, washing the composite with absolute ethyl alcohol for more than 2 times, carrying out suction filtration, drying, grinding, and sieving with a 300-mesh sieve to obtain an organic metakaolin-diatomite-graphene oxide composite, marking as a composite C, and then adding water to the composite C to prepare a suspension D with the weight part of 3%;
step five: adding water into sodium alginate and xanthan gum to prepare a solution with the mass concentration of 3%, and stirring for 30min to obtain a solution E;
step six: adding water into slaked lime to prepare saturated lime water solution; adding sodium acetate, and uniformly mixing to obtain a solution F;
step seven: uniformly mixing sodium acrylate and 2-acrylamide-2-methylpropanesulfonic acid, adding the solution F, and cooling to room temperature; adding the solution E, and stirring until the solution E is fully dissolved to obtain a mixture G;
step eight: uniformly mixing the suspension D prepared in the step four with the mixture G, placing the container in a water bath at 70 ℃, adding a cross-linking agent and an initiator in the process of continuously stirring, controlling the temperature in the whole process to be between 60 and 80 ℃, and reacting for 10 hours to obtain a compound H;
step nine: and taking out the compound H, fully drying, and crushing to obtain the high-performance concrete sustained-release and controlled-release in-water curing material with the particle size of 60-100 meshes.
Compared with the prior art, the invention has the beneficial technical effects that:
the water storage effect of the organic metakaolin-diatomite-graphene oxide compound C in the internal curing material can adjust the humidity distribution in the concrete to a certain extent, so that the water demand of the concrete in the hydration process is ensured, and the secondary hydration of cement and mineral admixtures is promoted.
The organic metakaolin-diatomite-graphene oxide compound C not only can well overcome the defect that the water release rate of the internal curing material is difficult to control, but also can fully utilize the filling effect and the volcanic ash effect of metakaolin to fill the capillary pores of a concrete material and the pores remained after the organic polymer compound C loses water, so that the concrete is more compact, the strength of the concrete is obviously improved, the cracking of the concrete is reduced, and the durability of the concrete is improved.
The graphene oxide component can obviously improve the surface morphology of the internal curing material, improve the working performance of the mixed concrete, and increase the thermal stability and water retention capacity of the curing material. The internal curing material prepared by the invention greatly contributes to the strength, durability and service life of concrete.
The present invention is explained in further detail with reference to examples below.
Detailed Description
The xanthan gum component in the invention has strong hydrophilicity, and can obviously improve the compounding degree between inorganic components and organic macromolecules, so that the prepared internal curing material has great contribution to the strength, durability and service life of cement concrete.
The preparation method of the high-performance concrete sustained-release and controlled-release in-water curing material provided by the invention comprises the steps of firstly carrying out organic modification on metakaolin, diatomite and graphene oxide materials by using a silane coupling agent; the silane coupling agent is firstly decomposed under the action of moisture, isolated hydroxyl groups exist on the surface of the diatomite, and the hydrolyzed silane coupling agent can be in hydrogen bond combination with the hydroxyl groups on the surface of the inorganic substance, and is further heated and dried to generate dehydration reaction with the surface of the inorganic substance. Finally, the surface of the inorganic substance contains a silane coupling agent covering layer, so that the modified metakaolin, diatomite and graphene oxide material form an organic matrix-silane coupling agent-inorganic substance compound, the hydrophilicity of the compound is reduced, and the lipophilicity of the compound is increased; after the xanthan gum and the sodium alginate are mixed, the xanthan gum can well provide a skeleton of a cross-linked network after in-situ graft polymerization on the sodium alginate, has extremely strong hydrophilicity, integrates thickening, suspending, emulsifying and stabilizing, can remarkably improve the hydrophilicity of an organic polymer, reduces the lipophilicity of the organic polymer, and remarkably improves the compounding degree of the organic polymer.
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
Example 1:
the embodiment provides a high-performance concrete sustained and controlled release in-water curing material which is prepared from the following raw materials in parts by weight: 17.5% of metakaolin, 12% of diatomite, 9% of graphene oxide, 7% of silane coupling agent, 3.5% of sodium alginate, 5% of xanthan gum, 3% of slaked lime, 2.74% of sodium acetate, 27% of sodium acrylate, 12.5% of 2-acrylamide-2-methylpropanesulfonic acid, 0.06% of cross-linking agent and 0.7% of initiator.
In this embodiment:
the particle size of the metakaolin is 1500 meshes, and SiO in the metakaolin2The content of (A) is 40-60%.
The particle size of the diatomite is 300 meshes, and SiO in the diatomite280-90% of (B), Fe2O3The content is less than or equal to 1.2 percent.
The silane coupling agent is 3-aminopropane triethoxysilane.
The particle size of the slaked lime is 325 meshes, and Ca (OH) in the slaked lime2The content of (A) is more than or equal to 90 percent.
The cross-linking agent is prepared from polyvinyl alcohol and glycerol according to the weight ratio of 1: 1. The polyvinyl alcohol is polyvinyl alcohol commonly used in the field, and preferably the polyvinyl alcohol with the number average molecular weight of 40000-50000.
The initiator is ceric nitrate amine.
The preparation method of the high-performance concrete sustained-release and controlled-release in-water curing material of the embodiment comprises the following steps:
the method comprises the following steps: weighing the raw materials according to the proportion for later use;
step two: placing metakaolin, diatomite and graphene oxide in a container, uniformly mixing, preparing a suspension with the weight portion of 3%, and performing ultrasonic dispersion for 10min to obtain a suspension A;
step three: adding a silane coupling agent into a mixed solvent with the volume ratio of ethanol to water being 1:1, and preparing coupling agent hydrolysate B with the mass concentration of 3%;
step four: mixing the suspension A and the coupling agent hydrolysate B, performing ultrasonic dispersion uniformly, and performing mechanical stirring reaction for 3-5 hours at a constant temperature of 60 ℃ to obtain a mixed solution; after cooling, washing the composite with absolute ethyl alcohol for more than 2 times, carrying out suction filtration, drying, grinding, and sieving with a 300-mesh sieve to obtain an organic metakaolin-diatomite-graphene oxide composite, marking as a composite C, and then adding water to the composite C to prepare a suspension D with the weight part of 3%;
step five: adding water into sodium alginate and xanthan gum to prepare a solution with the mass concentration of 3%, and stirring for 30min to obtain a solution E;
step six: adding water into slaked lime to prepare saturated lime water solution; adding sodium acetate, and uniformly mixing to obtain a solution F;
step seven: uniformly mixing sodium acrylate and 2-acrylamide-2-methylpropanesulfonic acid, adding the solution F, and cooling to room temperature; adding the solution E, and stirring until the solution E is fully dissolved to obtain a mixture G;
step eight: uniformly mixing the suspension D prepared in the step four with the mixture G, placing the container in a water bath at 70 ℃, adding a cross-linking agent and an initiator in the process of continuously stirring, controlling the temperature in the whole process to be between 60 and 80 ℃, and reacting for 10 hours to obtain a compound H;
step nine: and taking out the compound H, fully drying, and crushing to obtain the high-performance concrete sustained-release and controlled-release in-water curing material with the particle size of 60-100 meshes.
And (3) performance testing: in order to verify that the internal curing material prepared by the embodiment has good performance, the internal curing material prepared by the embodiment and cement are added into mixing equipment together for mixing, the weight mixing amount is 0.3% of the weight of the cement, and the obtained concrete is subjected to performance test, wherein the test comprises a compression resistance test, a fluidity test and a self-contraction test.
The results of the performance test of this example are shown in table 1.
Example 2:
the embodiment provides a high-performance concrete sustained and controlled release in-water curing material which is prepared from the following raw materials in parts by weight: 17% of metakaolin, 11% of diatomite, 9.5% of graphene oxide, 7.5% of silane coupling agent, 3.5% of sodium alginate, 5.5% of xanthan gum, 2.5% of slaked lime, 1.63% of sodium acetate, 28% of sodium acrylate, 13% of 2-acrylamide-2-methylpropanesulfonic acid, 0.07% of cross-linking agent and 0.8% of initiator.
The kind and amount of each raw material in this example were the same as those in example 1.
The preparation method of the high-performance concrete controlled-release in-water curing material of the embodiment is basically the same as that of the embodiment 1.
The performance test procedure of this example is substantially the same as that of example 1, the amount of the internal curing material is 0.5% of the amount of the cement, and the performance test results of this example are shown in table 1.
Example 3:
the embodiment provides a high-performance concrete sustained and controlled release in-water curing material which is prepared from the following raw materials in parts by weight: 20% of metakaolin, 10% of diatomite, 8% of graphene oxide, 6% of silane coupling agent, 4% of sodium alginate, 6% of xanthan gum, 4% of slaked lime, 0.95% of sodium acetate, 30% of sodium acrylate, 10% of 2-acrylamide-2-methylpropanesulfonic acid, 0.05% of crosslinking agent and 1% of initiator.
The kind and amount of each raw material in this example were the same as those in example 1.
The preparation method of the high-performance concrete controlled-release in-water curing material of the embodiment is basically the same as that of the embodiment 1.
The performance test procedure of this example is substantially the same as that of example 1, and the performance test results of this example are shown in table 1.
Example 4:
the embodiment provides a high-performance concrete sustained and controlled release in-water curing material which is prepared from the following raw materials in parts by weight: 15% of metakaolin, 13% of diatomite, 10% of graphene oxide, 8% of silane coupling agent, 3% of sodium alginate, 4% of xanthan gum, 2% of slaked lime, 4.42% of sodium acetate, 25% of sodium acrylate, 15% of 2-acrylamide-2-methylpropanesulfonic acid, 0.08% of crosslinking agent and 0.5% of initiator.
The kind and amount of each raw material in this example were the same as those in example 1.
The preparation method of the high-performance concrete controlled-release in-water curing material of the embodiment is basically the same as that of the embodiment 1.
The performance test procedure of this example is substantially the same as that of example 1, and the performance test results of this example are shown in table 1.
In the above embodiment, 3-aminopropane trimethoxy silane or 3-aminopropane ethoxy silane can be used as the silane coupling agent, and the effect is basically the same.
Comparative example 1:
the comparative example shows a concrete controlled-release water internal curing material which is basically the same as that in example 1, except that no organic metakaolin-diatomite-graphene oxide compound is doped in the comparative example, and the component contents of other raw materials are proportionally expanded according to the proportioning relation in example 1, so that the sum of the weight parts of the raw materials is 100%.
The kinds and amounts of the respective raw materials in this comparative example were required to be the same as those in example 1.
The preparation method of the concrete controlled-release in-water curing material of the comparative example is basically the same as that of example 1.
The procedure of the performance test of this comparative example was substantially the same as that of example 1, and the results of the performance test of this comparative example are shown in table 1.
TABLE 1 results of the internal curing material performance tests (all are the changes relative to the reference concrete)
As can be seen from Table 1:
from the comparison of examples 1 to 4, it can be seen that: the internal curing materials in the embodiments 1-4 can obviously improve the compressive strength of the concrete, and the 28d compressive strength in the four groups of examples is more than 120% of the standard concrete strength. The fluidity of the concrete is also obviously improved after 60 min. In addition, the internal curing materials of examples 1 to 4 can reduce the self-shrinkage of concrete to a large extent. Among them, the inner curing material of example 1 is the best in overall performance.
From a comparison of example 1 and comparative example 1, it can be seen that: compared with the high-performance concrete sustained and controlled release in-water curing material which is not doped with the organic metakaolin-diatomite-graphene oxide compound, the high-performance concrete sustained and controlled release in-water curing material provided by the embodiment 1 has the advantages that when the high-performance concrete sustained and controlled release in-water curing material is used as a concrete in-water curing agent, the compressive strength of 7d and 28d of concrete is improved, in addition, the self-shrinkage of concrete is obviously reduced while the workability of concrete is improved, and therefore the comprehensive performance is more excellent.
Claims (9)
1. The high-performance concrete sustained and controlled release in-water curing material is characterized by being prepared from the following raw materials in parts by weight: 15 to 20 percent of metakaolin, 10 to 13 percent of diatomite, 8 to 10 percent of graphene oxide, 6 to 8 percent of silane coupling agent, 3 to 4 percent of sodium alginate, 4 to 6 percent of xanthan gum, 2 to 4 percent of slaked lime, 0.95 to 4.42 percent of sodium acetate, 25 to 30 percent of sodium acrylate, 10 to 15 percent of 2-acrylamide-2-methylpropanesulfonic acid, 0.05 to 0.08 percent of cross-linking agent and 0.5 to 1 percent of initiator, wherein the sum of the weight percentages of the raw materials is 100 percent;
the preparation method comprises the following steps of preparing an organic metakaolin-diatomite-graphene oxide compound from metakaolin, diatomite, graphene oxide and a silane coupling agent, wherein the preparation process of the organic metakaolin-diatomite-graphene oxide compound comprises the following steps:
the method comprises the following steps: placing metakaolin, diatomite and graphene oxide in a container, uniformly mixing, preparing a suspension with the weight percentage of 3%, and performing ultrasonic dispersion for 10min to obtain a suspension A;
step two: adding a silane coupling agent into a mixed solvent with the volume ratio of ethanol to water being 1:1, and preparing coupling agent hydrolysate B with the mass concentration of 3%;
step three: mixing the suspension A and the coupling agent hydrolysate B, performing ultrasonic dispersion uniformly, and performing mechanical stirring reaction for 3-5 hours at a constant temperature of 60 ℃ to obtain a mixed solution; and after cooling, washing the organic metakaolin-diatomite-graphene oxide composite with absolute ethyl alcohol for more than 2 times, performing suction filtration, drying, grinding and sieving with a 300-mesh sieve to obtain the organic metakaolin-diatomite-graphene oxide composite.
2. The high-performance concrete sustained and controlled release in-water curing material as claimed in claim 1, which is prepared from the following raw materials in parts by weight: 17.5% of metakaolin, 12% of diatomite, 9% of graphene oxide, 7% of silane coupling agent, 3.5% of sodium alginate, 5% of xanthan gum, 3% of slaked lime, 2.74% of sodium acetate, 27% of sodium acrylate, 12.5% of 2-acrylamide-2-methylpropanesulfonic acid, 0.06% of cross-linking agent and 0.7% of initiator.
3. The high performance concrete sustained and controlled release in-water curing material of claim 1, wherein the metakaolin has a particle size of 1500 meshes and SiO in the metakaolin2The content of (A) is 40-60%.
4. The high performance concrete sustained and controlled release in-water curing material of claim 1, wherein the diatomaceous earth has a particle size of 300 mesh and SiO in the diatomaceous earth280-90% of (B), Fe2O3The content is less than or equal to 1.2 percent.
5. The high performance concrete sustained and controlled release in-water curing material of claim 1, wherein the silane coupling agent is 3-aminopropane triethoxysilane, 3-aminopropane trimethoxysilane or 3-aminopropane ethoxysilane.
6. The high performance concrete sustained and controlled release in-water curing material of claim 1, wherein the particle size of the slaked lime is 325 mesh, and Ca (OH) in the slaked lime2The content of (A) is more than or equal to 90 percent.
7. The high performance concrete sustained and controlled release in-water curing material of claim 1, wherein the cross-linking agent is prepared from polyvinyl alcohol and glycerol in a weight ratio of 1: 1.
8. The high performance concrete sustained and controlled release in-water curing material of claim 1, wherein the initiator is ceric amine nitrate.
9. A method for preparing the high-performance concrete sustained and controlled release water internal curing material as claimed in any one of claims 1 to 8, which is carried out according to the following steps:
the method comprises the following steps: weighing the raw materials according to the proportion for later use;
step two: placing metakaolin, diatomite and graphene oxide in a container, uniformly mixing, preparing a suspension with the weight percentage of 3%, and performing ultrasonic dispersion for 10min to obtain a suspension A;
step three: adding a silane coupling agent into a mixed solvent with the volume ratio of ethanol to water being 1:1, and preparing coupling agent hydrolysate B with the mass concentration of 3%;
step four: mixing the suspension A and the coupling agent hydrolysate B, performing ultrasonic dispersion uniformly, and performing mechanical stirring reaction for 3-5 hours at a constant temperature of 60 ℃ to obtain a mixed solution; after cooling, washing the composite with absolute ethyl alcohol for more than 2 times, carrying out suction filtration, drying, grinding, and sieving with a 300-mesh sieve to obtain an organic metakaolin-diatomite-graphene oxide composite, marking as a composite C, and then adding water into the composite C to prepare a suspension D with the weight fraction of 3%;
step five: adding water into sodium alginate and xanthan gum to prepare a solution with the mass concentration of 3%, and stirring for 30min to obtain a solution E;
step six: adding water into slaked lime to prepare saturated lime water solution; adding sodium acetate, and uniformly mixing to obtain a solution F;
step seven: uniformly mixing sodium acrylate and 2-acrylamide-2-methylpropanesulfonic acid, adding the solution F, and cooling to room temperature; adding the solution E, and stirring until the solution E is fully dissolved to obtain a mixture G;
step eight: uniformly mixing the suspension D prepared in the step four with the mixture G, placing the container in a water bath at 70 ℃, adding a cross-linking agent and an initiator in the process of continuously stirring, controlling the temperature in the whole process to be between 60 and 80 ℃, and reacting for 10 hours to obtain a compound H;
step nine: and taking out the compound H, fully drying, and crushing to obtain the high-performance concrete sustained-release and controlled-release in-water curing material with the particle size of 60-100 meshes.
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| KR20100093183A (en) * | 2009-02-16 | 2010-08-25 | 안학현 | Polymer color concreteand and pavement method of thereof |
| CN103496877A (en) * | 2013-09-16 | 2014-01-08 | 深圳大学 | Concrete internal curing agent as well as preparation method and using method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100093183A (en) * | 2009-02-16 | 2010-08-25 | 안학현 | Polymer color concreteand and pavement method of thereof |
| CN103496877A (en) * | 2013-09-16 | 2014-01-08 | 深圳大学 | Concrete internal curing agent as well as preparation method and using method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 天然高分子系高吸水树脂及其改性水性聚氨酯的制备与性能研究;陈颖;《中国优秀硕士学位论文全文数据库 工程科技I辑》;20140315(第03期);B016-126页 * |
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