CN116239333B - Production process of antifreeze concrete additive - Google Patents
Production process of antifreeze concrete additive Download PDFInfo
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- CN116239333B CN116239333B CN202310528753.9A CN202310528753A CN116239333B CN 116239333 B CN116239333 B CN 116239333B CN 202310528753 A CN202310528753 A CN 202310528753A CN 116239333 B CN116239333 B CN 116239333B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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
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- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
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- 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
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- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0625—Polyalkenes, e.g. polyethylene
- C04B16/0633—Polypropylene
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- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/02—Alcohols; Phenols; Ethers
- C04B24/026—Fatty alcohols
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- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
- C04B24/42—Organo-silicon compounds
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- 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
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
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- 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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Abstract
The invention relates to the technical field of concrete additives, and provides a production process of an antifreeze concrete additive, which takes ethylene glycol monovinyl polyethylene glycol ether and acrylic acid as raw materials, gamma-methacryloxypropyl trimethoxy silane as a modifier, and prepares a polycarboxylic acid water reducer through polymerization reaction of the ethylene glycol monovinyl polyethylene glycol ether, so that the acid and alkali corrosion resistance of concrete can be improved to a certain extent, and the fluidity of the concrete can be improved; and secondly, the nano silicon dioxide with the glycerol attached to the surface is added, so that the nano silicon dioxide can modify the fly ash and mineral powder in the concrete, and the fly ash and mineral powder have the capability of resisting chloride ion penetration, thereby enhancing the chlorine salt corrosion resistance of the concrete.
Description
Technical Field
The invention relates to the technical field of concrete additives, in particular to a production process of an antifreeze concrete additive.
Background
The development of concrete has undergone a lengthy history of evolution, has gradually evolved into modern multifunctional concrete, and has played an irreplaceable role in recent modern civil engineering. The concrete has the advantages of high compressive strength, low cost and excellent performance, but also has the disadvantages of low tensile strength, poor cracking resistance, small toughness and the like, and limits the potential development of the concrete. And the concrete is inevitably damaged by chemical erosion, load damage, freeze thawing damage and the like due to the influence of the service environment. The freeze thawing damage is the most common damage of concrete, especially in northern areas of China, concrete buildings are in cold environment for a long time, and the freeze thawing damage is more serious, so that the improvement of the frost resistance of the concrete is very important.
Many types of antifreeze additives appear on the market at present, the antifreeze property of the antifreeze additive is improved by adding substances with special properties into concrete, but the components of the existing antifreeze additive are single, the antifreeze property of the concrete is changed only by the special properties of the antifreeze additive after the antifreeze additive is added into the concrete, and the antifreeze additive has the antifreeze property, and if the additive with the antifreeze effect and the additive with other properties can be cooperated, the performance of the concrete is improved from different aspects, the market prospect of the concrete can be greatly expanded.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects existing in the prior art, the invention provides a production process of an antifreezing concrete additive, and aims to improve the antifreezing performance and mechanical property of concrete by the produced additive, thereby improving the market application value of the concrete.
Technical proposal
In order to achieve the above purpose, the invention is realized by the following technical scheme:
a process for producing an antifreeze concrete admixture, comprising the steps of:
s1, according to 1:5, pouring nano silicon dioxide and glycerol into a container for mixing and stirring, placing the container at a frequency of 26-28kHz for ultrasonic dispersion for 8-10min after mixing and stirring, draining and drying the container to constant weight after ultrasonic dispersion, crushing the container to 200 meshes, and obtaining the anti-freezing silicon dioxide;
s2, acrylic acid and deionized water are mixed according to the following ratio of 1:6, stirring for 10min after mixing, recording as an acrylic acid aqueous solution, and mixing gamma-methacryloxypropyl trimethoxysilane with deionized water according to a ratio of 1:10, stirring for 10min after mixing, adding antifreeze silicon dioxide accounting for 20% of the total amount, and continuing stirring for 5min, wherein the obtained mixture is marked as a modified mixture;
s3, weighing a certain amount of ethylene glycol monovinyl polyethylene glycol ether, pouring the ethylene glycol monovinyl polyethylene glycol ether into a three-neck flask with a stirrer and a thermometer, adding deionized water with the mass of 5-8 times of the ethylene glycol monovinyl polyethylene glycol ether, stirring until the ethylene glycol monovinyl polyethylene glycol ether is completely dissolved, adding hydrogen peroxide with the mass of 3 times of the ethylene glycol monovinyl polyethylene glycol ether, stirring for 5min, uniformly dropwise adding an acrylic acid aqueous solution and a modified mixture, preserving heat for 30min at the temperature of 40 ℃ after the dropwise adding is finished, then dropwise adding a sodium hydroxide aqueous solution, regulating the pH value to 6-7, and obtaining the antifreeze modified polycarboxylate water reducer;
s4, according to the following steps of 1:3, pouring the plastic steel fiber and absolute ethyl alcohol into a container according to the feed liquid ratio, mixing and stirring at the stirring speed of 300-400r/min, draining water after stirring for 10min, and drying at the temperature of 45 ℃ to constant weight, thus obtaining the anti-freezing modified plastic steel fiber;
s5, weighing 8-10 parts of antifreeze silicon dioxide, 18-22 parts of antifreeze modified polycarboxylate water reducer, 12-15 parts of antifreeze modified plastic steel fiber, 25-30 parts of complex type additive mixture, 38-40 parts of antifreeze component and 50 parts of deionized water for standby according to parts by weight;
s6, mixing the antifreeze modified polycarboxylate water reducer, the complex type additive mixture, the antifreeze component and deionized water in parts by weight to obtain a liquid component, pouring the antifreeze silica and the antifreeze modified plastic steel fiber in parts by weight into a planetary ball mill for grinding for 5min, and mixing with the liquid component to obtain the antifreeze concrete additive after uniform mixing.
Further, the stirring speed of the mixing and stirring in the step S1 is 300-500r/min, the stirring time is 10min, and the drying temperature in the step S1 is 55 ℃.
Further, the stirring speed in the step S2 is 400-500r/min.
Further, the dropping speed in S3 is 1-2 drops/S, and the mass fraction of the sodium hydroxide aqueous solution in S3 is 20%.
Still further, the molar ratio of acrylic acid, gamma-methacryloxypropyl trimethoxysilane and ethylene glycol monovinyl polyethylene glycol ether in S2 and S3 is 16:1:4.
further, the preparation method of the complex additive mixture in S5 comprises the following steps:
step 1, weighing 7 parts by weight of maleic anhydride and 100 parts by weight of deionized water, pouring the mixture into a three-neck flask with a stirrer, a thermometer and a condensation reflux device, and stirring at a stirring speed of 500r/min until the maleic anhydride is completely dissolved;
step 2, heating the three-neck flask in the step 1 to 90 ℃ in a water bath, adding 3 parts by weight of hydrogen peroxide aqueous solution, and reacting for 4 hours at a constant temperature under a stirring speed of 300 r/min;
step 3, adding 55 parts by weight of sodium hydroxide solution with the concentration of 0.1mol/L into the system in the step 2, reacting for 1h under the stirring condition of the original stirring speed, removing the solvent by a rotary evaporator after the reaction, and drying for 2-3h at the temperature of 45-50 ℃;
step 4, according to 1:5, dissolving the product obtained in the step 3 into deionized water, and stirring for 10min at a stirring speed of 300r/min to obtain the complex additive mixture.
Further, the volume concentration of the aqueous hydrogen oxide solution in the step 1 is 30%.
Further, the preparation method of the antifreeze component in the step S5 comprises the following steps: according to 1:2:1, mixing ethylene glycol, propylene glycol and methanol according to the volume ratio, and stirring for 10min at the stirring speed of 600r/min to obtain the antifreezing agent component.
Advantageous effects
The invention provides a production process of an antifreeze concrete additive, which has the following beneficial effects compared with the prior art:
1. according to the invention, ethylene glycol monovinyl polyethylene glycol ether and acrylic acid are used as raw materials, gamma-methacryloxypropyl trimethoxy silane is used as a modifier, and the polycarboxylic acid water reducer is prepared through the polymerization reaction of the ethylene glycol monovinyl polyethylene glycol ether, so that the acid and alkali corrosion resistance of concrete can be improved to a certain extent, and the fluidity of the concrete can be improved; and secondly, the nano silicon dioxide with the glycerol attached to the surface is added, so that the nano silicon dioxide can modify the fly ash and mineral powder in the concrete, and the fly ash and mineral powder have the capability of resisting chloride ion permeation, thereby further enhancing the chlorine salt corrosion resistance of the concrete.
2. According to the invention, the mechanical property of the concrete can be improved by adding the plastic steel fibers, the compressive strength of the concrete can be improved to a certain extent by adding the plastic steel fibers, and the plastic steel fibers are soaked in absolute ethyl alcohol and then dried, so that the surface of the plastic steel fibers is attached with the ethyl alcohol, and the ethyl alcohol is more uniformly dispersed in the additive to be combined with the concrete; and secondly, the antifreeze component is added into the antifreeze concrete additive, so that the antifreeze concrete additive can improve the antifreeze performance of the concrete land, and the service life of the concrete is prolonged to a certain extent.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention is further described below with reference to examples.
Example 1
The production process of the antifreeze concrete additive comprises the following steps of:
s1, according to 1:5, pouring nano silicon dioxide and glycerol into a container for mixing and stirring, placing the container at a frequency of 26kHz for ultrasonic dispersion for 8min after mixing and stirring, draining and drying the container to constant weight after ultrasonic dispersion, crushing the container to 200 meshes, and obtaining the anti-freezing silicon dioxide;
s2, acrylic acid and deionized water are mixed according to the following ratio of 1:6, stirring for 10min after mixing, recording as an acrylic acid aqueous solution, and mixing gamma-methacryloxypropyl trimethoxysilane with deionized water according to a ratio of 1:10, stirring for 10min after mixing, adding antifreeze silicon dioxide accounting for 20% of the total amount, and continuing stirring for 5min, wherein the obtained mixture is marked as a modified mixture;
s3, weighing a certain amount of ethylene glycol monovinyl polyethylene glycol ether, pouring the ethylene glycol monovinyl polyethylene glycol ether into a three-neck flask with a stirrer and a thermometer, adding deionized water with the mass being 5 times of the ethylene glycol monovinyl polyethylene glycol ether, stirring until the ethylene glycol monovinyl polyethylene glycol ether is completely dissolved, adding hydrogen peroxide with the mass being 3 times of the ethylene glycol monovinyl polyethylene glycol ether, stirring for 5min, dropwise adding an acrylic acid aqueous solution and a modified mixture at a constant speed, preserving heat for 30min at the temperature of 40 ℃ after the dropwise adding is finished, then dropwise adding a sodium hydroxide aqueous solution, regulating the pH value to 6, and obtaining the anti-freezing modified polycarboxylate water reducer;
s4, according to the following steps of 1:3, pouring the plastic steel fiber and absolute ethyl alcohol into a container at a stirring speed of 300r/min, mixing and stirring for 10min, draining, and drying at 45 ℃ to constant weight, thus obtaining the anti-freezing modified plastic steel fiber;
s5, weighing 8 parts of antifreeze silicon dioxide, 18 parts of antifreeze modified polycarboxylate water reducer, 12 parts of antifreeze modified plastic steel fiber, 25 parts of complex additive mixture, 38 parts of antifreeze component and 50 parts of deionized water for standby according to parts by weight;
s6, mixing the antifreeze modified polycarboxylate water reducer, the complex type additive mixture, the antifreeze component and deionized water in parts by weight to obtain a liquid component, pouring the antifreeze silica and the antifreeze modified plastic steel fiber in parts by weight into a planetary ball mill for grinding for 5min, and mixing with the liquid component to obtain the antifreeze concrete additive after uniform mixing.
The stirring speed of the mixing and stirring in S1 is 300r/min, the stirring time is 10min, and the drying temperature in S1 is 55 ℃.
The stirring speed in S2 was 400r/min.
The dropping speed in S3 was 1 drop/S, and the mass fraction of the aqueous sodium hydroxide solution in S3 was 20%.
The molar ratio of acrylic acid, gamma-methacryloxypropyl trimethoxysilane and ethylene glycol monovinyl polyethylene glycol ether in S2 and S3 is 16:1:4.
the preparation method of the complex additive mixture in S5 comprises the following steps:
step 1, weighing 7 parts by weight of maleic anhydride and 100 parts by weight of deionized water, pouring the mixture into a three-neck flask with a stirrer, a thermometer and a condensation reflux device, and stirring at a stirring speed of 500r/min until the maleic anhydride is completely dissolved;
step 2, heating the three-neck flask in the step 1 to 90 ℃ in a water bath, adding 3 parts by weight of hydrogen peroxide aqueous solution, and reacting for 4 hours at a constant temperature under a stirring speed of 300 r/min;
step 3, adding 55 parts by weight of sodium hydroxide solution with the concentration of 0.1mol/L into the system in the step 2, reacting for 1h under the stirring condition of the original stirring speed, removing the solvent by a rotary evaporator after the reaction, and drying for 2h at the temperature of 45 ℃;
step 4, according to 1:5, dissolving the product obtained in the step 3 into deionized water, and stirring for 10min at a stirring speed of 300r/min to obtain the complex additive mixture.
The volume concentration of the aqueous hydrogen oxide solution in step 1 was 30%.
The preparation method of the antifreezing agent component in S5 comprises the following steps: according to 1:2:1, mixing ethylene glycol, propylene glycol and methanol according to the volume ratio, and stirring for 10min at the stirring speed of 600r/min to obtain the antifreezing agent component.
Example 2
The production process of the antifreeze concrete additive comprises the following steps of:
s1, according to 1:5, pouring nano silicon dioxide and glycerol into a container for mixing and stirring, placing the container at a frequency of 28kHz for ultrasonic dispersion for 10min after mixing and stirring, draining and drying the container to constant weight after ultrasonic dispersion, crushing the container to 200 meshes, and obtaining the anti-freezing silicon dioxide;
s2, acrylic acid and deionized water are mixed according to the following ratio of 1:6, stirring for 10min after mixing, recording as an acrylic acid aqueous solution, and mixing gamma-methacryloxypropyl trimethoxysilane with deionized water according to a ratio of 1:10, stirring for 10min after mixing, adding antifreeze silicon dioxide accounting for 20% of the total amount, and continuing stirring for 5min, wherein the obtained mixture is marked as a modified mixture;
s3, weighing a certain amount of ethylene glycol monovinyl polyethylene glycol ether, pouring the ethylene glycol monovinyl polyethylene glycol ether into a three-neck flask with a stirrer and a thermometer, adding deionized water with the mass being 8 times of the ethylene glycol monovinyl polyethylene glycol ether, stirring until the ethylene glycol monovinyl polyethylene glycol ether is completely dissolved, adding hydrogen peroxide with the mass being 3 times of the ethylene glycol monovinyl polyethylene glycol ether, stirring for 5min, uniformly dropwise adding an acrylic acid aqueous solution and a modified mixture, preserving heat at 40 ℃ for 30min after the dropwise adding is finished, then dropwise adding a sodium hydroxide aqueous solution, regulating the pH value to 7, and obtaining the anti-freezing modified polycarboxylate water reducer;
s4, according to the following steps of 1:3, pouring the plastic steel fiber and absolute ethyl alcohol into a container at a stirring speed of 400r/min, mixing and stirring for 10min, draining, and drying at 45 ℃ to constant weight, thus obtaining the anti-freezing modified plastic steel fiber;
s5, weighing 10 parts of antifreeze silicon dioxide, 22 parts of antifreeze modified polycarboxylate superplasticizer, 15 parts of antifreeze modified plastic steel fiber, 30 parts of complex type additive mixture, 40 parts of antifreeze component and 50 parts of deionized water for standby according to parts by weight;
s6, mixing the antifreeze modified polycarboxylate water reducer, the complex type additive mixture, the antifreeze component and deionized water in parts by weight to obtain a liquid component, pouring the antifreeze silica and the antifreeze modified plastic steel fiber in parts by weight into a planetary ball mill for grinding for 5min, and mixing with the liquid component to obtain the antifreeze concrete additive after uniform mixing.
The stirring speed of the mixing and stirring in S1 is 500r/min, the stirring time is 10min, and the drying temperature in S1 is 55 ℃.
The stirring speed in S2 was 500r/min.
The dropping speed in S3 was 2 drops/S, and the mass fraction of the aqueous sodium hydroxide solution in S3 was 20%.
The molar ratio of acrylic acid, gamma-methacryloxypropyl trimethoxysilane and ethylene glycol monovinyl polyethylene glycol ether in S2 and S3 is 16:1:4.
the preparation method of the complex additive mixture in S5 comprises the following steps:
step 1, weighing 7 parts by weight of maleic anhydride and 100 parts by weight of deionized water, pouring the mixture into a three-neck flask with a stirrer, a thermometer and a condensation reflux device, and stirring at a stirring speed of 500r/min until the maleic anhydride is completely dissolved;
step 2, heating the three-neck flask in the step 1 to 90 ℃ in a water bath, adding 3 parts by weight of hydrogen peroxide aqueous solution, and reacting for 4 hours at a constant temperature under a stirring speed of 300 r/min;
step 3, adding 55 parts by weight of sodium hydroxide solution with the concentration of 0.1mol/L into the system in the step 2, reacting for 1h under the stirring condition of the original stirring speed, removing the solvent by a rotary evaporator after the reaction, and drying for 3h at 50 ℃;
step 4, according to 1:5, dissolving the product obtained in the step 3 into deionized water, and stirring for 10min at a stirring speed of 300r/min to obtain the complex additive mixture.
The volume concentration of the aqueous hydrogen oxide solution in step 1 was 30%.
The preparation method of the antifreezing agent component in S5 comprises the following steps: according to 1:2:1, mixing ethylene glycol, propylene glycol and methanol according to the volume ratio, and stirring for 10min at the stirring speed of 600r/min to obtain the antifreezing agent component.
Example 3
The production process of the antifreeze concrete additive comprises the following steps of:
s1, according to 1:5, pouring nano silicon dioxide and glycerol into a container for mixing and stirring, placing the mixture under the frequency of 27kHz for ultrasonic dispersion for 9min, draining and drying the mixture to constant weight after ultrasonic dispersion, crushing the mixture to 200 meshes of sieve, and obtaining the antifreeze silicon dioxide;
s2, acrylic acid and deionized water are mixed according to the following ratio of 1:6, stirring for 10min after mixing, recording as an acrylic acid aqueous solution, and mixing gamma-methacryloxypropyl trimethoxysilane with deionized water according to a ratio of 1:10, stirring for 10min after mixing, adding antifreeze silicon dioxide accounting for 20% of the total amount, and continuing stirring for 5min, wherein the obtained mixture is marked as a modified mixture;
s3, weighing a certain amount of ethylene glycol monovinyl polyethylene glycol ether, pouring the ethylene glycol monovinyl polyethylene glycol ether into a three-neck flask with a stirrer and a thermometer, adding deionized water with the mass being 7 times of the ethylene glycol monovinyl polyethylene glycol ether, stirring until the ethylene glycol monovinyl polyethylene glycol ether is completely dissolved, adding hydrogen peroxide with the mass being 3 times of the ethylene glycol monovinyl polyethylene glycol ether, stirring for 5min, uniformly dropwise adding an acrylic acid aqueous solution and a modified mixture, preserving heat at 40 ℃ for 30min after the dropwise adding is finished, then dropwise adding a sodium hydroxide aqueous solution, regulating the pH value to 7, and obtaining the anti-freezing modified polycarboxylate water reducer;
s4, according to the following steps of 1:3, pouring the plastic steel fiber and absolute ethyl alcohol into a container at a stirring speed of 400r/min, mixing and stirring for 10min, draining, and drying at 45 ℃ to constant weight, thus obtaining the anti-freezing modified plastic steel fiber;
s5, weighing 9 parts of antifreeze silicon dioxide, 20 parts of antifreeze modified polycarboxylate superplasticizer, 14 parts of antifreeze modified plastic steel fiber, 28 complex type additive mixture, 39 parts of antifreeze component and 50 parts of deionized water for standby according to parts by weight;
s6, mixing the antifreeze modified polycarboxylate water reducer, the complex type additive mixture, the antifreeze component and deionized water in parts by weight to obtain a liquid component, pouring the antifreeze silica and the antifreeze modified plastic steel fiber in parts by weight into a planetary ball mill for grinding for 5min, and mixing with the liquid component to obtain the antifreeze concrete additive after uniform mixing.
The stirring speed of the mixing and stirring in S1 is 400r/min, the stirring time is 10min, and the drying temperature in S1 is 55 ℃.
The stirring speed in S2 was 500r/min.
The dropping speed in S3 was 2 drops/S, and the mass fraction of the aqueous sodium hydroxide solution in S3 was 20%.
The molar ratio of acrylic acid, gamma-methacryloxypropyl trimethoxysilane and ethylene glycol monovinyl polyethylene glycol ether in S2 and S3 is 16:1:4.
the preparation method of the complex additive mixture in S5 comprises the following steps:
step 1, weighing 7 parts by weight of maleic anhydride and 100 parts by weight of deionized water, pouring the mixture into a three-neck flask with a stirrer, a thermometer and a condensation reflux device, and stirring at a stirring speed of 500r/min until the maleic anhydride is completely dissolved;
step 2, heating the three-neck flask in the step 1 to 90 ℃ in a water bath, adding 3 parts by weight of hydrogen peroxide aqueous solution, and reacting for 4 hours at a constant temperature under a stirring speed of 300 r/min;
step 3, adding 55 parts by weight of sodium hydroxide solution with the concentration of 0.1mol/L into the system in the step 2, reacting for 1h under the stirring condition of the original stirring speed, removing the solvent by a rotary evaporator after the reaction, and drying for 3h at 48 ℃;
step 4, according to 1:5, dissolving the product obtained in the step 3 into deionized water, and stirring for 10min at a stirring speed of 300r/min to obtain the complex additive mixture.
The volume concentration of the aqueous hydrogen oxide solution in step 1 was 30%.
The preparation method of the antifreezing agent component in S5 comprises the following steps: according to 1:2:1, mixing ethylene glycol, propylene glycol and methanol according to the volume ratio, and stirring for 10min at the stirring speed of 600r/min to obtain the antifreezing agent component.
Performance detection
The performance of the admixture of examples 1 to 3 and comparative examples was examined using the admixture of examples 1 to 3 prepared in examples 1 to 3 of the present invention, examples 2 and 3, and the commercially available admixture was recorded as comparative example, and the specific examination method was as follows:
1. weighing 450 parts of cement, 650 parts of river sand, 900 parts of crushed stone and 160 parts of water according to parts by weight, mixing uniformly, dividing into 4 equal parts, adding 10 parts by weight of the additives of examples 1-3 and comparative examples into each part, and marking 4 parts of concrete sample blanks as examples 1-3 and comparative examples respectively;
2. according to the quick freezing method in test method Standard for the long-term Performance and durability of common concrete (GB/T50082-2009), a concrete freezing and thawing test is carried out, and the mass loss rate, the compressive strength and the chloride ion diffusion coefficient of a concrete sample blank cured for 28d before and after freezing and thawing are respectively tested, and the obtained data are recorded in tables 1-3:
TABLE 1
TABLE 2
TABLE 3 Table 3
As shown by the data in the table, compared with the concrete with the additive of the production process examples 1-3, the concrete has higher compressive strength and lower mass loss rate and chloride ion diffusion coefficient after repeated freezing and thawing, so that the concrete has better performance and better market application prospect.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. The production process of the antifreeze concrete additive is characterized by comprising the following steps of:
s1, according to 1:5, pouring nano silicon dioxide and glycerol into a container for mixing and stirring, placing the container at a frequency of 26-28kHz for ultrasonic dispersion for 8-10min after mixing and stirring, draining and drying the container to constant weight after ultrasonic dispersion, crushing the container to 200 meshes, and obtaining the anti-freezing silicon dioxide;
s2, acrylic acid and deionized water are mixed according to the following ratio of 1:6, stirring for 10min after mixing, recording as an acrylic acid aqueous solution, and mixing gamma-methacryloxypropyl trimethoxysilane with deionized water according to a ratio of 1:10, stirring for 10min after mixing, adding antifreeze silicon dioxide accounting for 20% of the total amount, and continuing stirring for 5min, wherein the obtained mixture is marked as a modified mixture;
s3, weighing a certain amount of ethylene glycol monovinyl polyethylene glycol ether, pouring the ethylene glycol monovinyl polyethylene glycol ether into a three-neck flask with a stirrer and a thermometer, adding deionized water with the mass of 5-8 times of the ethylene glycol monovinyl polyethylene glycol ether, stirring until the ethylene glycol monovinyl polyethylene glycol ether is completely dissolved, adding hydrogen peroxide with the mass of 3 times of the ethylene glycol monovinyl polyethylene glycol ether, stirring for 5min, uniformly dropwise adding an acrylic acid aqueous solution and a modified mixture, preserving heat for 30min at the temperature of 40 ℃ after the dropwise adding is finished, then dropwise adding a sodium hydroxide aqueous solution, regulating the pH value to 6-7, and obtaining the antifreeze modified polycarboxylate water reducer;
s4, according to the following steps of 1:3, pouring the plastic steel fiber and absolute ethyl alcohol into a container according to the feed liquid ratio, mixing and stirring at the stirring speed of 300-400r/min, draining water after stirring for 10min, and drying at the temperature of 45 ℃ to constant weight, thus obtaining the anti-freezing modified plastic steel fiber;
s5, weighing 8-10 parts of antifreeze silicon dioxide, 18-22 parts of antifreeze modified polycarboxylate water reducer, 12-15 parts of antifreeze modified plastic steel fiber, 25-30 parts of complex type additive mixture, 38-40 parts of antifreeze component and 50 parts of deionized water for standby according to parts by weight;
s6, mixing the antifreeze modified polycarboxylate water reducer, the complex type additive mixture, the antifreeze component and deionized water in parts by weight to obtain a liquid component, pouring the antifreeze silica and the antifreeze modified plastic steel fiber in parts by weight into a planetary ball mill for grinding for 5min, and mixing with the liquid component to obtain the antifreeze concrete additive after uniform mixing.
2. The process for producing the antifreeze concrete additive according to claim 1, wherein the stirring speed of the mixing and stirring in S1 is 300-500r/min, the stirring time is 10min, and the drying temperature in S1 is 55 ℃.
3. The process for producing an antifreeze concrete admixture according to claim 1, wherein the stirring speed in S2 is 400 to 500r/min.
4. The process for producing the antifreeze concrete additive according to claim 1, wherein the dropping speed in S3 is 1-2 drops/S, and the mass fraction of the sodium hydroxide aqueous solution in S3 is 20%.
5. The process for producing an antifreeze concrete additive according to claim 1, wherein the molar ratio of acrylic acid, gamma-methacryloxypropyl trimethoxysilane and ethylene glycol monovinyl polyethylene glycol ether in S2 and S3 is 16:1:4.
6. the process for producing an antifreeze concrete admixture according to claim 1, wherein the preparation method of the complex admixture mixture in S5 comprises the steps of:
step 1, weighing 7 parts by weight of maleic anhydride and 100 parts by weight of deionized water, pouring the mixture into a three-neck flask with a stirrer, a thermometer and a condensation reflux device, and stirring at a stirring speed of 500r/min until the maleic anhydride is completely dissolved;
step 2, heating the three-neck flask in the step 1 to 90 ℃ in a water bath, adding 3 parts by weight of hydrogen peroxide aqueous solution, and reacting for 4 hours at a constant temperature under a stirring speed of 300 r/min;
step 3, adding 55 parts by weight of sodium hydroxide solution with the concentration of 0.1mol/L into the system in the step 2, reacting for 1h under the stirring condition of the original stirring speed, removing the solvent by a rotary evaporator after the reaction, and drying for 2-3h at the temperature of 45-50 ℃;
step 4, according to 1:5, dissolving the product obtained in the step 3 into deionized water, and stirring for 10min at a stirring speed of 300r/min to obtain the complex additive mixture.
7. The process for producing an antifreeze concrete admixture according to claim 6, wherein the hydrogen peroxide aqueous solution in said step 1 has a volume concentration of 30%.
8. The production process of the antifreeze concrete additive according to claim 1, wherein the preparation method of the antifreeze component in the S5 is as follows: according to 1:2:1, mixing ethylene glycol, propylene glycol and methanol according to the volume ratio, and stirring for 10min at the stirring speed of 600r/min to obtain the antifreezing agent component.
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