A water reducing agent composition, its preparation method and application

Abstract

The present invention belongs to the technical field of concrete, and relates to a water reducing agent composition, a preparation method thereof and an application. The water reducing agent composition includes a polycarboxylate water reducing agent, a naphthalene sulfonate formaldehyde water reducing agent, an alkyl sulfonic acid-3-methylimidazole bisulfate and an antifoaming agent. The water reducing agent composition provided by the present invention reduces the mutual entanglement of the water reducing agent molecular chains by adding alkyl sulfonic acid-3-methylimidazole bisulfate, thereby improving the dispersion performance of the water reducing agent in concrete and improving the fluidity of the cement slurry. Moreover, this water reducing agent composition combines the performance of the polycarboxylate water reducing agent and the naphthalene sulfonate formaldehyde water reducing agent, and improves the frost resistance of concrete.

Description

Technical Field

[0001] The present invention belongs to the technical field of concrete, and relates to a water reducing agent composition, a preparation method thereof and an application thereof. Background Art

[0002] Concrete is a composite material widely used in construction engineering, which is mainly prepared by mixing cement, fine aggregate, coarse aggregate, water and various admixtures in a certain proportion. The most common admixture is the water reducing agent, which can significantly reduce the amount of water required for concrete mixing without sacrificing (or even improving) its fluidity, thereby enhancing the mechanical properties and durability after hardening. With the increasing market requirements for the performance of concrete, as one of the key components in concrete admixtures, the performance of the water reducing agent has also been subject to more and more stringent requirements.

[0003] As a new type of admixture, the polycarboxylate-based water reducing agent is the third generation of water reducing agent developed after the ordinary water reducing agent represented by lignin calcium and the high-efficiency water reducing agent represented by naphthalene series. It has received extensive attention due to its excellent performance and environmental protection characteristics. The polycarboxylate-based water reducing agent is a surfactant with a molecular structure of a carboxyl group graft copolymer. The molecular structure is comb-shaped, with a long and flexible main chain and multiple short side chains. It has a large degree of freedom. The main chain is polymerized from active monomers containing carboxyl groups and can be grafted with different active groups. The side chain is graft copolymerized from active monomers containing functional groups and the main chain. The polycarboxylate-based water reducing agent can greatly reduce the unit water consumption of concrete, improve the compressive strength of concrete, and significantly improve the construction performance of concrete. The action mechanisms of polycarboxylate products are generally the same, mainly including: 1) Lubrication mechanism: The polar groups of the water reducing agent are adsorbed on the surface of cement particles and associate with water molecules in the form of hydrogen bonds to form a stable water film on the surface of cement particles, preventing direct contact between cement particles and increasing the sliding ability of cement particles, playing a lubricating role; 2) Electrostatic repulsion mechanism: The negatively charged ions of the water reducing agent are adsorbed on the surface of cement particles in a direction under the action of the positive charge of cement particles. The surface of cement particles is charged with the same charge, generating electrostatic repulsion. The flocculation structure of cement particles is disintegrated and dispersed with each other, releasing the free water wrapped in the flocs, thereby effectively increasing the fluidity of the mixture; 3) Steric hindrance mechanism: The main chain of the polycarboxylate water reducing agent is adsorbed on the surface of cement particles, and the long side chains are dispersed in the liquid phase, showing a comb-shaped flexible network structure with a high steric hindrance. The hydrophilic groups on the side chains form a hydration film with water on the surface of cement particles through hydrogen bonds, and the electrostatic repulsion is generated by the same-sex charges adsorbed on the surface of cement particles.

[0004] The cost of polycarboxylate superplasticizers is relatively high, and they are sensitive to the types of cement and the properties of aggregates. Raw materials from different sources may affect their performance, and compatibility tests are required. Naphthalene sulfonate formaldehyde superplasticizers have a low cost, excellent dispersibility, and are insensitive to cement and aggregates. If naphthalene sulfonate formaldehyde superplasticizers can be compounded with polycarboxylate superplasticizers, it may be a new research direction to improve the performance of superplasticizers. However, there is an incompatibility problem between polycarboxylate superplasticizers and naphthalene sulfonate formaldehyde superplasticizers. The more flexible polycarboxylate superplasticizer molecules will surround the more rigid naphthalene sulfonate formaldehyde superplasticizer molecules. After mixing, the molecular chains of the superplasticizers will entangle and interact with each other, resulting in a decrease in the dispersing ability, which is not conducive to the superplasticizer's function and leads to a decline in the performance of concrete. Summary of the Invention

[0005] To solve the above problems existing in the prior art, the purpose of the present invention is to provide a superplasticizer composition, its preparation method and application to overcome the deficiencies of the prior art.

[0006] One object of the present invention is achieved through the following technical solutions:

[0007] A superplasticizer composition comprising a polycarboxylate superplasticizer, a naphthalene sulfonate formaldehyde superplasticizer, an alkyl sulfonic acid-3-methylimidazole bisulfate, and an antifoaming agent;

[0008] Relative to 100 parts by weight of the solid components in the polycarboxylate superplasticizer and the naphthalene sulfonate formaldehyde superplasticizer, the addition amount of the alkyl sulfonic acid-3-methylimidazole bisulfate is 0.5 - 20 parts by weight.

[0009] In the superplasticizer composition, both the polycarboxylate superplasticizer and the naphthalene sulfonate formaldehyde superplasticizer are liquids. Preferably, the solid content of the polycarboxylate superplasticizer is 30 - 70 wt%, and the solid content of the naphthalene sulfonate formaldehyde superplasticizer is 30 - 70 wt%.

[0010] Preferably, the mass ratio of the solid component of the polycarboxylate superplasticizer to the solid component of the naphthalene sulfonate formaldehyde superplasticizer is 40:60 - 90:10. More preferably, it is 50:50 - 80:20.

[0011] Preferably, the alkyl sulfonic acid-3-methylimidazole bisulfate is one or more of 1-ethylsulfonic acid-3-methylimidazole bisulfate, 1-propylsulfonic acid-3-methylimidazole bisulfate, and 1-butylsulfonic acid-3-methylimidazole bisulfate.

[0012] Preferably, the defoamer is one or more of 2-ethylhexanol, cetyl alcohol, dodecanol, ethylene glycol, 3-heptanol, polyethylene glycol, polypropylene glycol, polyvinyl alcohol, fatty alcohol polyether, polydimethylsiloxane, polyoxyethylene polyoxypropylene ether, polyoxypropylene polyoxyethylene glycerol ether (GPE defoamer), aluminum stearate, zinc stearate, paraffin wax, mineral oil, polyoxyethylene, polyoxypropylene, etc.

[0013] Preferably, the addition amount of 3-methylimidazolium bisulfate alkyl sulfonate is 1 to 10 parts by weight relative to 100 parts by weight of the solid components in the polycarboxylate-based water reducing agent and the naphthalene sulfonate formaldehyde water reducing agent.

[0014] Preferably, the addition amount of the defoamer is 0.001 to 1 part by weight relative to 100 parts by weight of the solid components in the polycarboxylate-based water reducing agent and the naphthalene sulfonate formaldehyde water reducing agent. More preferably, it is 0.01 to 1 part by weight.

[0015] The second object of the present invention is achieved by the following technical solutions:

[0016] A preparation method of a water reducing agent composition includes the following steps:

[0017] Add 3-methylimidazolium bisulfate alkyl sulfonate to the naphthalene sulfonate formaldehyde water reducing agent, stir for 1 to 60 minutes, and then add the polycarboxylate-based water reducing agent and the defoamer and stir further to obtain the water reducing agent composition.

[0018] Preferably, add 3-methylimidazolium bisulfate alkyl sulfonate to the naphthalene sulfonate formaldehyde water reducing agent and stir for 10 to 30 minutes.

[0019] The stirring speed in the text can be listed as 100 to 1000 rpm.

[0020] The third object of the present invention is achieved by the following technical solutions:

[0021] A concrete formulation includes cement, mineral admixture, coarse aggregate, fine aggregate, water, and a water reducing agent composition. The mass of the solid components of the polycarboxylate-based water reducing agent and the naphthalene sulfonate formaldehyde water reducing agent in the water reducing agent composition is 0.1 to 2 wt% of the mass of the cement.

[0022] Preferably, the mineral admixture is one or more of fly ash, microsilica, and slag powder.

[0023] Preferably, the addition amount of the mineral admixture is 20 to 60 wt% of the cement.

[0024] Preferably, the coarse aggregate is crushed stone with a particle size of 5 to 40 mm.

[0025] Preferably, the fine aggregate is river sand with a particle size of 0.075 to 4.75 mm.

[0026] Preferably, the mass ratio of fine aggregate to coarse aggregate is 55:45 to 70:30.

[0027] Preferably, the addition amount of water is such that the total amount of water in the formulation is 0.4 to 0.6 of the cement.

[0028] Preferably, the concrete formulation further comprises amino-polyethylene glycol-silane.

[0029] More preferably, the addition amount of the amino-polyethylene glycol-silane is 0.05 to 2 wt% of the cement. Even more preferably, it is 0.1 to 1 wt%.

[0030] More preferably, the molecular weight of the amino-polyethylene glycol-silane is 1000 to 10000.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The present invention provides a water reducing agent composition, which is compounded by a polycarboxylate water reducing agent and a naphthalene sulfonate formaldehyde water reducing agent, and an alkyl sulfonic acid-3-methylimidazole hydrogen sulfate is added to reduce the mutual entanglement of the water reducing agent molecular chains, thereby improving the dispersion performance of the water reducing agent in concrete and improving the fluidity of the cement slurry. And this water reducing agent composition combines the performance of the polycarboxylate water reducing agent and the naphthalene sulfonate formaldehyde water reducing agent, and improves the frost resistance of concrete.

[0033] 2. The water reducing agent composition of the present invention includes an antifoaming agent, which can effectively defoam the air entrained in the composition and improve the storage stability of the composition; the antifoaming agent can also reduce the inferior bubbles in the concrete and improve the strength of the cement slurry.

[0034] 3. The present invention also provides a preparation method of the water reducing agent composition. First, the alkyl sulfonic acid-3-methylimidazole hydrogen sulfate reacts with the naphthalene sulfonate formaldehyde water reducing agent, so that the alkyl sulfonic acid-3-methylimidazole hydrogen sulfate binds to the naphthalene sulfonate formaldehyde water reducing agent molecular chain. When the polycarboxylate water reducing agent is added later, the polycarboxylate water reducing agent molecular chain is difficult to entangle around the naphthalene sulfonate formaldehyde water reducing agent again, improving the fluidity.

[0035] 4. Adding a certain amount of amino-polyethylene glycol-silane to the concrete in the present invention is beneficial to improving the frost resistance of the concrete. This may be based on the following principle: The polyethylene glycol in the molecular structure of amino-polyethylene glycol-silane has a certain flexibility, which can form a structure similar to a "molecular barrier" inside the concrete, filling the pores and microcracks in the concrete, reducing the penetration channels of water in the concrete, improving the impermeability of the concrete, thereby reducing the risk of freeze-thaw damage to the concrete caused by water intrusion, and enhancing the frost resistance of the concrete; The amino group in the molecular structure of amino-polyethylene glycol-silane participates in the hydration reaction of cement, making the concrete form a stable and dense structure, further improving its frost resistance ability, and ensuring that the concrete can still maintain good performance in a cold environment. Detailed implementation mode

[0036] The following are specific examples to further describe and illustrate the technical solutions of the present invention. It should be understood that the specific examples described here are only used to help understand the present invention and are not used for specific limitations of the present invention. If there is no special description, the raw materials used in the embodiments of the present invention are all commonly used raw materials in the art, and the methods used in the embodiments are all conventional methods in the art.

[0037] The polycarboxylate-based water reducer is the TK-101A polycarboxylate water reducer of Sichuan Tieke New Building Materials Co., Ltd., with a solid content of 46%;

[0038] The naphthalene sulfonate formaldehyde water reducer is the ASD-5 naphthalene-based high-efficiency water reducer of Pingdingshan Aosida Technology Co., Ltd., with a solid content of 40%;

[0039] The defoamer is the GPE defoamer, purchased from Guangdong Nanhui New Materials Co., Ltd.;

[0040] 1-Butylsulfonic acid-3-methylimidazolium hydrogen sulfate, 827320-59-2, Aladdin;

[0041] 1-Butyl-3-methylimidazolium hydrogen sulfate, 262297-13-2, Aladdin;

[0042] The cement is P·O 42.5 grade ordinary Portland cement;

[0043] The fly ash is Class II fly ash;

[0044] The microsilica powder is the silicon powder produced by Shandong Bokken Silicon Materials Factory, with an SiO2 content of 97.6%;

[0045] Crushed stone: Limestone crushed stone with a particle size range of 5~30.6mm, and a crushing index of 8.8%;

[0046] River sand: The mud content is 1.5%, and the fineness modulus is 2.9;

[0047] The amino-polyethylene glycol-silane is NH2-PEG-Silane from Ruixi Biotechnology, MW: 2000;

[0048] The silane-polyethylene glycol-silane is Silane-PEG-Silane from Ruixi Biotechnology, MW: 2000. Example 1

[0049] The water reducer composition of this example is: 60 parts by weight of polycarboxylate water reducer (solid weight fraction is 27.6), 40 parts by weight of naphthalene sulfonate formaldehyde water reducer (solid weight fraction is 16), 1.48 parts by weight of 1-butylsulfonic acid-3-methylimidazole hydrogensulfate, and 0.01 part by weight of defoamer.

[0050] The preparation method of the water reducer composition of this example includes the following steps: Add 1-butylsulfonic acid-3-methylimidazole hydrogensulfate to the naphthalene sulfonate formaldehyde water reducer, stir at 300 rpm for 20 min, then add the polycarboxylate water reducer and defoamer and stir for another 2 min to obtain the water reducer composition. Example 2

[0051] The water reducer composition of this example is: 60 parts by weight of polycarboxylate water reducer (solid weight fraction is 27.6), 40 parts by weight of naphthalene sulfonate formaldehyde water reducer (solid weight fraction is 16), 1.48 parts by weight of 1-butylsulfonic acid-3-methylimidazole hydrogensulfate, and 0.01 part by weight of defoamer.

[0052] The preparation method of the water reducer composition of this example includes the following steps: Mix 1-butylsulfonic acid-3-methylimidazole hydrogensulfate, naphthalene sulfonate formaldehyde water reducer, polycarboxylate water reducer and defoamer, stir at 300 rpm for 20 min to obtain the water reducer composition. Example 3

[0053] The water reducer composition of this example is: 60 parts by weight of polycarboxylate water reducer (solid weight fraction is 27.6), 40 parts by weight of naphthalene sulfonate formaldehyde water reducer (solid weight fraction is 16), 1.48 parts by weight of 1-butylsulfonic acid-3-methylimidazole hydrogensulfate, and 0.01 part by weight of defoamer.

[0054] The preparation method of the water reducer composition of this example includes the following steps: Add 1-butylsulfonic acid-3-methylimidazole hydrogensulfate to the polycarboxylate water reducer, stir at 300 rpm for 20 min, then add the naphthalene sulfonate formaldehyde water reducer and defoamer and stir for another 2 min to obtain the water reducer composition.

[0055] Comparative Example 1

[0056] The water reducing agent composition of Comparative Example 1 is: 100 parts by weight of a polycarboxylate water reducing agent (46 parts by weight of solid), 1.48 parts by weight of 1-butylsulfonic acid-3-methylimidazolium hydrogen sulfate, and 0.01 part by weight of an antifoaming agent.

[0057] The preparation method of the water reducing agent composition of Comparative Example 1 includes the following steps: Stir 1-butylsulfonic acid-3-methylimidazolium hydrogen sulfate, the polycarboxylate water reducing agent, and the antifoaming agent at 300 rpm for 20 min to obtain the water reducing agent composition.

[0058] Comparative Example 2

[0059] The water reducing agent composition of Comparative Example 2 is: 100 parts by weight of a naphthalene sulfonate formaldehyde water reducing agent (40 parts by weight of solid), 1.48 parts by weight of 1-butylsulfonic acid-3-methylimidazolium hydrogen sulfate, and 0.01 part by weight of an antifoaming agent.

[0060] The preparation method of the water reducing agent composition of Comparative Example 2 includes the following steps: Stir 1-butylsulfonic acid-3-methylimidazolium hydrogen sulfate, the naphthalene sulfonate formaldehyde water reducing agent, and the antifoaming agent at 300 rpm for 20 min to obtain the water reducing agent composition.

[0061] Comparative Example 3

[0062] The water reducing agent composition of Comparative Example 3 is: 60 parts by weight of a polycarboxylate water reducing agent (27.6 parts by weight of solid), 40 parts by weight of a naphthalene sulfonate formaldehyde water reducing agent (16 parts by weight of solid), 0.01 part by weight of an antifoaming agent, and 1.48 parts by weight of water.

[0063] The preparation method of the water reducing agent composition of Comparative Example 3 includes the following steps: Stir the naphthalene sulfonate formaldehyde water reducing agent, the polycarboxylate water reducing agent, the antifoaming agent, and water at 300 rpm for 20 min to obtain the water reducing agent composition.

[0064] Comparative Example 4

[0065] The water reducing agent composition of Comparative Example 4 is: 60 parts by weight of a polycarboxylate water reducing agent (27.6 parts by weight of solid), 40 parts by weight of a naphthalene sulfonate formaldehyde water reducing agent (16 parts by weight of solid), 1.48 parts by weight of 1-butyl-3-methylimidazolium hydrogen sulfate, and 0.01 part by weight of an antifoaming agent.

[0066] The preparation method of the water reducing agent composition of Comparative Example 4 includes the following steps: Add 1-butyl-3-methylimidazolium hydrogen sulfate to the naphthalene sulfonate formaldehyde water reducing agent, stir at 300 rpm for 20 min, then add the polycarboxylate water reducing agent and the antifoaming agent and stir for another 2 min to obtain the water reducing agent composition.

[0067] Application Example 1

[0068] The concrete formulation of the embodiment of this application is: 100 g of cement, 25 g of fly ash, 25 g of microsilica, 400 g of crushed stone, 500 g of river sand, 50 g of water, and 2.8 g of the water-reducing agent composition of Example 1.

[0069] Application Example 2

[0070] The concrete formulation of the embodiment of this application is: 100 g of cement, 25 g of fly ash, 25 g of microsilica, 400 g of crushed stone, 500 g of river sand, 50 g of water, and 2.8 g of the water-reducing agent composition of Example 2.

[0071] Application Example 3

[0072] The concrete formulation of the embodiment of this application is: 100 g of cement, 25 g of fly ash, 25 g of microsilica, 400 g of crushed stone, 500 g of river sand, 50 g of water, and 2.8 g of the water-reducing agent composition of Example 3.

[0073] Application Example 4

[0074] The concrete formulation of the embodiment of this application is: 100 g of cement, 25 g of fly ash, 25 g of microsilica, 400 g of crushed stone, 500 g of river sand, 50 g of water, 2.8 g of the water-reducing agent composition of Example 1, and 0.5 g of amino-polyethylene glycol-silane.

[0075] Application Example 5

[0076] The concrete formulation of Application Example 5 is: 100 g of cement, 25 g of fly ash, 25 g of microsilica, 400 g of crushed stone, 500 g of river sand, 50 g of water, 2.8 g of the water-reducing agent composition of Example 1, and 0.5 g of silane-polyethylene glycol-silane.

[0077] Application Comparative Example 1

[0078] The concrete formulation of Application Comparative Example 1 is: 100 g of cement, 25 g of fly ash, 25 g of microsilica, 400 g of crushed stone, 500 g of river sand, 50 g of water, and 1.2 g of polycarboxylate water-reducing agent.

[0079] Application Comparative Example 2

[0080] The concrete formulation of Application Comparative Example 2 is: 100 g of cement, 25 g of fly ash, 25 g of microsilica, 400 g of crushed stone, 500 g of river sand, 50 g of water, and 1.2 g of naphthalene sulfonate formaldehyde water-reducing agent.

[0081] Application Comparative Example 3

[0082] The concrete formulation of Application Comparative Example 3 is: 100 g of cement, 25 g of fly ash, 25 g of microsilica, 400 g of crushed stone, 500 g of river sand, 50 g of water, and 2.65 g of the water-reducing agent composition of Comparative Example 1.

[0083] Application Comparative Example 4

[0084] The concrete formula of Application Comparative Example 4 is: 100 g of cement, 25 g of fly ash, 25 g of microsilica, 400 g of crushed stone, 500 g of river sand, 50 g of water, and 3.04 g of the water reducing agent composition of Comparative Example 2.

[0085] Application Comparative Example 5

[0086] The concrete formula of Application Comparative Example 5 is: 100 g of cement, 25 g of fly ash, 25 g of microsilica, 400 g of crushed stone, 500 g of river sand, 50 g of water, and 2.8 g of the water reducing agent composition of Comparative Example 3.

[0087] Application Comparative Example 6

[0088] The concrete formula of Application Comparative Example 6 is: 100 g of cement, 25 g of fly ash, 25 g of microsilica, 400 g of crushed stone, 500 g of river sand, 50 g of water, and 2.8 g of the water reducing agent composition of Comparative Example 4.

[0089] Weigh each raw material of the concrete formulas of Application Examples 1 - 5 and Application Comparative Examples 1 - 6, pour the raw materials into the mixing pan of the mixer, mix them evenly to obtain cement slurry. Pour part of the cement slurry into the frustum cone mold, vertically lift the frustum cone mold, let the cement paste flow naturally on the glass plate, measure the maximum diameter of the flowing paste with a ruler as the recorded data, and record the initial fluidity in mm. The results are shown in Table 1.

[0090] Put the remaining part of the cement slurry into the mold. At the same time, tamp the concrete in the mold, then move the mold containing the concrete to the vibrating table of the concrete test mold and vibrate it 3 times, each time for 90 s. Continuously add concrete to the mold during the process to always keep the mold full of concrete. Take the prepared concrete specimen with the mold and cure it in the air for 1 d, then demold it and put it into the concrete curing box for curing. Conduct a strength test on the concrete cured to the 28th day, and use a constant stress compression testing machine to conduct a compressive strength test on the concrete test block. Take another group of specimens and conduct a frost resistance test on the concrete cured for 28 d, and use a freeze-thaw cycle tester to conduct a freeze-thaw cycle test on the test block. Detect the compressive strength after 100 freeze-thaw cycles, and calculate the compressive strength change rate % = (original compressive strength - compressive strength after 100 freeze-thaw cycles) / original compressive strength * 100%. The results are shown in Table 1.

[0091] Table 1 Performance data of Application Examples and Application Comparative Examples

[0092]

[0093] In Comparative Application Example 1 and Comparative Application Example 2, the water reducers added were polycarboxylate water reducer and naphthalene sulfonate formaldehyde water reducer respectively. The water reducer added in Comparative Application Example 5 was a composite composition formed by polycarboxylate water reducer and naphthalene sulfonate formaldehyde water reducer. It can be seen from the data comparison in Table 1 that the composite addition of polycarboxylate water reducer and naphthalene sulfonate formaldehyde water reducer will reduce the fluidity of the cement paste due to the molecular entanglement of the two, and the compressive strength and frost resistance will also decrease accordingly. From the comparison between Comparative Application Example 3 and Comparative Application Example 1, and the comparison between Comparative Application Example 4 and Comparative Application Example 2, it can be seen that adding 1-butylsulfonic acid-3-methylimidazolium hydrogen sulfate to polycarboxylate water reducer or naphthalene sulfonate formaldehyde water reducer has no significant effect on fluidity. From the comparison between Comparative Application Example 5 and Application Example 1, it can be seen that when polycarboxylate water reducer and naphthalene sulfonate formaldehyde water reducer are combined, adding 1-butylsulfonic acid-3-methylimidazolium hydrogen sulfate is beneficial to avoid molecular chain entanglement, improve fluidity, and further improve compressive strength and frost resistance. Comparative Application Example 6 used 1-butyl-3-methylimidazolium hydrogen sulfate, which can improve fluidity compared with Comparative Application Example 5, but the improvement amplitude is not as good as that of 1-butylsulfonic acid-3-methylimidazolium hydrogen sulfate. From the comparison between Application Functional Example 2, Application Example 3 and Application Example 1, it can be seen that reacting 1-butylsulfonic acid-3-methylimidazolium hydrogen sulfate with naphthalene sulfonate formaldehyde water reducer first is beneficial to avoid molecular entanglement and improve fluidity.

[0094] It can be seen from the comparison between Application Example 4 and Application Example 1 that adding amino-polyethylene glycol-silane to concrete is beneficial to improve the frost resistance of concrete. While adding silane-polyethylene glycol-silane (Application Example 5) has limited improvement in frost resistance, which is not as good as the effect of amino-polyethylene glycol-silane.

[0095] All aspects, embodiments, and features of the present invention should be considered illustrative in all respects and do not limit the present invention. The scope of the present invention is only defined by the claims. Without departing from the spirit and scope of the claimed invention, those skilled in the art will understand other embodiments, modifications, and uses.

[0096] In the preparation method of the present invention, the order of each step is not limited to the listed order. For those of ordinary skill in the art, without creative efforts, the changes in the sequence of each step are also within the protection scope of the present invention. In addition, two or more steps or actions can be carried out simultaneously.

[0097] Finally, it should be noted that the specific embodiments described herein are merely illustrative of the present invention and do not limit the implementation manner of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways for substitution. It is not necessary and impossible to list all the implementation manners here. And those obvious changes or variations derived from the essential spirit of the present invention still fall within the protection scope of the present invention. Interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A water reducing agent composition, characterized in that, It includes polycarboxylate superplasticizer, naphthalene sulfonate formaldehyde superplasticizer, alkylsulfonic acid-3-methylimidazole hydrogensulfate and defoamer; Relative to 100 parts by weight of the solid components in the polycarboxylate superplasticizer and naphthalene sulfonate formaldehyde superplasticizer, the addition amount of alkylsulfonic acid-3-methylimidazole hydrogensulfate is 0.5 - 20 parts by weight; The superplasticizer composition is prepared by the following steps: adding alkylsulfonic acid-3-methylimidazole hydrogensulfate into naphthalene sulfonate formaldehyde superplasticizer, stirring for 10 - 60 min, and then adding polycarboxylate superplasticizer and defoamer for further stirring to obtain the superplasticizer composition.

2. The water reducing agent composition according to claim 1, characterized in that, Both the polycarboxylate superplasticizer and naphthalene sulfonate formaldehyde superplasticizer are liquids. The solid content of the polycarboxylate superplasticizer is 30 - 70 wt%, and the solid content of the naphthalene sulfonate formaldehyde superplasticizer is 30 - 70 wt%.

3. The water reducing agent composition according to claim 1 or 2, characterized in that, The mass ratio of the solid components of the polycarboxylate superplasticizer to the solid components of the naphthalene sulfonate formaldehyde superplasticizer is 40:60 - 90:

10.

4. A water reducing agent composition according to claim 1, characterized in that The alkylsulfonic acid-3-methylimidazole hydrogensulfate is one or more of 1-ethylsulfonic acid-3-methylimidazole hydrogensulfate, 1-propylsulfonic acid-3-methylimidazole hydrogensulfate, 1-butylsulfonic acid-3-methylimidazole hydrogensulfate.

5. The water reducing agent composition according to claim 1, wherein Relative to 100 parts by weight of the solid components in the polycarboxylate superplasticizer and naphthalene sulfonate formaldehyde superplasticizer, the addition amount of alkylsulfonic acid-3-methylimidazole hydrogensulfate is 1 - 10 parts by weight, and the addition amount of defoamer is 0.001 - 1 part by weight.

6. A concrete formulation, characterized in that, It includes cement, mineral admixture, coarse aggregate, fine aggregate, water, and the superplasticizer composition described in claim 1. The mass of the solid components of the polycarboxylate superplasticizer and naphthalene sulfonate formaldehyde superplasticizer in the superplasticizer composition is 0.1 - 2 wt% of the mass of the cement.

7. A concrete formulation according to claim 6, characterized in that, The mineral admixture is one or more of fly ash, microsilica, and slag powder; The addition amount of the mineral admixture is 20 - 60 wt% of the cement; The coarse aggregate is crushed stone with a particle size of 5 - 40 mm; The fine aggregate is river sand with a particle size of 0.075 - 4.75 mm; The mass ratio of the fine aggregate to the coarse aggregate is 55:45 - 70:

30.

8. A concrete formulation according to claim 6, characterized in that The concrete formulation further includes amino-polyethylene glycol-silane.

9. A concrete formulation according to claim 8, characterized in that, The addition amount of the amino-polyethylene glycol-silane is 0.05 - 2 wt% of the cement; The molecular weight of the amino-polyethylene glycol-silane is 1000 - 10000.

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