Water reducing agent composition as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of concrete, and relates to a water reducing agent composition as well as a preparation method and application thereof. The water reducing agent composition comprises a polycarboxylic acid type water reducing agent, a naphthalene sulfonate formaldehyde water reducing agent, alkyl sulfonic acid-3-methylimidazolium hydrogen sulfate and a defoaming agent. According to the water reducing agent composition provided by the invention, the alkyl sulfonic acid-3-methylimidazolium hydrogen sulfate is added to reduce intertwining of molecular chains of the water reducing agent, so that the dispersing performance of the water reducing agent in concrete is improved, and the flowability of cement slurry is improved. And the water reducer composition integrates the performance of the polycarboxylic acid water reducer and the performance of the naphthalene sulfonate formaldehyde water reducer, and improves the frost resistance of the concrete.

Description

Technical Field

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

[0002] Concrete is a composite material widely used in construction projects. It is mainly made of cement, fine aggregate, coarse aggregate, water and various admixtures mixed in a certain proportion. The most common admixture is water reducer, 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. As the market's requirements for concrete performance become higher and higher, water reducer, as one of the key ingredients in concrete admixtures, has also been subject to increasingly stringent requirements for its performance.

[0003] As a new type of admixture, polycarboxylic acid water reducer is the third generation water reducer developed after ordinary water reducers represented by wood calcium and high-efficiency water reducers represented by naphthalene. It has attracted wide attention for its superior performance and environmental protection. Polycarboxylic acid water reducer is a surfactant with a molecular structure of carboxyl grafted copolymer. The molecular structure is comb-shaped, with a long and flexible main chain and multiple short side chains, and a large degree of freedom. The main chain is polymerized from active monomers containing carboxyl groups, and different active groups can be grafted. The side chain is grafted copolymerized from active monomers containing functional groups and the main chain. Polycarboxylic acid water reducers 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 mechanism of polycarboxylic acid products is roughly the same, mainly including: 1) Lubrication mechanism: the polar groups of the water reducer 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, increasing the sliding ability of cement particles, and playing a lubricating role; 2) Electrostatic repulsion mechanism: the negatively charged ions of the water reducer will act on the positively charged cement particles. The polycarboxylic acid water-reducing agent is adsorbed on the surface of cement particles in a directional manner. The surface of cement particles carries charges of the same electrical property, generating electrostatic repulsion. The flocculation structure of cement particles disintegrates and disperses mutually, releasing free water wrapped in the flocs, thereby effectively increasing the fluidity of the mixture; 3) Mechanism of steric hindrance: The main chain of polycarboxylic acid water-reducing agent is adsorbed on the surface of cement particles, and the long side chains are dispersed in the liquid phase, presenting a comb-like flexible network structure with high steric hindrance. The hydrophilic groups on the side chains form a hydration film on the surface of cement particles through hydrogen bonds with water, and the like charges adsorbed on the surface of cement particles generate electrostatic repulsion.

[0004] Polycarboxylic acid-based water reducers are expensive and are sensitive to cement types and aggregate properties. Raw materials from different sources may affect their performance, so adaptation tests are required. Naphthalenesulfonate formaldehyde water reducers are cheap, have excellent dispersibility, and are insensitive to cement and aggregate. If naphthalenesulfonate formaldehyde water reducers can be used in combination with polycarboxylic acid-based water reducers, it may be a new research direction to improve the performance of water reducers. However, there is an incompatibility problem between polycarboxylic acid-based water reducers and naphthalenesulfonate formaldehyde water reducers. The more flexible polycarboxylic acid water reducer molecules will surround the more rigid naphthalenesulfonate formaldehyde water reducer. After mixing, the water reducer molecular chains will entangle and interact with each other, resulting in a decrease in dispersion ability, which is not conducive to the water reducer functioning and leads to a decrease in concrete performance. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the object of the present invention is to provide a water reducing agent composition and a preparation method and application thereof, so as to overcome the shortcomings of the prior art.

[0006] One object of the present invention is achieved by the following technical solutions: A water reducing agent composition, comprising a polycarboxylic acid water reducing agent, a naphthalenesulfonate formaldehyde water reducing agent, alkylsulfonic acid-3-methylimidazole hydrogen sulfate and a defoaming agent; The amount of alkylsulfonic acid-3-methylimidazole hydrogen sulfate added is 0.5 to 20 parts by weight relative to 100 parts by weight of the solid content in the polycarboxylic acid-based water-reducing agent and the naphthalenesulfonate formaldehyde water-reducing agent.

[0007] In the water reducer composition, the polycarboxylic acid water reducer and the naphthalenesulfonate formaldehyde water reducer are both liquids. Preferably, the solid content of the polycarboxylic acid water reducer is 30-70wt%, and the solid content of the naphthalenesulfonate formaldehyde water reducer is 30-70wt%.

[0008] Preferably, the mass ratio of the solid content of the polycarboxylic acid-based water-reducing agent to the solid content of the naphthalenesulfonate formaldehyde water-reducing agent is 40:60 to 90:10, and more preferably 50:50 to 80:20.

[0009] Preferably, the alkylsulfonic acid-3-methylimidazole hydrogen sulfate is one or more of 1-ethylsulfonic acid-3-methylimidazole hydrogen sulfate, 1-propylsulfonic acid-3-methylimidazole hydrogen sulfate, and 1-butylsulfonic acid-3-methylimidazole hydrogen sulfate.

[0010] Preferably, the defoaming agent is one or more of 2-ethylhexanol, hexadecanol, dodecanol, ethylene glycol, 3-heptanol, polyethylene glycol, polypropylene glycol, polyoxyethylene alcohol, fatty alcohol polyether, polydimethylsiloxane, polyoxyethylene polyoxypropylene ether, polyoxypropylene polyoxyethylene glycerol ether (GPE defoaming agent), aluminum stearate, zinc stearate, paraffin, mineral oil, polyoxyethylene, polyoxypropylene, etc.

[0011] Preferably, the amount of alkylsulfonic acid-3-methylimidazole hydrogen sulfate added is 1 to 10 parts by weight relative to 100 parts by weight of the solid content in the polycarboxylic acid-based water-reducing agent and the naphthalenesulfonate formaldehyde water-reducing agent.

[0012] Preferably, the amount of the defoamer added is 0.001 to 1 part by weight, more preferably 0.01 to 1 part by weight, relative to 100 parts by weight of the solid content in the polycarboxylic acid-based water-reducing agent and the naphthalenesulfonate formaldehyde water-reducing agent.

[0013] The second object of the present invention is achieved by the following technical solutions: A method for preparing a water reducing agent composition comprises the following steps: Alkylsulfonic acid-3-methylimidazole hydrogen sulfate is added to the naphthalenesulfonate formaldehyde water reducer, stirred for 1 to 60 minutes, and then a polycarboxylic acid water reducer and a defoamer are added and further stirred to obtain a water reducer composition.

[0014] Preferably, alkylsulfonic acid-3-methylimidazole hydrogen sulfate is added to the naphthalenesulfonate formaldehyde water reducer and stirred for 10 to 30 minutes.

[0015] The stirring speed in this article can be listed as 100~1000rpm.

[0016] The third object of the present invention is achieved by the following technical solutions: A concrete formula comprises cement, mineral admixture, coarse aggregate, fine aggregate, water and a water reducing agent composition, wherein the mass of the solid components of the polycarboxylic acid water reducing agent and the naphthalenesulfonate formaldehyde water reducing agent in the water reducing agent composition is 0.1-2wt% of the mass of the cement.

[0017] Preferably, the mineral admixture is one or more of fly ash, microsilica powder and slag powder.

[0018] Preferably, the amount of mineral admixture added is 20-60wt% of cement.

[0019] Preferably, the coarse aggregate is crushed stone with a particle size of 5 to 40 mm.

[0020] Preferably, the fine aggregate is river sand with a particle size of 0.075-4.75 mm.

[0021] Preferably, the mass ratio of fine aggregate to coarse aggregate is 55:45~70:30.

[0022] Preferably, the amount of water added is such that the total amount of water in the formulation is 0.4-0.6 of the cement.

[0023] Preferably, the concrete formulation further comprises amino-polyethylene glycol-silane.

[0024] More preferably, the amount of amino-polyethylene glycol-silane added is 0.05-2 wt % of cement, and even more preferably 0.1-1 wt %.

[0025] More preferably, the molecular weight of the amino-polyethylene glycol-silane is 1000-10000.

[0026] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a water reducer composition, which is compounded by a polycarboxylic acid water reducer and a naphthalenesulfonate formaldehyde water reducer, and alkylsulfonic acid-3-methylimidazole hydrogen sulfate is added to reduce the mutual entanglement of the water reducer molecular chains, thereby improving the dispersion performance of the water reducer in concrete and improving the fluidity of cement slurry. The water reducer composition combines the performance of the polycarboxylic acid water reducer and the naphthalenesulfonate formaldehyde water reducer, and improves the antifreeze performance of concrete.

[0027] 2. The water-reducing agent composition of the present invention includes a defoamer, which can effectively defoam the air entrained in the composition and improve the storage stability of the composition; the defoamer can also reduce the inferior bubbles in the concrete and improve the strength of the cement slurry.

[0028] 3. The present invention also provides a method for preparing a water reducer composition. First, alkyl sulfonic acid-3-methylimidazole hydrogen sulfate is reacted with a naphthalenesulfonate formaldehyde water reducer to allow the alkyl sulfonic acid-3-methylimidazole hydrogen sulfate to bind to the molecular chain of the naphthalenesulfonate formaldehyde water reducer. When a polycarboxylic acid water reducer is added, it is difficult for the molecular chain of the polycarboxylic acid water reducer to entangle around the naphthalenesulfonate formaldehyde water reducer, thereby improving fluidity.

[0029] 4. The present invention adds a certain amount of amino-polyethylene glycol-silane to concrete, which is beneficial to improving the frost resistance of concrete. This may be based on the following principles: the polyethylene glycol in the molecular structure of amino-polyethylene glycol-silane has a certain flexibility and 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, and improving the anti-permeability of the concrete, thereby reducing the risk of freeze-thaw damage to the concrete due to 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, so that the concrete forms a stable and dense structure, further improving its frost resistance, and ensuring that the concrete can still maintain good performance in a cold environment. DETAILED DESCRIPTION

[0030] The technical scheme of the present invention is further described below by specific embodiments. It should be understood that the specific embodiments described herein are only used to help understand the present invention and are not intended to be used for specific limitations of the present invention. Unless otherwise specified, 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.

[0031] The polycarboxylate water reducer is TK-101A polycarboxylate water reducer produced by Sichuan Tieke New Building Materials Co., Ltd., with a solid content of 46%; The naphthalenesulfonate formaldehyde water reducer is ASD-5 naphthalene-based high-efficiency water reducer produced by Pingdingshan Ausda Technology Co., Ltd., with a solid content of 40%; The defoamer was GPE defoamer purchased from Guangdong Nanhui New Materials Co., Ltd. 1-Butylsulfonic acid-3-methylimidazole hydrogen sulfate, 827320-59-2, Aladdin; 1-Butyl-3-methylimidazolium hydrogen sulfate, 262297-13-2, Aladdin; The cement is ordinary Portland cement of P·O 42.5 grade; The fly ash is Class II fly ash; Microsilica fume is produced by Shandong Boken Silicon Material Factory, with SiO2 content of 97.6%; Crushed stone: limestone crushed stone with a particle size range of 5~30.6mm, crushing index 8.8%; River sand: mud content is 1.5%, fineness modulus is 2.9; Amino-polyethylene glycol-silane is NH2-PEG-Silane from Ruixi Biotechnology, MW: 2000; Silane-polyethylene glycol-silane is Silane-PEG-Silane from Ruixi Biotechnology, MW: 2000. Example 1

[0032] The water reducer composition of this embodiment is: 60 parts by weight of polycarboxylic acid water reducer (solid weight part is 27.6), 40 parts by weight of naphthalenesulfonate formaldehyde water reducer (solid weight part is 16), 1.48 parts by weight of 1-butylsulfonic acid-3-methylimidazole hydrogen sulfate, and 0.01 parts by weight of defoamer.

[0033] The preparation method of the water reducer composition of this embodiment comprises the following steps: adding 1-butylsulfonic acid-3-methylimidazole hydrogen sulfate to naphthalenesulfonate formaldehyde water reducer, stirring at 300 rpm for 20 min, then adding polycarboxylic acid water reducer and defoamer and further stirring for 2 min to obtain the water reducer composition. Example 2

[0034] The water reducer composition of this embodiment is: 60 parts by weight of polycarboxylic acid water reducer (solid weight part is 27.6), 40 parts by weight of naphthalenesulfonate formaldehyde water reducer (solid weight part is 16), 1.48 parts by weight of 1-butylsulfonic acid-3-methylimidazole hydrogen sulfate, and 0.01 parts by weight of defoamer.

[0035] The preparation method of the water reducer composition of this embodiment comprises the following steps: mixing 1-butylsulfonic acid-3-methylimidazole hydrogen sulfate, naphthalenesulfonate formaldehyde water reducer, polycarboxylic acid water reducer and defoamer, stirring at 300 rpm for 20 min to obtain the water reducer composition. Example 3

[0036] The water reducer composition of this embodiment is: 60 parts by weight of polycarboxylic acid water reducer (solid weight part is 27.6), 40 parts by weight of naphthalenesulfonate formaldehyde water reducer (solid weight part is 16), 1.48 parts by weight of 1-butylsulfonic acid-3-methylimidazole hydrogen sulfate, and 0.01 parts by weight of defoamer.

[0037] The preparation method of the water reducer composition of this embodiment comprises the following steps: adding 1-butylsulfonic acid-3-methylimidazole hydrogen sulfate to a polycarboxylic acid water reducer, stirring at 300 rpm for 20 min, then adding a naphthalenesulfonate formaldehyde water reducer and a defoamer and further stirring for 2 min to obtain a water reducer composition.

[0038] Comparative Example 1 The water reducing agent composition of Comparative Example 1 is: 100 parts by weight of a polycarboxylic acid water reducing agent (46 parts by weight of solids), 1.48 parts by weight of 1-butylsulfonic acid-3-methylimidazole hydrogen sulfate, and 0.01 parts by weight of a defoamer.

[0039] The preparation method of the water reducer composition of Comparative Example 1 comprises the following steps: stirring 1-butanesulfonic acid-3-methylimidazole hydrogen sulfate, a polycarboxylic acid water reducer and a defoamer at 300 rpm for 20 min to obtain a water reducer composition.

[0040] Comparative Example 2 The water reducing agent composition of Comparative Example 2 is: 100 parts by weight of naphthalenesulfonate formaldehyde water reducing agent (solid weight part is 40), 1.48 parts by weight of 1-butylsulfonic acid-3-methylimidazole hydrogen sulfate, and 0.01 parts by weight of defoamer.

[0041] The preparation method of the water reducer composition of Comparative Example 2 comprises the following steps: stirring 1-butanesulfonic acid-3-methylimidazole hydrogen sulfate, naphthalenesulfonate formaldehyde water reducer and defoamer at 300 rpm for 20 min to obtain a water reducer composition.

[0042] Comparative Example 3 The water reducer composition of Comparative Example 3 is: 60 parts by weight of polycarboxylic acid water reducer (27.6 parts by weight of solid), 40 parts by weight of naphthalenesulfonate formaldehyde water reducer (16 parts by weight of solid), 0.01 parts by weight of defoamer, and 1.48 parts by weight of water.

[0043] The preparation method of the water reducer composition of Comparative Example 3 comprises the following steps: stirring a naphthalenesulfonate formaldehyde water reducer, a polycarboxylic acid water reducer, a defoamer and water at 300 rpm for 20 min to obtain a water reducer composition.

[0044] Comparative Example 4 The water reducer composition of Comparative Example 4 is: 60 parts by weight of polycarboxylic acid water reducer (27.6 parts by weight of solid), 40 parts by weight of naphthalenesulfonate formaldehyde water reducer (16 parts by weight of solid), 1.48 parts by weight of 1-butyl-3-methylimidazole hydrogen sulfate, and 0.01 parts by weight of defoamer.

[0045] The preparation method of the water reducer composition of Comparative Example 4 comprises the following steps: adding 1-butyl-3-methylimidazole hydrogen sulfate to naphthalenesulfonate formaldehyde water reducer, stirring at 300 rpm for 20 min, then adding polycarboxylic acid water reducer and defoamer and further stirring for 2 min to obtain a water reducer composition.

[0046] Application Example 1 The concrete formula of this application example is: 100g cement, 25g fly ash, 25g microsilica powder, 400g crushed stone, 500g river sand, 50g water, and 2.8g of the water reducing agent composition of Example 1.

[0047] Application Example 2 The concrete formula of this application example is: 100g cement, 25g fly ash, 25g microsilica powder, 400g crushed stone, 500g river sand, 50g water, and 2.8g of the water reducing agent composition of Example 2.

[0048] Application Example 3 The concrete formula of this application example is: 100g cement, 25g fly ash, 25g microsilica powder, 400g crushed stone, 500g river sand, 50g water, and 2.8g of the water reducing agent composition of Example 3.

[0049] Application Example 4 The concrete formula of this application example is: 100g cement, 25g fly ash, 25g microsilica powder, 400g crushed stone, 500g river sand, 50g water, 2.8g water reducer composition of Example 1, and 0.5g amino-polyethylene glycol-silane.

[0050] Application Example 5 The concrete formula of Application Example 5 is: 100g cement, 25g fly ash, 25g microsilica powder, 400g crushed stone, 500g river sand, 50g water, 2.8g water reducer composition of Example 1, and 0.5g silane-polyethylene glycol-silane.

[0051] Application Comparative Example 1 The concrete formula of Comparative Example 1 is: 100g cement, 25g fly ash, 25g microsilica powder, 400g crushed stone, 500g river sand, 50g water, and 1.2g polycarboxylic acid water reducer.

[0052] Application Comparative Example 2 The concrete formula of Comparative Example 2 is: 100g cement, 25g fly ash, 25g microsilica powder, 400g crushed stone, 500g river sand, 50g water, and 1.2g naphthalenesulfonate formaldehyde water reducer.

[0053] Application Comparative Example 3 The concrete formula of Comparative Example 3 is: 100g cement, 25g fly ash, 25g microsilica powder, 400g crushed stone, 500g river sand, 50g water, and 2.65g of the water reducing agent composition of Comparative Example 1.

[0054] Application Comparative Example 4 The concrete formula of Comparative Example 4 is: 100g cement, 25g fly ash, 25g microsilica powder, 400g crushed stone, 500g river sand, 50g water, and 3.04g of the water reducing agent composition of Comparative Example 2.

[0055] Application Comparative Example 5 The concrete formula of Comparative Example 5 is: 100g cement, 25g fly ash, 25g microsilica powder, 400g crushed stone, 500g river sand, 50g water, and 2.8g of the water reducing agent composition of Comparative Example 3.

[0056] Application Comparative Example 6 The concrete formula of Comparative Example 6 is: 100g cement, 25g fly ash, 25g microsilica powder, 400g crushed stone, 500g river sand, 50g water, and 2.8g of the water reducing agent composition of Comparative Example 4.

[0057] Weigh the raw materials of the concrete formula of application examples 1-5 and application comparative examples 1-6, pour the raw materials into the mixing pot of the mixer, mix evenly to obtain cement slurry, pour part of the cement slurry into a truncated cone circular mold, lift the truncated cone circular mold vertically, let the cement slurry flow naturally on the glass plate, measure the maximum diameter of the flowing slurry with a ruler as the recording data, and record the initial fluidity mm. The results are shown in Table 1.

[0058] The remaining cement slurry was loaded into the mold. At the same time, the concrete in the mold was compacted. Then the mold with concrete was moved to the concrete test mold vibrating table and vibrated 3 times, each time for 90 seconds. Concrete was continuously added to the mold during the process to keep the concrete filling the mold. The prepared concrete specimen was demoulded with the mold after curing in the air for 1 day, and then placed in the concrete curing box for curing. The strength of the concrete cured to the 28th day was tested, and the compressive strength of the concrete test block was tested using a constant stress pressure testing machine. Another group of specimens was taken to test the frost resistance of the concrete cured for 28 days, and the freeze-thaw cycler was used to test the test block for freeze-thaw cycles. The compressive strength after 100 freeze-thaw cycles was tested, and the compressive strength change rate was calculated as % = (original compressive strength - compressive strength after 100 freeze-thaw cycles) / original compressive strength * 100%. The results are shown in Table 1.

[0059] Table 1 Performance data of application examples and comparative examples

[0060] The water reducers added in Application Comparative Example 1 and Application Comparative Example 2 are polycarboxylic acid water reducer and naphthalenesulfonate formaldehyde water reducer, respectively. The water reducer added in Application Comparative Example 5 is a composite composition formed by polycarboxylic acid water reducer and naphthalenesulfonate formaldehyde water reducer. From the data comparison in Table 1, it can be seen that the composite addition of polycarboxylic acid water reducer and naphthalenesulfonate formaldehyde water reducer will reduce the fluidity of cement slurry due to the molecular entanglement of the two, and the compressive strength and frost resistance will also be reduced. From the comparison between Application Comparative Example 3 and Application Comparative Example 1, and the comparison between Application Comparative Example 4 and Application Comparative Example 2, it can be seen that the addition of 1-butylsulfonic acid-3-methylimidazole hydrogen sulfate to polycarboxylic acid water reducer or naphthalenesulfonate formaldehyde water reducer has no significant effect on fluidity. From the comparison between Application Example 5 and Application Example 1, it can be seen that when the polycarboxylic acid water reducer and the naphthalenesulfonate formaldehyde water reducer are compounded, the addition of 1-butylsulfonic acid-3-methylimidazole hydrogen sulfate is beneficial to avoid molecular chain entanglement, improve fluidity, and improve compressive strength and frost resistance in one step. Application Example 6 uses 1-butyl-3-methylimidazole hydrogen sulfate, which can improve fluidity relative to Application Example 5, but the improvement is not as good as 1-butylsulfonic acid-3-methylimidazole hydrogen sulfate. From the comparison between Application Function Example 2 and Application Example 3 and Application Example 1, it can be seen that reacting 1-butylsulfonic acid-3-methylimidazole hydrogen sulfate with the naphthalenesulfonate formaldehyde water reducer first is beneficial to avoid molecular entanglement and improve fluidity.

[0061] From the comparison between Application Example 4 and Application Example 1, it can be seen that adding amino-polyethylene glycol-silane to concrete is beneficial to improving the frost resistance of concrete. However, 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.

[0062] The various aspects, embodiments, and features of the present invention should be considered to be illustrative in all aspects and not limiting of the present invention, the scope of which is defined solely by the claims. Other embodiments, modifications, and uses will be apparent to those skilled in the art without departing from the spirit and scope of the claimed invention.

[0063] In the preparation method of the present invention, the order of each step is not limited to the order listed. For those skilled in the art, without creative work, the order of each step is also within the protection scope of the present invention. In addition, two or more steps or actions can be performed simultaneously.

[0064] Finally, it should be noted that the specific embodiments described herein are merely examples of the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art of the present invention may make various modifications or supplements to the specific embodiments described, or replace them in a similar manner. It is not necessary and impossible to provide all examples of all implementation methods here. However, these obvious changes or modifications derived from the essential spirit of the present invention still fall within the scope of protection of the present invention, and 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: Including polycarboxylic acid water reducer, naphthalene sulfonate formaldehyde water reducer, alkyl sulfonic acid-3-methylimidazole hydrogen sulfate and defoamer; The amount of alkylsulfonic acid-3-methylimidazole hydrogen sulfate added is 0.5 to 20 parts by weight relative to 100 parts by weight of the solid content in the polycarboxylic acid-based water-reducing agent and the naphthalenesulfonate formaldehyde water-reducing agent.

2. A water reducing agent composition according to claim 1, characterized in that: Both polycarboxylic acid water reducer and naphthalenesulfonate formaldehyde water reducer are liquids, the solid content of polycarboxylic acid water reducer is 30~70wt%, and the solid content of naphthalenesulfonate formaldehyde water reducer is 30~70wt%.

3. A water reducing agent composition according to claim 1 or 2, characterized in that: The mass ratio of the solid content of the polycarboxylic acid-based water-reducing agent to the solid content of the naphthalenesulfonate formaldehyde water-reducing agent is 40:60 to 90:

10.

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

5. A water reducing agent composition according to claim 1, characterized in that: The amount of alkylsulfonic acid-3-methylimidazole hydrogen sulfate added is 1 to 10 parts by weight, and the amount of the defoamer added is 0.001 to 1 part by weight, relative to 100 parts by weight of the solid content in the polycarboxylic acid-based water-reducing agent and the naphthalenesulfonate formaldehyde water-reducing agent.

6. The method for preparing a water reducing agent composition according to claim 1, characterized in that: The following steps are involved: Alkylsulfonic acid-3-methylimidazole hydrogen sulfate is added to the naphthalenesulfonate formaldehyde water reducer, stirred for 1 to 60 minutes, and then a polycarboxylic acid water reducer and a defoamer are added and further stirred to obtain a water reducer composition.

7. A concrete formula, characterized in that: The invention comprises cement, mineral admixture, coarse aggregate, fine aggregate, water and the water reducing agent composition according to claim 1, wherein the mass of the solid components of the polycarboxylic acid water reducing agent and the naphthalenesulfonate formaldehyde water reducing agent in the water reducing agent composition is 0.1-2wt% of the mass of the cement.

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

30.

9. A concrete formula according to claim 7, characterized in that: The concrete formulation also includes amino-polyethylene glycol-silane.

10. A concrete formula according to claim 9, characterized in that: The amino-polyethylene glycol-silane is added in an amount of 0.05-2 wt % of the cement; The molecular weight of the amino-polyethylene glycol-silane is 1000-10000.

Images