Concrete superplasticizing auxiliary agent as well as preparation method and application thereof
By using a combination of concrete superplasticizers, the problems of poor adaptability and low cement reduction rate in concrete have been solved, resulting in a significant reduction in cement usage and performance improvement. This has improved the fluidity, strength, and durability of concrete, which aligns with the concept of green and low-carbon development.
Patent Information
- Application Number
- CN202511350955.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-22
- Publication Date
- 2025-11-18
AI Technical Summary
Existing concrete has problems such as poor adaptability to different materials, low cement reduction rate, poor later strength growth, and even strength shrinkage. Moreover, existing technologies cannot significantly reduce cement usage while ensuring concrete performance.
The superplasticizing agent for concrete utilizes the synergistic effect of components such as complex polysaccharides, polymeric polyols, polyol amines, inorganic salts, and urea to form a multi-hydroxyl three-dimensional adsorption structure, thereby improving the dispersion ability and hydration degree of cementitious materials. Combined with the competitive adsorption characteristics of polyethylene glycol, it enhances the fluidity and strength of concrete. Furthermore, the excellent three-dimensional network adsorption structure formed by polyvinyl alcohol further improves the dispersion effect.
It significantly increases the cement reduction rate, improves the workability and mechanical properties of concrete, reduces cement usage, reduces through-pores, inhibits surface sanding, improves freeze-thaw resistance and carbonation resistance, avoids strength shrinkage, and ensures construction quality and environmental friendliness.
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Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of concrete admixtures, and is mainly applied to cement concrete mixed with water reducing agent, and particularly relates to a concrete superplasticizer, a preparation method and application thereof. BACKGROUND
[0002] Concrete is a mixture prepared by mixing and stirring cementitious materials (cement, fly ash, and mineral powder and other mineral admixtures), coarse aggregate, fine aggregate, water, and admixtures in a certain proportion, and is a building material with a very large usage. Under the premise that the concrete industry gradually develops in the direction of green, low carbon, and environmental protection, how to improve the quality and efficiency of concrete and save energy and reduce consumption is of great significance to the sustainable development of the concrete industry. A large number of studies at home and abroad have shown that 20-30% of cement particles in concrete are not fully dispersed and hydrated under conventional curing conditions, and only play a role in micro-aggregate filling, which cannot fully play the cementing role of cement, thus greatly increasing the cost of concrete and having a great negative impact on the long-term performance of concrete. According to the information collected that the average level of cementitious material usage of ready-mixed concrete in China is generally about 60-70 kg / m3 higher than that in developed countries such as Europe and the United States, it is feasible to develop a concrete admixture agent that can further reduce the cement content by improving the dispersing capacity when used with water reducing agent through technological innovation. The developed concrete admixture agent should also consider the performance of different regional material capabilities, which is of great significance to ensure the quality and safety of ready-mixed concrete and widespread application. SUMMARY
[0003] The main purpose of the present application is to solve the problems and deficiencies of the prior art, such as poor adaptability to different materials, low cement reduction rate, poor late strength growth, and even strength reversal, and to provide a concrete superplasticizer that can effectively ensure the working performance and mechanical properties of the obtained concrete to be improved compared with the prior art level under the premise of significantly improving the cement reduction rate and adaptability, and the preparation method is simple, environmentally friendly, and suitable for popularization and application.
[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: The concrete superplasticizer is prepared from the following components and their mass percentages: 20-40% of composite polyose, 10-30% of polyhydric alcohol, 6-12% of polyhydric alcohol amine, 0-3% of polyvinyl alcohol, 3-7% of inorganic salt, 0-3% of urea, and the balance of water; the composite polyose is composed of 2-3 kinds of maltose, oligomeric isomaltulose and molasses; the polyhydric alcohol is composed of 3-4 kinds of diethylene glycol, propylene glycol, glycerol and polyethylene glycol; the polyhydric alcohol amine is composed of 1-3 kinds of triethanolamine, diethanol mono-isopropanolamine and monoethanol di-isopropanolamine; and the inorganic salt is composed of 1-4 kinds of anhydrous sodium sulfite, sodium sulfate, sodium tripolyphosphate and sodium hexametaphosphate.
[0005] In the above scheme, the mass ratio of maltose, oligomeric isomaltulose and molasses in the composite polyose is 1:(0.32-0.50):(0.00-0.18); the mass ratio of diethylene glycol, propylene glycol, glycerol and polyethylene glycol in the polyhydric alcohol is 1:(0.00-0.18):(0.42-0.60):(0.10-0.28); the mass ratio of triethanolamine, diethanol mono-isopropanolamine and monoethanol di-isopropanolamine in the polyhydric alcohol amine is 1:(0.00-0.18):(0.00-0.18); and the mass ratio of anhydrous sodium sulfite, sodium sulfate, sodium tripolyphosphate and sodium hexametaphosphate in the inorganic salt is 1:(0.00-0.18):(0.00-0.18):(0.00-0.18).
[0006] Preferably, the content of the maltose is ≥75wt%.
[0007] Preferably, the IMO content of the oligomeric isomaltulose is ≥90wt%.
[0008] Preferably, the molasses is TH12-26, and the content is ≥65wt%.
[0009] Preferably, the average molecular weight of the polyethylene glycol is 800, 1000 or 1200, and the content is ≥99.5wt%.
[0010] Preferably, the polyvinyl alcohol has a polymerization degree of 1700 and an alcoholysis degree of 88%, and the content is ≥99.9wt%.
[0011] In the above scheme, the effective substance content of the diethylene glycol is ≥99.5wt%.
[0012] In the above scheme, the effective substance content of the propylene glycol is ≥99.5wt%.
[0013] In the above scheme, the effective substance content of the glycerol is ≥99.5wt%.
[0014] In the above scheme, the effective substance content of the triethanolamine is ≥99.5wt%.
[0015] In the above scheme, the effective content of the diethanol mono-isopropanol amine is ≥ 85wt%.
[0016] In the above scheme, the effective content of the mono-ethanol di-isopropanol amine is ≥ 85wt%.
[0017] In the above scheme, the effective content of the anhydrous sodium sulfite is ≥ 99.5wt%.
[0018] In the above scheme, the effective content of the sodium sulfate is ≥ 99.5wt%.
[0019] In the above scheme, the effective content of the sodium tripolyphosphate is ≥ 99.5wt%.
[0020] In the above scheme, the effective content of the sodium hexametaphosphate is ≥ 99.5wt%.
[0021] In the above scheme, the effective content of the urea is ≥ 99.5wt%.
[0022] In the above scheme, the effective solid content of the concrete superplasticizer is 45-65wt%.
[0023] The preparation method of the above concrete superplasticizer comprises the following steps: 1) The components are weighed according to the proportion, and the mass percentage of each component is as follows: 20-40% of composite polyol, 10-30% of polyol, 6-12% of polyol amine, 0-3% of polyvinyl alcohol, 3-7% of inorganic salt, 0-3% of urea, and the balance is water; 2) All the weighed water is first added to the stirring tank, and then the weighed polyvinyl alcohol is slowly added to the water in a dispersed manner while stirring, and the stirring is continued until a uniform transparent and completely dissolved polyvinyl alcohol aqueous solution is obtained.
[0024] 3) The weighed composite polyol, polyol, polyol amine, inorganic salt and urea are all added to the above polyvinyl alcohol aqueous solution in a manner of stirring while adding, and the stirring is continued until a uniform concrete superplasticizer without stratification and uniform color is obtained. The stirring temperature is 15-45℃, and the stirring time is 2-3h.
[0025] The concrete superplasticizer obtained according to the above scheme can be directly mixed into concrete, diluted with water to obtain a working solution, or mixed into concrete in the form of a composite with a water reducing agent.
[0026] Preferably, the amount of the concrete superplasticizer mother liquor directly mixed into the concrete is 0.04-0.06wt% of the amount of cementitious materials.
[0027] Preferably, the working liquid is incorporated into the concrete in an amount of 0.9-1.2wt% of the amount of cementitious material.
[0028] Preferably, the mass ratio of the water reducing agent to the concrete superplasticizer mother liquor is 1:(0.01-0.03); the amount of superplasticizer mother liquor incorporated into the concrete is 0.04-0.06% of the amount of cementitious material.
[0029] The principle of the present application is: 1) The present application is designed by combining the theories of full dispersion and synergistic dispersion, and realizes the dispersion of fine cementitious structures that cannot be dispersed by strong dispersion water reducing agents by using the comprehensive idea of combining multi-hydroxy adsorption, chelation, catalysis, competitive adsorption and water-based micro-film lubrication, so as to make the cementitious material particles fully hydrated as much as possible, and to achieve the purpose of significantly reducing the amount of cementitious material under the premise of ensuring not less than the working performance and mechanical properties of the reference concrete; 2) The present application uses multiple sugars with different molecular weights and molecular structures in combination and adjusts their blending ratio, which can form a better multi-hydroxy three-dimensional space adsorption structure, has a certain effect of improving dispersion capacity, and thus plays a promoting role in improving the fluidity and strength of concrete, and maltose has an excellent effect of inhibiting the surface sanding of concrete; 3) The present application introduces polyhydric alcohol and polyhydric alcohol amine into the system of composite multiple sugars and adjusts their blending ratio, which can form a better multi-hydroxy three-dimensional space adsorption structure, and under the joint action, it can play a role in further improving the dispersion capacity, thereby playing a promoting role in further improving the fluidity and strength of concrete; 4) The present application limits the amount of triethanolamine to a lower level, so that it can play a role of catalyst in the hydration process to improve the hydration degree of cement; 5) The present application introduces inorganic salt into the system of polyhydric sugar, polyhydric alcohol and polyhydric alcohol amine, which can further improve the microstructure of hydrates and thus improve the density and strength of concrete, and the reducing property of anhydrous sodium sulfite can also play a role in protecting the molecular structure of composite multiple sugars; 6) The present application introduces an appropriate amount of urea into the system of polyhydric sugar, polyhydric alcohol, polyhydric alcohol amine and inorganic salt to improve the ammonium ion density of the system, which can further improve the dispersion capacity of cement under the chelation of ammonium ions, and urea also has a positive effect on improving the frost resistance of concrete and the anti-corrosion capacity of steel bars; 7) The invention in the polymeric polyol, polyol amine, inorganic salt and urea system by introducing the appropriate amount of polyethylene glycol as a sacrificial agent, using its competitive adsorption characteristics to reduce the aggregate surface micro-cracks on the adsorption of water reducing agent, so that the water reducing agent can participate in the dispersion of cementitious materials as much as possible to improve the dispersion effect, practice has proved that the introduction of appropriate amount of polyethylene glycol can also significantly improve the adhesion and significantly improve the compressive strength of concrete; 8) The invention in the polymeric polyol, polyol amine, inorganic salt, urea and polyethylene glycol system by introducing the appropriate amount of polyvinyl alcohol (PVA-1788), using its good water solubility, strong dispersion, lubricity, adhesion and the advantage of forming a more excellent space stereo network adsorption structure with the above system, to further improve the dispersion effect; 9) The invention by using a combination of composite maltose, polyethylene glycol, polyvinyl alcohol and urea, so that the concrete superplasticizer has excellent ability to adapt to different materials in different regions.
[0030] Compared with the prior art, the beneficial effects of the present invention are as follows: 1) The concrete superplasticizer of the present invention has a significant advantage of reducing the cement content by 15-19%, compared with the prior art of 6-8%. Under the premise of significantly improving the cement content and improving the adaptability, the working performance and mechanical properties of the obtained concrete can be effectively improved compared with the prior art level, which has good economic and social benefits.
[0031] 2) The concrete superplasticizer of the present invention can improve the working performance and mechanical properties of concrete without reducing the cement content, and can be used to prepare higher performance concrete.
[0032] 3) The concrete superplasticizer of the present invention can effectively solve the problems of concrete sticking, drying, grabbing, poor flowability and easy cracking.
[0033] 4) The concrete superplasticizer of the present invention can significantly reduce the through capillary pores connected to the surface, thereby reducing the invasion of external free water and carbon dioxide into the concrete, and further reducing the risk of concrete erosion.
[0034] 5) The concrete superplasticizer of the present invention can effectively inhibit the sanding of the concrete surface, enhance the protective effect of the concrete surface layer on the structure, and improve the carbonation resistance and frost resistance of the concrete, which has a positive significance for prolonging the service life of the concrete and improving the corrosion resistance of the steel.
[0035] 6)Utilize the concrete superplasticizer of the application, by limiting the amount of triethanolamine to make it only play a catalytic role in the hydration process, rather than early strength effect, thereby avoiding the quality risk of poor late strength growth or even strength reverse caused by using triethanolamine as early strength agent.
[0036] 7)Utilize the concrete superplasticizer of the application, can ensure the normal growth of concrete late strength after 28 days, and will not appear the quality risk of no growth or even strength reverse after 28 days; when applied to high-grade concrete, it can even improve the late strength growth ability of concrete.
[0037] 8)The concrete superplasticizer of the application mainly plays a synergistic dispersion role with water reducing agent, which can significantly reduce the level of concentrated release of early hydration heat of concrete under the premise of greatly reducing the amount of cementitious material in concrete, which has a positive significance for inhibiting concrete temperature cracks.
[0038] 9)The concrete superplasticizer of the application can achieve the expected effect through random sampling test in many provinces in China, which proves that it has strong adaptability to different materials in different regions.
[0039] 10)Utilize the concrete superplasticizer of the application, the setting time of concrete is slightly prolonged, which will not cause the phenomenon of accelerated setting or excessive retarding setting of concrete, thereby ensuring the construction quality and safety of concrete.
[0040] 11)Utilize the concrete superplasticizer of the application, it can be compounded with various water reducing agents commonly used on the market to obtain higher performance water reducing agent with significantly improved water reducing rate.
[0041] 12)The concrete superplasticizer of the application is highly compatible with various water reducing agents commonly used on the market, can be fully dissolved without side effects, and has wide application range.
[0042] 13)The concrete superplasticizer of the application does not contain harmful substances such as chlorine and alkali, and will not cause alkali-aggregate reaction.
[0043] 14)The concrete superplasticizer of the application can be prepared at room temperature, and the preparation process is zero emission of pollutants and friendly to the environment. A small amount of addition in concrete can significantly reduce the amount of cementitious material under the premise of ensuring the working performance and mechanical properties of concrete, which meets the development concept of green and low carbon. DETAILED DESCRIPTION
[0044] In order to make the technical scheme of the application more clear and understandable, the application will be further described in detail below in combination with embodiments. Obviously, the described embodiments are only a part of the embodiments of the application, not all the embodiments of the application, and are not used to limit the application.
[0045] The maltose content in the following examples is >75wt%; the IMO content of oligomaltose is >90wt%; the molasses is TH12-26, the content is >65wt%; the effective content of diethylene glycol is >99.5wt%; the effective content of propylene glycol is >99.5wt%; the effective content of glycerol is >99.5wt%; the average molecular weight of polyethylene glycol is 1000, the effective content is >99.5wt%; the effective content of triethanolamine is >99.5wt%; the effective content of diethanol mono-isopropanolamine is >85wt%; the effective content of monoethanol di-isopropanolamine is >85wt%; the degree of polymerization of polyvinyl alcohol is 1700, the alcoholysis degree is 88%, the content is >99.9%; the effective content of anhydrous sodium sulfite is >99.5wt%; the effective content of sodium sulfate is >99.5wt%; the effective content of sodium tripolyphosphate is >99.5wt%; the effective content of sodium hexametaphosphate is >99.5wt%; the effective content of urea is >99.5wt%. Example 1
[0046] A concrete superplasticizer, the preparation method thereof comprises the following steps: 1) the components are weighed according to the proportion, and the mass percentage of each component is as follows: 20-40% of composite polyol, 10-30% of polyol, 6-12% of polyol amine, 0-3% of polyvinyl alcohol, 3-7% of inorganic salt, 0-3% of urea, and the balance is water; 2) all the weighed water is first added into a stirring tank, and then the weighed polyvinyl alcohol is slowly added into the water in a dispersed manner while stirring, and the stirring is continued until a uniform and transparent polyvinyl alcohol aqueous solution is obtained; 3) the weighed composite polyol, polyol, polyol amine, inorganic salt and urea are all added into the above polyvinyl alcohol aqueous solution in a manner of stirring and adding, and the stirring is continued until a uniform concrete superplasticizer without stratification and with consistent color is obtained. The stirring temperature is 15-45°C, and the stirring time is 2.5h. Example 2
[0047] The preparation method of this example is basically the same as that of example 1, except that the mass percentage of each component is as follows: 30% of composite polyol, 20% of polyol, 9% of polyol amine, 2% of polyvinyl alcohol, 5% of inorganic salt, 2% of urea, and the balance is deionized water. Example 3
[0048] The preparation method of this example is basically the same as that of example 1, except that the mass percentage of each component is as follows: 38% of composite polyol, 28% of polyol, 12% of polyol amine, 2% of polyvinyl alcohol, 6% of inorganic salt, 2% of urea, and the balance is deionized water. Example 4
[0049] The preparation method of this embodiment is substantially the same as that of embodiment 1, except that the components and their mass percentages are as follows: composite polyol 30%, polyol 18%, polyol amine 9%, polyvinyl alcohol 2%, inorganic salt 5%, urea 2%, and the balance is deionized water. Example 5
[0050] The preparation method of this embodiment is substantially the same as that of embodiment 1, except that the components and their mass percentages are as follows: composite polyol 30%, polyol 18%, polyol amine 9%, polyvinyl alcohol 2%, inorganic salt 5%, urea 2%, and the balance is deionized water. Application example
[0051] The concrete superplasticizer obtained in examples 1-5 is added to the concrete in one of the following three optional ways: The first way: the above concrete superplasticizer mother liquor is directly mixed into the concrete at a dosage of 0.05% of the amount of cementitious materials; The second way: the above concrete superplasticizer mother liquor is diluted with water in proportion to obtain a working solution, and the working solution is mixed into the concrete at a dosage of 1.0% of the amount of cementitious materials; The third way: 0.16 kg of the above concrete superplasticizer is mixed into 7.5 kg of polycarboxylic acid water reducer to obtain a modified polycarboxylic acid water reducer; the modified polycarboxylic acid water reducer is mixed into the concrete at a dosage of 1.8-2.5% of the amount of cementitious materials.
[0052] The application effect of the concrete superplasticizer of examples 1-5 in C30 and C50 concrete is tested, and the second way in the application example is used to mix into the concrete; two similar products on the market are randomly selected as comparative example 1 and comparative example 2. The concrete mix proportion is shown in table 1, the test results of the concrete work performance are shown in table 2, the test results of the concrete setting time are shown in table 3, and the test results of the concrete mechanical properties are shown in table 4.
[0053] Table 1 Concrete mix proportion
[0054] Table 2 Test results of concrete work performance
[0055] Table 3 Test results of concrete setting time
[0056] Table 4 Test results of concrete mechanical properties
[0057] From the data in Table 1-4, it can be seen that the concrete obtained by incorporating the concrete superplasticizer of the embodiments 1-5 of the present application has the following advantages compared with the reference concrete: (1) the workability of the concrete mixture is obviously improved, especially in the aspect of the concrete spread; (2) the setting time of the concrete is slightly longer than that of the reference concrete, and no accelerating or excessive retarding phenomenon occurs; (3) the 7d, 28d and 60d compressive strengths of the concrete are not lower than or even obviously higher than those of the reference concrete; (4) the contribution to the reduction of carbon emissions is calculated. Due to its excellent adaptability and wide adaptation region, the amount of cement can be reduced by 55-91 kg per cubic C30-C50 concrete, and the amount of carbon emissions can be reduced by (55-91) / 1000*634 / 1000*100000000 / 10000=348.7-576.9 million tons per billion cubic meters, based on the application of 1 billion cubic meters of concrete and the amount of carbon emissions of 634 Kg per ton of cement produced.
[0058] From the data in Table 1-4, it can be seen that the concrete obtained by incorporating the concrete superplasticizer of the embodiments 1-5 of the present application has the following advantages compared with the reference concrete: (1) the workability of the concrete mixture is obviously improved, especially in the aspect of the concrete spread; (2) the setting time of the concrete is slightly longer than that of the reference concrete, and no accelerating or excessive retarding phenomenon occurs; (3) the 7d, 28d and 60d compressive strengths of the concrete are not lower than or even obviously higher than those of the reference concrete; (4) the contribution to the reduction of carbon emissions is calculated. Due to its excellent adaptability and wide adaptation region, the amount of cement can be reduced by 55-91 kg per cubic C30-C50 concrete, and the amount of carbon emissions can be reduced by (55-91) / 1000*634 / 1000*100000000 / 10000=348.7-576.9 million tons per billion cubic meters, based on the application of 1 billion cubic meters of concrete and the amount of carbon emissions of 634 Kg per ton of cement produced. 3 3 3 3 3 The calculated reducible carbon emission is (30-38) / 1000*634 / 1000*100000000 / 10000=190.2-240.9 million tons / billion cubic meters, combined with the reducible carbon emission 348.7-576.9 million tons / billion cubic meters of the example, the increase of the example compared with the comparative example is: [(348.7-190.2) / 190.2-(576.9-240.9) / 240.9]*100%=83.3-139.5%.
[0059] Obviously, the described embodiments are only a part of the embodiments of the present application but not all the embodiments, and are not limited to the embodiments. Without enumerating all the embodiments, other different forms of changes or variations can be made by those skilled in the art based on the above description, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.
Claims
1. A concrete superplasticizing agent, characterized in that, The components and their mass percentages are as follows: 20-40% complex polysaccharides, 10-30% polymeric polyols, 6-12% polyol amines, 0-3% polyvinyl alcohol, 3-7% inorganic salts, 0-3% urea, and the balance being water; the complex polysaccharides are composed of 2-3 of maltose, isomaltooligosaccharides, and molasses; the polymeric polyols are composed of 3-4 of diethylene glycol, propylene glycol, glycerol, and polyethylene glycol; the polyol amines are composed of 1-3 of triethanolamine, diethanolamine, and diisopropanolamine; and the inorganic salts are composed of 1-4 of anhydrous sodium sulfite, sodium sulfate, sodium tripolyphosphate, and sodium hexametaphosphate.
2. The concrete superplasticizing agent according to claim 1, characterized in that, The mass ratio of maltose, isomaltooligosaccharide, and molasses in the complex polysaccharide is 1:(0.32-0.50):(0.00-0.18); the mass ratio of diethylene glycol, propylene glycol, glycerol, and polyethylene glycol in the polymeric polyol is 1:(0.00-0.18):(0.42-0.60):(0.10-0.28); the mass ratio of triethanolamine, diethanol monoisopropanolamine, and monoethanol diisopropanolamine in the polyol amine is 1:(0.00-0.18):(0.00-0.18); and the mass ratio of anhydrous sodium sulfite, sodium sulfate, sodium tripolyphosphate, and sodium hexametaphosphate in the inorganic salt is 1:(0.00-0.18):(0.00-0.18):(0.00-0.18).
3. The concrete superplasticizing agent according to claim 1, characterized in that, The effective solid content of the concrete superplasticizing additive is 45-65 wt%, and its binder reduction rate is 15-19%, which increases with the increase of concrete grade.
4. The concrete superplasticizing agent according to claim 1, characterized in that, By using a combination of compound maltose, polyethylene glycol, polyvinyl alcohol, and urea, the concrete superplasticizing additive possesses excellent dispersibility and adaptability to different materials in different regions.
5. The method for preparing the concrete superplasticizing agent according to any one of claims 1-4, characterized in that, Includes the following steps: 1) Weigh each component according to the ratio. The components and their mass percentages are as follows: 20-40% complex polysaccharide, 10-30% polymeric polyol, 6-12% polyol amine, 0-3% polyvinyl alcohol, 3-7% inorganic salt, 0-3% urea, and the remainder is water. 2) First, add all the weighed water into the mixing tank, then slowly add the weighed polyvinyl alcohol into the water in a dispersed manner while stirring, and continue stirring until a uniform, transparent, and completely dissolved polyvinyl alcohol aqueous solution is obtained. 3) Add the weighed complex polysaccharide, polymeric polyol, polyol amine, inorganic salt and urea to the above polyvinyl alcohol aqueous solution while stirring, and continue stirring until a uniform, non-layered, and colorless concrete superplasticizing additive is obtained.
6. The concrete superplasticizing agent according to claim 5, characterized in that, The stirring process is carried out at a temperature of 15-45℃ for 2-3 hours.
7. The application of the concrete superplasticizing additive according to any one of claims 1-4 or the concrete superplasticizing additive prepared by the preparation method according to any one of claims 5-6 in concrete, characterized in that, The concrete superplasticizing agent is incorporated into the concrete by direct addition, dilution with water to obtain a working solution and then adding it, or compounding it with a water-reducing agent.
8. The application according to claim 7, characterized in that, The amount of the concrete superplasticizing additive mother liquor directly added to the concrete is 0.04-0.06 wt% of the amount of cementitious material.
9. The application according to claim 7, characterized in that, The mass ratio of the water-reducing agent to the concrete superplasticizing agent mother liquor is 1:(0.01-0.03); the amount of superplasticizing agent mother liquor added to the concrete is 0.04-0.06% of the amount of cementitious material.