High-strength concrete admixture and method for preparing the same

Abstract

The application discloses a high-strength concrete admixture and a preparation method thereof. The high-strength concrete admixture is used for high-strength concrete with cement as a single cementing material, and is composed of a copolymer of polyethylene glycol monoisoprene ether and acrylic acid, hydroxyethyl acrylate and maleic anhydride, a retarder and water. The application solves the problem of complex production process of the domestic and foreign admixtures for preparing the high-strength concrete in Ethiopia.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete preparation, in particular to a high-strength concrete admixture and a preparation method thereof. BACKGROUND

[0002] Concrete admixture is mixed in the process of mixing concrete, which is used to improve the performance of fresh and hardened concrete, and has become an indispensable part of modern concrete. The main function of concrete admixture is to reduce water consumption, save cementitious materials, improve strength, improve workability, prolong durability, and improve economic benefits.

[0003] Ethiopia is located in the northeast of Africa, and the main industry is agriculture and animal husbandry. The industrial foundation is very weak. Its capital is Addis Ababa, which is the headquarters of the African Union and the United Nations Economic Commission for Africa. In recent years, with the vigorous development of the local economy, high-rise buildings are more and more common, and the building height is getting higher and higher. High-strength concrete has been gradually applied in construction engineering. However, the local concrete raw materials are scarce, and the quality is general and unstable. Among them, the admixture is mainly in the form of powdery naphthalene series and lignosulfonate, which seriously restricts the production and engineering application of high-strength concrete.

[0004] In the concrete in which most of the existing domestic admixtures are applied, there are various cementitious materials. Various cementitious materials can form a dense filling and complementary advantage in particle size distribution, thereby improving the fluidity of concrete and improving the strength of concrete. In the Ethiopian region, there is no fly ash, mineral powder, and super-fine powder, and the highest grade of cement is only OPC42.5, and the quality is unstable, and the age of the mortar strength is lower than that in China, and the 28d mortar average strength is 46-48Mpa. In the cementitious system of concrete, it is difficult to form a super-fine particle dense filling (DSP) system, and because the cement strength is low, the water-cement ratio of high-grade concrete is very low, thereby forming the problem of large plastic viscosity, insufficient fluidity, and easy to harden work performance. In addition, the synthesis of domestic admixture involves more than ten kinds of monomers, and the process is complex, which is not suitable for the synthesis and engineering application of admixture in areas with weak process. SUMMARY

[0005] In order to overcome the defects of the prior art, a high-strength concrete admixture and a preparation method thereof are provided to solve the problem of complex production process of domestic admixture for preparing high-strength concrete in Ethiopia.

[0006] In order to achieve the above-mentioned purpose, a high-strength concrete admixture is provided, which is used for high-strength concrete with cement as a single cementitious material, and the high-strength concrete admixture is composed of a copolymer of polyethylene glycol monoisoprene ether and acrylic acid, hydroxyethyl acrylate, and maleic anhydride, a retarder, and water.

[0007] Furthermore, the retarder is sodium gluconate.

[0008] This invention provides a method for preparing a high-strength concrete admixture, comprising the following steps:

[0009] The first solution is obtained by dissolving 1.5 parts by weight of mercaptopropionic acid and 1.5 parts by weight of vitamin C in 180 parts by weight of water.

[0010] A second solution is obtained by dissolving 75 parts by weight of acrylic acid in 180 parts by weight of water;

[0011] Dissolve 710 parts by weight of polyethylene glycol monoisoprene ether in 700 parts by weight of water, and then add 5 parts by weight of hydrogen peroxide to obtain the first base solution.

[0012] Simultaneously, the first solution and the second solution are added dropwise to the first base solution at a uniform rate and kept warm for 1.5 hours to obtain the first mother liquor;

[0013] A third solution is obtained by dissolving 1.5 parts by mass of mercaptopropionic acid and 1.5 parts by mass of vitamin C in 160 parts by mass of water.

[0014] A fourth solution is obtained by dissolving 35 parts by weight of acrylic acid and 80 parts by weight of hydroxyethyl acrylate in 180 parts by weight of water.

[0015] Dissolve 700 parts by weight of polyethylene glycol monoisoprene ether in 700 parts by weight of water, then add 5 parts by weight of hydrogen peroxide to obtain the second base solution.

[0016] Simultaneously, the third solution and the fourth solution are added dropwise to the second base solution at a uniform rate and kept warm for 1.5 hours to obtain the second mother liquor;

[0017] Dissolve 1.5 parts by mass of mercaptopropionic acid in 160 parts by mass of water to obtain the fifth solution;

[0018] Dissolve 3.5 parts by mass of vitamin C in 180 parts by mass of water to obtain the sixth solution;

[0019] Dissolve 65 parts by mass of maleic anhydride in 150 parts by mass of water to obtain the seventh solution;

[0020] Dissolve 750 parts by weight of polyethylene glycol monoisoprene ether in 700 parts by weight of water, then add the seventh solution and stir until homogeneous, then add 9.5 parts by weight of hydrogen peroxide to obtain the third base solution.

[0021] Simultaneously, the fifth solution and the sixth solution are uniformly added dropwise to the third base solution and kept warm for 1 hour to obtain the third mother liquor;

[0022] Add 28 parts by weight of retarder to 332 parts by weight of water to obtain retarded liquid;

[0023] A high-strength concrete admixture is prepared by sequentially adding 100-200 parts by weight of the first mother liquor, 140-150 parts by weight of the second mother liquor, and 290-400 parts by weight of the third mother liquor to the retarding liquid and stirring evenly.

[0024] Furthermore, the hydrogen peroxide has a mass concentration of 27.5%.

[0025] Furthermore, the insulation temperature of the first base liquid is 60±5℃.

[0026] Furthermore, the insulation temperature of the second base liquid is 50±5℃.

[0027] Furthermore, the insulation temperature of the third base liquid is 45±5℃.

[0028] The beneficial effects of this invention are that the production process of the high-strength concrete admixture is simple. Its use in high-strength concrete with cement as the sole binder weakens the surface force connection between cementitious particles, reduces the stress field of viscous substances, increases fluidity, improves aggregate encapsulation, results in good concrete uniformity, reduces slump time, and increases the strength of concrete at maturity. In contrast, local Ethiopian naphthalene-based water-reducing agents have low water-reducing rates. In comparative studies, it was found that a significant increase in admixture dosage was needed to further improve slump, resulting in significant slump loss over time and higher concrete viscosity, which is inconvenient for pumping.

[0029] The high-strength concrete admixture of this invention primarily adsorbs cement particles through a graft copolymer gear-shaped adsorption. The electrostatic repulsion between particles in the high-strength concrete admixture is three-dimensional, resulting in a greater dispersion effect. The interaction between the high-strength concrete admixture and the cement particle adsorption layer is a three-dimensional electrostatic repulsion, with minimal potential change and good plasticity retention over time. Attached Figure Description

[0030] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0031] Figure 1 This is a schematic diagram of the adsorption morphology of cement particles by the high-strength concrete admixture in an embodiment of the present invention.

[0032] Figure 2 This is a schematic diagram showing the adsorption morphology of cement particles by the naphthalene-based water-reducing agent in the comparative example of this invention. Detailed Implementation

[0033] The present application will now be described in further detail with reference to the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit the invention.

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present application will now be described in detail with reference to the embodiments.

[0035] This invention provides a high-strength concrete admixture for use in high-strength concrete with cement as the sole binder.

[0036] Specifically, the high-strength concrete admixture of the present invention is composed of copolymers of polyethylene glycol monoisoprene ether with acrylic acid, hydroxyethyl acrylate, and maleic anhydride, a retarder, and water.

[0037] In this embodiment, the retarder is sodium gluconate.

[0038] This invention provides a method for preparing a high-strength concrete admixture, comprising the following steps:

[0039] S1. Dissolve 1.5 parts by mass of mercaptopropionic acid and 1.5 parts by mass of vitamin C in 180 parts by mass of water to obtain the first solution.

[0040] S2. Dissolve 75 parts by mass of acrylic acid in 180 parts by mass of water to obtain a second solution.

[0041] S3. Dissolve 710 parts by weight of polyethylene glycol monoisoprene ether in 700 parts by weight of water, and then add 5 parts by weight of hydrogen peroxide (mass concentration of 27.5%) to obtain the first base solution.

[0042] S4. Simultaneously, the first solution and the second solution are added dropwise to the first base solution at a uniform rate and kept warm for 1.5 hours to obtain the first mother liquor.

[0043] The insulation temperature of the first base liquid is 60±5℃.

[0044] S5. Dissolve 1.5 parts by mass of mercaptopropionic acid and 1.5 parts by mass of vitamin C in 160 parts by mass of water to obtain a third solution.

[0045] S6. Dissolve 35 parts by mass of acrylic acid and 80 parts by mass of hydroxyethyl acrylate in 180 parts by mass of water to obtain a fourth solution.

[0046] S7. Dissolve 700 parts by weight of polyethylene glycol monoisoprene ether in 700 parts by weight of water, then add 5 parts by weight of hydrogen peroxide (mass concentration of 27.5%) to obtain the second base solution.

[0047] S8. Simultaneously, the third and fourth solutions are added dropwise to the second base solution at a uniform rate and kept warm for 1.5 hours to obtain the second mother liquor.

[0048] The insulation temperature of the second base liquid is 50±5℃.

[0049] S9. Dissolve 1.5 parts by mass of mercaptopropionic acid in 160 parts by mass of water to obtain the fifth solution.

[0050] S10. Dissolve 3.5 parts by mass of Vc in 180 parts by mass of water to obtain the sixth solution.

[0051] S11. Dissolve 65 parts by mass of maleic anhydride in 150 parts by mass of water to obtain the seventh solution.

[0052] S12. Dissolve 750 parts by weight of polyethylene glycol monoisoprene ether in 700 parts by weight of water, then add the seventh solution and stir evenly. Finally, add 9.5 parts by weight of hydrogen peroxide (mass concentration of 27.5%) to obtain the third base solution.

[0053] S13. Simultaneously, the fifth and sixth solutions are uniformly added dropwise to the third base solution and kept warm for 1 hour to obtain the third mother liquor.

[0054] The insulation temperature of the third base liquid is 45±5℃.

[0055] S14. Add 28 parts by weight of retarder to 332 parts by weight of water to obtain retarder solution.

[0056] S15. 100-200 parts by weight of the first mother liquor, 140-150 parts by weight of the second mother liquor, and 290-400 parts by weight of the third mother liquor are added to the retarding liquid in sequence and stirred evenly to obtain a high-strength concrete admixture.

[0057] The high-strength concrete admixture of the present invention is based on the simple and easy-to-purchase admixture synthesis monomers, and can synthesize a variety of functional admixture mother liquors. By using different proportions of mother liquors and retarders, it can meet the production and engineering application requirements of high-strength concrete with a single cementitious material.

[0058] The high-strength concrete admixture of the present invention is used in high-strength concrete with cement as the single cementitious material. Polyethylene glycol monoisoprene ether (TPEG-2400), mercaptopropionic acid, maleic anhydride, and hydroxyethyl acrylate are used as synthetic monomers to synthesize three admixture mother liquors respectively. Based on the functional differences of the three admixture mother liquors, a retarding component is introduced to form a compound.

[0059] To further illustrate the effects of the high-strength concrete admixture of the present invention, the following examples are provided.

[0060] First Embodiment

[0061] Steps S1 to S4: Prepare the first mother liquor based on polyethylene glycol monoisoprene ether and acrylic acid copolymer.

[0062] Prepare the first and second solutions separately:

[0063] First solution: 1.5g mercaptopropionic acid and 1.5g vitamin C dissolved in 180g water.

[0064] Second solution: 75g of acrylic acid dissolved in 180g of water.

[0065] Add 700g of deionized water and 710g of polyethylene glycol monoisoprene ether-2400 to a 3L glass reactor equipped with a mechanical stirrer, temperature control device, and automatic dropping system. Maintain the temperature at 60±5℃ by turning on the temperature control and stirring device. After the reactants are completely dissolved, add 5g of hydrogen peroxide (27.5%). Stir until homogeneous, and then begin dropping the first and second solutions simultaneously over 5 minutes. The first solution is added at a uniform rate over 3 hours, and the second solution over 2.5 hours. After the dropping is complete, maintain the temperature for 1.5 hours to stop the reaction; the synthesis of the first base solution is now complete.

[0066] Steps S5-S8: Prepare the second mother liquor based on polyethylene glycol monoisoprene ether and hydroxyethyl acrylate copolymer.

[0067] Prepare the third and fourth solutions separately:

[0068] Solution 3: 1.5g mercaptopropionic acid and 1.5g vitamin C are dissolved in 160g of water.

[0069] Solution 4: 35g of acrylic acid and 80g of hydroxyethyl acrylate are dissolved in 180g of water.

[0070] Add 700g of deionized water and 700g of polyethylene glycol monoisoprene ether-2400 to a 3L glass reactor equipped with a mechanical stirrer, temperature control device, and automatic dropping system. Maintain the temperature at 50±5℃ by turning on the temperature control and stirring device. After the reactants are completely dissolved, add 5g of hydrogen peroxide (27.5%). Stir until homogeneous, and then simultaneously begin dropping the third and fourth solutions over 5 minutes. The third solution is added at a uniform rate over 3 hours, and the fourth solution over 2.5 hours. After the dropping is complete, maintain the temperature for 1.5 hours to complete the reaction. The synthesis of the second base solution is then complete.

[0071] Steps S9 to S13: The third mother liquor based on the copolymer of polyethylene glycol monoisoprene ether and maleic anhydride.

[0072] Prepare solutions five, six, and seven respectively:

[0073] Fifth solution: 1.5g mercaptopropionic acid dissolved in 160g water.

[0074] Sixth solution: 3.5g of vitamin C dissolved in 180g of water.

[0075] The seventh solution: 65g of maleic anhydride dissolved in 150g of water.

[0076] Add 700g of deionized water and 750g of polyethylene glycol monoisoprene ether-2400 to a 3L glass reactor equipped with a mechanical stirrer, temperature control device, and automatic dropping system. Maintain the temperature at 45±5℃ by turning on the temperature control and stirring device. After the reactants are completely dissolved, add solution seven and stir until homogeneous. Then add 9.5g of hydrogen peroxide (27.5%) and stir until homogeneous. After 5 minutes, simultaneously begin dropping solutions five and six. Solution five is added at a uniform rate over 4 hours, and solution six is ​​added at a uniform rate over 4 hours. After the dropping is complete, maintain the temperature for 1 hour. The reaction is then complete, and the synthesis of the third base solution is finished.

[0077] In this embodiment, the retarder is sodium gluconate from Shandong Xiwang Sugar Industry Co., Ltd.

[0078] In this embodiment, the preparation steps S14 to S15 of the high-strength concrete admixture include the following raw materials in parts by weight:

[0079] Add 332 parts of water to a container equipped with a mechanical stirrer, add 28 parts of retarder to the container, turn on the stirring function, stir evenly, and confirm that there is no retarder sediment in the water to form a retarded liquid.

[0080] Add 100 parts of the first base liquid, 140 parts of the second base liquid, and 400 parts of the third base liquid to the retarder in sequence, stir for 0.5 hours, and the compounding is complete.

[0081] Second Embodiment

[0082] Steps S1 to S4: Prepare the first mother liquor based on polyethylene glycol monoisoprene ether and acrylic acid copolymer.

[0083] Prepare the first and second solutions separately:

[0084] First solution: 1.5g mercaptopropionic acid and 1.5g vitamin C dissolved in 180g water.

[0085] Second solution: 75g of acrylic acid dissolved in 180g of water.

[0086] Add 700g of deionized water and 710g of polyethylene glycol monoisoprene ether-2400 to a 3L glass reactor equipped with a mechanical stirrer, temperature control device, and automatic dropping system. Maintain the temperature at 60±5℃ by turning on the temperature control and stirring device. After the reactants are completely dissolved, add 5g of hydrogen peroxide (27.5%). Stir until homogeneous, and then begin dropping the first and second solutions simultaneously over 5 minutes. The first solution is added at a uniform rate over 3 hours, and the second solution over 2.5 hours. After the dropping is complete, maintain the temperature for 1.5 hours to stop the reaction; the synthesis of the first base solution is now complete.

[0087] Steps S5-S8: Prepare the second mother liquor based on polyethylene glycol monoisoprene ether and hydroxyethyl acrylate copolymer.

[0088] Prepare the third and fourth solutions separately:

[0089] Solution 3: 1.5g mercaptopropionic acid and 1.5g vitamin C are dissolved in 160g of water.

[0090] Solution 4: 35g of acrylic acid and 80g of hydroxyethyl acrylate are dissolved in 180g of water.

[0091] Add 700g of deionized water and 700g of polyethylene glycol monoisoprene ether-2400 to a 3L glass reactor equipped with a mechanical stirrer, temperature control device, and automatic dropping system. Maintain the temperature at 50±5℃ by turning on the temperature control and stirring device. After the reactants are completely dissolved, add 5g of hydrogen peroxide (27.5%). Stir until homogeneous, and then simultaneously begin dropping the third and fourth solutions over 5 minutes. The third solution is added at a uniform rate over 3 hours, and the fourth solution over 2.5 hours. After the dropping is complete, maintain the temperature for 1.5 hours to complete the reaction. The synthesis of the second base solution is then complete.

[0092] Steps S9 to S13: The third mother liquor based on the copolymer of polyethylene glycol monoisoprene ether and maleic anhydride.

[0093] Prepare solutions five, six, and seven respectively:

[0094] Fifth solution: 1.5g mercaptopropionic acid dissolved in 160g water.

[0095] Sixth solution: 3.5g of vitamin C dissolved in 180g of water.

[0096] The seventh solution: 65g of maleic anhydride dissolved in 150g of water.

[0097] Add 700g of deionized water and 750g of polyethylene glycol monoisoprene ether-2400 to a 3L glass reactor equipped with a mechanical stirrer, temperature control device, and automatic dropping system. Maintain the temperature at 45±5℃ by turning on the temperature control and stirring device. After the reactants are completely dissolved, add solution seven and stir until homogeneous. Then add 9.5g of hydrogen peroxide (27.5%) and stir until homogeneous. After 5 minutes, simultaneously begin dropping solutions five and six. Solution five is added at a uniform rate over 4 hours, and solution six is ​​added at a uniform rate over 4 hours. After the dropping is complete, maintain the temperature for 1 hour. The reaction is then complete, and the synthesis of the third base solution is finished.

[0098] In this embodiment, the retarder is sodium gluconate from Shandong Xiwang Sugar Industry Co., Ltd.

[0099] The compounding steps S14 and S15 of the high-strength concrete admixture in this embodiment include the following raw materials in parts by weight:

[0100] Add 332 parts of water to a container equipped with a stirring device, add 28 parts of retarder to the container, turn on the stirring function, stir evenly, and confirm that there is no retarder sediment in the water to form a retarded liquid.

[0101] Add 150 parts of the first base liquid, 150 parts of the second base liquid, and 340 parts of the third base liquid to the retarder in sequence, stir for 0.5 hours, and the compounding is complete.

[0102] Third Embodiment

[0103] Steps S1 to S4: Prepare the first mother liquor based on polyethylene glycol monoisoprene ether and acrylic acid copolymer.

[0104] Prepare the first and second solutions separately:

[0105] First solution: 1.5g mercaptopropionic acid and 1.5g vitamin C dissolved in 180g water.

[0106] Second solution: 75g of acrylic acid dissolved in 180g of water.

[0107] Add 700g of deionized water and 710g of polyethylene glycol monoisoprene ether-2400 to a 3L glass reactor equipped with a mechanical stirrer, temperature control device, and automatic dropping system. Maintain the temperature at 60±5℃ by turning on the temperature control and stirring device. After the reactants are completely dissolved, add 5g of hydrogen peroxide (27.5%). Stir until homogeneous, and then begin dropping the first and second solutions simultaneously over 5 minutes. The first solution is added at a uniform rate over 3 hours, and the second solution over 2.5 hours. After the dropping is complete, maintain the temperature for 1.5 hours to stop the reaction; the synthesis of the first base solution is now complete.

[0108] Steps S5-S8: Prepare the second mother liquor based on polyethylene glycol monoisoprene ether and hydroxyethyl acrylate copolymer.

[0109] Prepare the third and fourth solutions separately:

[0110] Solution 3: 1.5g mercaptopropionic acid and 1.5g vitamin C are dissolved in 160g of water.

[0111] Solution 4: 35g of acrylic acid and 80g of hydroxyethyl acrylate are dissolved in 180g of water.

[0112] Add 700g of deionized water and 700g of polyethylene glycol monoisoprene ether-2400 to a 3L glass reactor equipped with a mechanical stirrer, temperature control device, and automatic dropping system. Maintain the temperature at 50±5℃ by turning on the temperature control and stirring device. After the reactants are completely dissolved, add 5g of hydrogen peroxide (27.5%). Stir until homogeneous, and then simultaneously begin dropping the third and fourth solutions over 5 minutes. The third solution is added at a uniform rate over 3 hours, and the fourth solution over 2.5 hours. After the dropping is complete, maintain the temperature for 1.5 hours to complete the reaction. The synthesis of the second base solution is then complete.

[0113] Steps S9 to S13: The third mother liquor based on the copolymer of polyethylene glycol monoisoprene ether and maleic anhydride.

[0114] Prepare solutions five, six, and seven respectively:

[0115] Fifth solution: 1.5g mercaptopropionic acid dissolved in 160g water.

[0116] Sixth solution: 3.5g of vitamin C dissolved in 180g of water.

[0117] The seventh solution: 65g of maleic anhydride dissolved in 150g of water.

[0118] Add 700g of deionized water and 750g of polyethylene glycol monoisoprene ether-2400 to a 3L glass reactor equipped with a mechanical stirrer, temperature control device, and automatic dropping system. Maintain the temperature at 45±5℃ by turning on the temperature control and stirring device. After the reactants are completely dissolved, add solution seven and stir until homogeneous. Then add 9.5g of hydrogen peroxide (27.5%) and stir until homogeneous. After 5 minutes, simultaneously begin dropping solutions five and six. Solution five is added at a uniform rate over 4 hours, and solution six is ​​added at a uniform rate over 4 hours. After the dropping is complete, maintain the temperature for 1 hour. The reaction is then complete, and the synthesis of the third base solution is finished.

[0119] In this embodiment, the retarder is sodium gluconate from Shandong Xiwang Sugar Industry Co., Ltd.

[0120] The compounding steps S14 and S15 of the high-strength concrete admixture in this embodiment include the following raw materials in parts by weight:

[0121] Add 332 parts of water to a container equipped with a stirring device, add 28 parts of retarder to the container, turn on the stirring function, stir evenly, and confirm that there is no retarder sediment in the water to form a retarded liquid.

[0122] Add 200 parts of the first base liquid, 150 parts of the second base liquid, and 290 parts of the third base liquid to the retarder in sequence, stir for 0.5 hours, and the compounding is complete.

[0123] Comparative Example

[0124] Commonly used naphthalene-based concrete admixtures in the Ethiopian market were selected as the control group.

[0125] The high-strength concrete admixtures of the first to third embodiments and the naphthalene-based admixture in the comparative example were respectively incorporated into concrete. The spread, spread loss over time, and collapse time of the fresh concrete were measured, and the concrete strength at standard curing age was also measured. The concrete mix design is shown in Table 1, and the test results are shown in Table 2.

[0126] The spread and spread loss over time tests were determined according to GB / T 50080-2016 "Standard for Test Methods of Performance of Ordinary Concrete Mixtures"; the collapse time was determined according to Appendix A of JGJ / T 281-2012 "Technical Specification for Application of High-Strength Concrete" "Inverted Slump Test Method"; and the compressive strength of 100×100×100mm concrete specimens was tested according to GB / T50081-2019 "Standard for Test Methods of Physical and Mechanical Properties of Concrete".

[0127] Table 1. Mix proportions of the experimental concrete (kg / m³) 3 )

[0128]

[0129] Table 2 compares the expansion, expansion loss over time, collapse time, and compressive strength at age of the comparative sample and each embodiment.

[0130]

[0131] The incorporation of the high-strength concrete admixture of this invention weakens the surface force connection between cementitious particles, reduces the stress field of viscous substances, increases fluidity, improves aggregate encapsulation, results in good concrete uniformity, reduces slump time, and increases the strength of concrete at maturity. In contrast, local Ethiopian naphthalene-based water-reducing agents have low water-reducing rates. In comparative studies, it was found that a significant increase in admixture dosage was required to further improve slump, resulting in significant slump loss over time and higher concrete viscosity, which is inconvenient for pumping.

[0132] When water-reducing agents are added to concrete, different adsorption patterns occur at the solid-liquid interface. The high-strength concrete admixture of this invention belongs to the polycarboxylate superplasticizer system, compared to naphthalene-based water-reducing agents. The high-strength concrete admixture of this invention primarily adsorbs cement particles using a graft copolymer gear-type adsorption mechanism, such as... Figure One Naphthalene compounds are mainly adsorbed by rigid, horizontally positioned chains, such as... Figure Two In the cement paste form, the repulsive force between electrostatic fields in the high-strength concrete admixture of this invention is three-dimensional, resulting in a greater dispersion effect. The interaction force between the high-strength concrete admixture of this invention and the cement particle adsorption layer is a three-dimensional electrostatic repulsive force, with minimal potential change and good plasticity retention over time.

[0133] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A high-strength concrete admixture, characterized by, The high-strength concrete additive is used for high-strength concrete with cement as single cementing material, and is composed of a copolymer of polyethylene glycol monoisoprene ether and acrylic acid, hydroxyethyl acrylate and maleic anhydride, a retarder and water, wherein the retarder is sodium gluconate.

2. A method of producing a high-strength concrete admixture as claimed in claim 1, characterized by, The method comprises the following steps: 1.5 parts by mass of mercaptopropionic acid and 1.5 parts by mass of Vc are dissolved in 180 parts by mass of water to obtain a first solution; 75 parts by mass of acrylic acid are dissolved in 180 parts by mass of water to obtain a second solution; 710 parts by mass of polyethylene glycol monoisoprene ether are dissolved in 700 parts by mass of water, and then 5 parts by mass of hydrogen peroxide is added to obtain a first base solution; The first solution and the second solution are simultaneously and uniformly added to the first base solution, and the mixture is kept at a temperature for 1.5 hours to obtain a first mother liquor; 1.5 parts by mass of mercaptopropionic acid and 1.5 parts by mass of Vc are dissolved in 160 parts by mass of water to obtain a third solution; 35 parts by mass of acrylic acid and 80 parts by mass of hydroxyethyl acrylate are dissolved in 180 parts by mass of water to obtain a fourth solution; 700 parts by mass of polyethylene glycol monoisoprene ether are dissolved in 700 parts by mass of water, and then 5 parts by mass of hydrogen peroxide is added to obtain a second base solution; The third solution and the fourth solution are simultaneously and uniformly added to the second base solution, and the mixture is kept at a temperature for 1.5 hours to obtain a second mother liquor; 1.5 parts by mass of mercaptopropionic acid are dissolved in 160 parts by mass of water to obtain a fifth solution; 3.5 parts by mass of Vc are dissolved in 180 parts by mass of water to obtain a sixth solution; 65 parts by mass of maleic anhydride are dissolved in 150 parts by mass of water to obtain a seventh solution; 750 parts by mass of polyethylene glycol monoisoprene ether are dissolved in 700 parts by mass of water, and then the seventh solution is added and stirred uniformly, and then 9.5 parts by mass of hydrogen peroxide is added to obtain a third base solution; The fifth solution and the sixth solution are simultaneously and uniformly added to the third base solution, and the mixture is kept at a temperature for 1 hour to obtain a third mother liquor; 28 parts by mass of a retarder is added to 332 parts by mass of water to obtain a retarder solution; 100-200 parts by mass of the first mother liquor, 140-150 parts by mass of the second mother liquor and 290-400 parts by mass of the third mother liquor are sequentially added to the retarder solution and stirred uniformly to obtain the high-strength concrete additive.

3. The preparation method according to claim 2, characterized in that, The mass concentration of the hydrogen peroxide is 27.5%.

4. The preparation method according to claim 2, characterized in that, The keeping temperature of the first base solution is 60±5℃.

5. The preparation method according to claim 2, characterized in that, The keeping temperature of the second base solution is 50±5℃.

6. The preparation method according to claim 2, characterized in that, The keeping temperature of the third base solution is 45±5℃.

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