A modified mineral admixture concrete and preparation method thereof

Abstract

The present invention relates to a modified mineral admixture concrete and a preparation method thereof, and belongs to the technical field of building materials; the present invention uses fly ash admixture, silicate cement, sand, acrylic acid, sodium hypophosphite, sodium formaldehyde sulfoxylate, ammonium persulfate, and modified water reducer as raw materials to prepare a modified mineral admixture concrete; the present invention also discloses a preparation method of the modified mineral admixture concrete, including first preparing a water reducer mother liquor, then mixing the fly ash admixture with cement and sand to obtain a mixture, and finally adding the water reducer mother liquor to the mixture to obtain the modified mineral admixture concrete. The preparation method of the modified mineral admixture concrete of the present invention is simple, the raw materials are easy to obtain, the strength after curing is high, the compressive strength after curing for 28 days can reach up to 51.6MPa, the initial fluidity is good, the collapse retention is excellent, and it can be widely used in the construction field.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and in particular relates to a modified mineral admixture concrete and a preparation method thereof. Background Art

[0002] Concrete is an indispensable building material in modern buildings. With the continuous development of modern construction technology, the requirements for concrete materials are also increasing. In order to meet the needs of buildings in terms of mechanical properties, durability and construction quality, high-performance concrete has gradually become an important development direction in the construction field. Mineral admixture concrete is an important form of high-performance concrete. The active ingredients in the admixture react with calcium hydroxide in the cement hydration product to generate hydration products with gelling properties, thereby enhancing the durability of concrete. Therefore, it has broad application prospects.

[0003] However, this technology still has some shortcomings. Although an appropriate amount of mineral admixtures can improve the durability of concrete, when the amount added is too large, the strength of the concrete will decrease. In addition, the initial fluidity and slump resistance of concrete added with mineral admixtures will decrease, which greatly increases the difficulty of construction. The extension of construction time may cause problems such as segregation and water seepage in the concrete, affecting the construction quality and progress. How to improve the strength and slump resistance of concrete with mineral admixtures has become the primary problem to be solved by existing technologies. Summary of the invention

[0004] The object of the present invention is to provide a modified mineral admixture concrete and a preparation method thereof, so as to solve the problems mentioned in the above background technology.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A modified mineral admixture concrete comprises the following raw materials in parts by weight: 15-23 parts of fly ash admixture, 3-4 parts of Portland cement, 74-85 parts of sand, 0.08-0.1 parts of acrylic acid, 0.001-0.002 parts of sodium hypophosphite, 0.001-0.0015 parts of sodium formaldehyde sulfoxylate, 0.002-0.006 parts of ammonium persulfate, and 0.05-0.08 parts of modified water reducing agent;

[0007] A method for preparing modified mineral admixture concrete comprises the following steps:

[0008] Step 1: Weigh the raw materials by mass: 15-23 parts of fly ash admixture, 3-4 parts of Portland cement, 74-85 parts of sand, 0.08-0.1 parts of acrylic acid, 0.001-0.002 parts of sodium hypophosphite, 0.001-0.0015 parts of sodium formaldehyde sulfoxylate, 0.002-0.006 parts of ammonium persulfate, and 0.05-0.08 parts of modified water reducer, dissolve the modified water reducer, sodium hypophosphite, and ammonium persulfate in water, and stir evenly to obtain liquid A;

[0009] Step 2: Dissolve acrylic acid and sodium formaldehyde sulfoxylate in water and stir evenly to obtain liquid B;

[0010] Step 3: Mix liquid A and liquid B by stirring to obtain a water reducing agent mother solution;

[0011] Step 4: Grind the fly ash admixture, mix it evenly with silicate cement, sand and water, and stir it to obtain a mixture;

[0012] Step 5: adding the water reducing agent mother solution obtained in the step 3 to the mixture obtained in the step 4, and stirring evenly to obtain a modified mineral admixture concrete;

[0013] Furthermore, in the third step, the temperature condition for stirring and mixing liquid A and liquid B is 10-40°C.

[0014] Furthermore, in the fourth step, the particle size specification of the fly ash admixture after grinding is 0.1-0.5 mm.

[0015] Furthermore, the modified water reducing agent is prepared by the following steps:

[0016] Step 1: 4-hydroxy-1,8-naphthalene dicarboxylic anhydride, acryloyl chloride, triethylamine and tetrahydrofuran were mixed in a three-necked flask, magnetic stirring was started, and the mixture was reacted in an ice-water bath for 5 h. After the reaction was completed, the mixture was washed with a saturated sodium carbonate solution, and the organic layer was separated by a separatory funnel, and then rotary evaporated to obtain intermediate 1;

[0017] Step 2: Mix the intermediate 1, the platinum complex and tetrahydrofuran in a three-necked flask, install a condenser and a thermometer, turn on the magnetic stirring, and add trimethoxysilane to the three-necked flask at 110°C using a high-pressure dropping pump. After the addition is completed, continue the reaction at 140°C for 2-3 hours. After the reaction is completed, rotary evaporate to obtain the intermediate 2;

[0018] Step 3: Mix 2-aminotoluene-4-sulfonic acid, N-bromosuccinimide, benzoyl peroxide and chloroform in a three-necked flask, install a condenser and a thermometer, start magnetic stirring, and react at 80°C for 12 hours. After the reaction is completed, rotary evaporation is performed to obtain intermediate 3;

[0019] Step 4: Mix intermediate 2, intermediate 3, tetrabutylammonium bromide and tetrahydrofuran in a three-necked flask, install a condenser and a thermometer, start magnetic stirring, and react at a temperature of 110-120°C for 10-12h. After the reaction is completed, add ether to the three-necked flask, vacuum filter, and recrystallize the obtained solid to obtain intermediate 4;

[0020] Step 5: Mix the intermediate 4, isopentenyl polyethylene glycol ether, sodium hydroxide and dimethyl sulfoxide in a three-necked flask, install a condenser and a thermometer, start magnetic stirring, and react at 120° C. for 10 hours under nitrogen protection. After the reaction is completed, add hydrochloric acid to the three-necked flask to adjust the pH to below 2, separate the organic layer with a separatory funnel, and rotary evaporate to obtain the modified water reducer;

[0021] Furthermore, the amount ratio of 4-hydroxy-1,8-naphthalene dicarboxylic anhydride, acryloyl chloride, triethylamine and tetrahydrofuran used in step 1 is 0.1 mol: 0.1-0.12 mol: 0.08-0.1 mol: 80-100 mL.

[0022] Furthermore, the amount ratio of the intermediate 1, the platinum complex, tetrahydrofuran and trimethoxysilane used in step 2 is 0.08 mol: 1 mL: 60-80 mL: 0.08-0.1 mol.

[0023] Furthermore, the amount ratio of 2-aminotoluene-4-sulfonic acid, N-bromosuccinimide, benzoyl peroxide and chloroform used in step 3 is 0.1 mol: 0.1 mol: 3-4 g: 60-80 mL.

[0024] Furthermore, the amount ratio of intermediate 2, intermediate 3, tetrabutylammonium bromide and tetrahydrofuran used in step 4 is 0.05 mol: 0.05 mol: 5-8 g: 100-120 mL.

[0025] Furthermore, the amount ratio of the intermediate 4, isopentenyl polyethylene glycol ether, sodium hydroxide and dimethyl sulfoxide used in step 5 is 3g:27g:6-9g:150-200mL.

[0026] Beneficial effects of the present invention:

[0027] (1) The present invention uses fly ash admixture, silicate cement, sand, acrylic acid, sodium hypophosphite, sodium formaldehyde sulfoxylate, ammonium persulfate, and modified water reducer as raw materials to prepare a modified mineral admixture concrete. The present invention first mixes the modified water reducer, sodium hypophosphite, and ammonium persulfate to prepare liquid A, then mixes acrylic acid and sodium formaldehyde sulfoxylate to prepare liquid B, and then mixes liquid A and liquid B to prepare a water reducer mother liquor, and then the water reducer mother liquor is added to the mixture obtained by stirring and mixing the fly ash admixture, silicate cement, and sand after grinding, to prepare a modified mineral admixture concrete. The preparation method of the present invention is simple, green and environmentally friendly, and the prepared concrete has good slump retention and high curing strength, which is conducive to promotion.

[0028] (2) The present invention uses 4-hydroxy-1,8-naphthalene dicarboxylic anhydride as a raw material, and reacts with acryloyl chloride to undergo an esterification reaction in the presence of triethylamine as an acid-binding agent to obtain an intermediate 1 with a double bond. The double bond of the intermediate 1 is then reacted with trimethoxysilane under the catalytic action of a platinum complex to obtain an intermediate 2 having an organosilicon structure at the end group. 2-aminotoluene-4-sulfonic acid is used as a raw material, N-bromosuccinimide is used as a halogenating agent, and benzoyl peroxide is used as an initiator to undergo a halogenation reaction to obtain an intermediate 3. Intermediate 3 and intermediate 2 are then subjected to an amidation reaction under the catalytic action of tetrabutylammonium bromide to obtain an intermediate 4. Finally, the bromine atom of intermediate 4 is subjected to a nucleophilic substitution reaction with the hydroxyl group of isopentenyl polyethylene glycol ether to obtain a modified water reducer. The modified water reducer of the present invention has a large steric hindrance and a rigid structure. When used, it can effectively prevent the adsorption of cement paste and improve the initial fluidity of concrete paste. The water reducer of the present invention also contains sulfonic acid groups on the benzene ring side chains, which can be hydrolyzed to form anchoring groups, which are adsorbed on the surface of cement particles to generate electrostatic repulsion, destroy the flocculation structure of cement paste, and improve the dispersibility of cement paste in concrete. In addition, the water reducer of the present invention has the structure of naphthalene-based water reducer and carboxylate-based water reducer, which can work together to achieve a more efficient water reduction effect, achieve higher fluidity and pumpability, and can reduce the pores and defects inside the concrete, enhance the stability and working performance of the concrete. In addition, the water reducer of the present invention also has an organic silicon structure, which can improve the toughness of the cement paste while improving the fluidity of the cement paste, so that the cured concrete not only has higher strength, but also has a certain sulfate resistance.

[0029] (3) The modified mineral admixture concrete of the present invention has a simple preparation method, readily available raw materials, and is green and environmentally friendly. The prepared concrete has good slump resistance, high curing strength, and a certain sulfate resistance, and can be widely used in the construction field. DETAILED DESCRIPTION

[0030] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0031] A modified water reducing agent is prepared by the following steps:

[0032] Step 1: 0.1 mol 4-hydroxy-1,8-naphthalene dicarboxylic anhydride, 0.1 mol acryloyl chloride, 0.08 mol triethylamine and 80 mL tetrahydrofuran were mixed in a container, stirred evenly, and reacted in an ice-water bath for 5 h. After the reaction, the mixture was washed with a saturated sodium carbonate solution, and the organic layer was separated and rotary evaporated to obtain intermediate 1;

[0033] Step 2: 0.08 mol of intermediate 1, 1 mL of platinum complex and 60 mL of tetrahydrofuran were mixed in a container, and after stirring evenly, 0.08 mol of trimethoxysilane was added dropwise to the container at a temperature of 110°C. After the addition was completed, the reaction was continued at a temperature of 140°C for 2 hours. After the reaction was completed, the intermediate 2 was obtained by rotary evaporation;

[0034] Step 3: 0.1 mol 2-aminotoluene-4-sulfonic acid, 0.1 mol N-bromosuccinimide, 3 g benzoyl peroxide and 60 mL chloroform were mixed in a container, stirred evenly, and reacted at 80°C for 12 h. After the reaction was completed, the intermediate 3 was obtained by rotary evaporation;

[0035] Step 4: 0.05 mol of intermediate 2, 0.05 mol of intermediate 3, 5 g of tetrabutylammonium bromide and 100 mL of tetrahydrofuran were mixed in a container, stirred evenly, and reacted at 110° C. for 10 h. After the reaction was completed, ether was added to the container, vacuum filtered, and the obtained solid was recrystallized to obtain intermediate 4;

[0036] Step 5: Mix 3 g of intermediate 4, 27 g of isopentenyl polyethylene glycol ether, 6 g of sodium hydroxide, and 150 mL of dimethyl sulfoxide in a container, stir evenly, and react at 120° C. for 10 h under nitrogen protection. After the reaction, add hydrochloric acid to the container to adjust the pH to below 2. After separating the organic layer, rotary evaporate to obtain the modified water reducer. Example 2

[0037] A modified water reducing agent is prepared by the following steps:

[0038] Step 1: 0.1 mol 4-hydroxy-1,8-naphthalene dicarboxylic anhydride, 0.11 mol acryloyl chloride, 0.09 mol triethylamine and 90 mL tetrahydrofuran were mixed in a container, stirred evenly, and reacted in an ice-water bath for 5 h. After the reaction, the mixture was washed with a saturated sodium carbonate solution, and the organic layer was separated and rotary evaporated to obtain intermediate 1;

[0039] Step 2: 0.08 mol of intermediate 1, 1 mL of platinum complex, and 70 mL of tetrahydrofuran were mixed in a container, and after stirring evenly, 0.09 mol of trimethoxysilane was added dropwise to the container at a temperature of 110°C. After the addition was completed, the reaction was continued at a temperature of 140°C for 2.5 hours. After the reaction was completed, the intermediate 2 was obtained by rotary evaporation;

[0040] Step 3: 0.1 mol 2-aminotoluene-4-sulfonic acid, 0.1 mol N-bromosuccinimide, 3.5 g benzoyl peroxide and 70 mL chloroform were mixed in a container, stirred evenly, and reacted at 80°C for 12 h. After the reaction was completed, the intermediate 3 was obtained by rotary evaporation;

[0041] Step 4: 0.05 mol of intermediate 2, 0.05 mol of intermediate 3, 7 g of tetrabutylammonium bromide and 110 mL of tetrahydrofuran were mixed in a container, stirred evenly, and reacted at 115°C for 11 h. After the reaction, ether was added to the container, vacuum filtered, and the obtained solid was recrystallized to obtain intermediate 4;

[0042] Step 5: Mix 3 g of intermediate 4, 27 g of isopentenyl polyethylene glycol ether, 7 g of sodium hydroxide, and 175 mL of dimethyl sulfoxide in a container, stir evenly, and react at 120° C. for 10 h under nitrogen protection. After the reaction, add hydrochloric acid to the container to adjust the pH to below 2. After separating the organic layer, rotary evaporate to obtain the modified water reducer. Example 3

[0043] A modified water reducing agent is prepared by the following steps:

[0044] Step 1: 0.1 mol 4-hydroxy-1,8-naphthalene dicarboxylic anhydride, 0.12 mol acryloyl chloride, 0.1 mol triethylamine and 100 mL tetrahydrofuran were mixed in a container, stirred evenly, and reacted in an ice-water bath for 5 h. After the reaction, the mixture was washed with a saturated sodium carbonate solution, and the organic layer was separated and rotary evaporated to obtain intermediate 1;

[0045] Step 2: 0.08 mol of intermediate 1, 1 mL of platinum complex, and 80 mL of tetrahydrofuran were mixed in a container, and after stirring evenly, 0.1 mol of trimethoxysilane was added dropwise to the container at a temperature of 110°C. After the addition was completed, the reaction was continued at a temperature of 140°C for 3 hours. After the reaction was completed, the intermediate 2 was obtained by rotary evaporation;

[0046] Step 3: 0.1 mol 2-aminotoluene-4-sulfonic acid, 0.1 mol N-bromosuccinimide, 4 g benzoyl peroxide and 80 mL chloroform were mixed in a container, stirred evenly, and reacted at 80°C for 12 h. After the reaction was completed, the intermediate 3 was obtained by rotary evaporation;

[0047] Step 4: 0.05 mol of intermediate 2, 0.05 mol of intermediate 3, 8 g of tetrabutylammonium bromide and 120 mL of tetrahydrofuran were mixed in a container, stirred evenly, and reacted at 120° C. for 12 h. After the reaction was completed, ether was added to the container, vacuum filtered, and the obtained solid was recrystallized to obtain intermediate 4;

[0048] Step 5: Mix 3 g of intermediate 4, 27 g of isopentenyl polyethylene glycol ether, 9 g of sodium hydroxide, and 200 mL of dimethyl sulfoxide in a container, stir evenly, and react at 120 ° C for 10 h under nitrogen protection. After the reaction, add hydrochloric acid to the container to adjust the pH to below 2. After separating the organic layer, rotary evaporate to obtain the modified water reducer. Example 4

[0049] A modified mineral admixture concrete comprises the following raw materials in parts by weight: 15 parts of fly ash admixture, 3 parts of Portland cement, 74 parts of sand, 0.08 parts of acrylic acid, 0.001 parts of sodium hypophosphite, 0.001 parts of sodium formaldehyde sulfoxylate, 0.002 parts of ammonium persulfate, and 0.05 parts of the modified water reducing agent obtained in Example 1;

[0050] A method for preparing modified mineral admixture concrete comprises the following steps:

[0051] Step 1: Weigh the raw materials by mass: 15 parts of fly ash admixture, 3 parts of Portland cement, 74 parts of sand, 0.08 parts of acrylic acid, 0.001 parts of sodium hypophosphite, 0.001 parts of sodium formaldehyde sulfoxylate, 0.002 parts of ammonium persulfate, and 0.05 parts of the modified water reducer obtained in Example 1, and dissolve the modified water reducer, sodium hypophosphite, and ammonium persulfate in water, and stir evenly to obtain liquid A;

[0052] Step 2: Dissolve acrylic acid and sodium formaldehyde sulfoxylate in water and stir evenly to obtain liquid B;

[0053] Step 3: Mix liquid A and liquid B at a temperature of 10°C to obtain a water reducing agent mother solution;

[0054] Step 4: Grind the fly ash admixture into particles with a particle size of 0.1-0.5 mm, and then evenly mix with silicate cement, sand and water and stir to obtain a mixture;

[0055] Step 5: Add the water reducing agent mother solution obtained in the third step to the mixture obtained in the fourth step, and stir evenly to obtain a modified mineral admixture concrete. Example 5

[0056] A modified mineral admixture concrete comprises the following raw materials in parts by weight: 15 parts of fly ash admixture, 3 parts of Portland cement, 74 parts of sand, 0.1 parts of acrylic acid, 0.002 parts of sodium hypophosphite, 0.0015 parts of sodium formaldehyde sulfoxylate, 0.006 parts of ammonium persulfate, and 0.08 parts of the modified water reducing agent obtained in Example 2;

[0057] A method for preparing modified mineral admixture concrete comprises the following steps:

[0058] Step 1: Weigh the raw materials by mass: 15 parts of fly ash admixture, 3 parts of Portland cement, 74 parts of sand, 0.1 parts of acrylic acid, 0.002 parts of sodium hypophosphite, 0.0015 parts of sodium formaldehyde sulfoxylate, 0.006 parts of ammonium persulfate, and 0.08 parts of the modified water reducer obtained in Example 2, and dissolve the modified water reducer, sodium hypophosphite, and ammonium persulfate in water, and stir evenly to obtain liquid A;

[0059] Step 2: Dissolve acrylic acid and sodium formaldehyde sulfoxylate in water and stir evenly to obtain liquid B;

[0060] Step 3: Mix liquid A and liquid B at 25°C to obtain a water reducing agent mother solution;

[0061] Step 4: Grind the fly ash admixture into particles with a particle size of 0.1-0.5 mm, and then evenly mix with silicate cement, sand and water and stir to obtain a mixture;

[0062] Step 5: Add the water reducing agent mother solution obtained in the third step to the mixture obtained in the fourth step, and stir evenly to obtain a modified mineral admixture concrete. Example 6

[0063] A modified mineral admixture concrete comprises the following raw materials in parts by weight: 23 parts of fly ash admixture, 4 parts of Portland cement, 85 parts of sand, 0.08 parts of acrylic acid, 0.001 parts of sodium hypophosphite, 0.001 parts of sodium formaldehyde sulfoxylate, 0.002 parts of ammonium persulfate, and 0.05 parts of the modified water reducing agent obtained in Example 3;

[0064] A method for preparing modified mineral admixture concrete comprises the following steps:

[0065] Step 1: Weigh the raw materials by mass: 23 parts of fly ash admixture, 4 parts of Portland cement, 85 parts of sand, 0.08 parts of acrylic acid, 0.001 parts of sodium hypophosphite, 0.001 parts of sodium formaldehyde sulfoxylate, 0.002 parts of ammonium persulfate, and 0.05 parts of the modified water-reducing agent obtained in Example 3, and dissolve the modified water-reducing agent, sodium hypophosphite, and ammonium persulfate in water, and stir evenly to obtain liquid A;

[0066] Step 2: Dissolve acrylic acid and sodium formaldehyde sulfoxylate in water and stir evenly to obtain liquid B;

[0067] Step 3: Mix liquid A and liquid B at 40°C to obtain a water reducing agent mother solution;

[0068] Step 4: Grind the fly ash admixture into particles with a particle size of 0.1-0.5 mm, and then evenly mix with silicate cement, sand and water and stir to obtain a mixture;

[0069] Step 5: Add the water reducing agent mother solution obtained in the third step to the mixture obtained in the fourth step, and stir evenly to obtain a modified mineral admixture concrete.

[0070] Comparative Example 1

[0071] The "modified water-reducing agent obtained in Example 3" used in Example 6 was replaced with the same mass fraction of isopentenyl polyethylene glycol ether, and the other conditions remained unchanged.

[0072] Comparative Example 2

[0073] This comparative example is fly ash lightweight aggregate concrete sold by Zhengzhou Ririshun Building Materials Co., Ltd.

[0074] The slump performance and loss comparison test of concrete was carried out with reference to the national standard GB8076-2008 "Concrete Admixtures". The slump and compressive strength of the concrete of Examples 4-6 and Comparative Examples 1-2 were tested respectively. The test results are shown in Table 1:

[0075] Table 1

[0076]

[0077] It can be seen from Table 1 that the mineral admixture concrete of the present invention is superior to the commercially available fly ash lightweight aggregate concrete in terms of initial fluidity, slump retention, and compressive strength, while the mineral admixture concrete in Comparative Example 1 is inferior to the mineral admixtures of Examples 4-6 in performance because the modified water reducer of the present invention is not used. In summary, the preparation method of the mineral admixture modified concrete of the present invention is simple, the raw materials are easily available, the initial fluidity and slump retention are good, the compressive strength is excellent, and it can be widely used in the construction field.

[0078] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A modified mineral admixture concrete, characterized in that: Contains the following raw materials: fly ash admixture, silicate cement, sand, acrylic acid, sodium hypophosphite, sodium formaldehyde sulfoxylate, ammonium persulfate, modified water reducing agent; Wherein, the modified water reducing agent is prepared by the following steps: Step 1: 4-hydroxy-1,8-naphthalene dicarboxylic anhydride, acryloyl chloride, triethylamine and tetrahydrofuran were mixed in a container, stirred evenly and reacted in an ice-water bath for 5 h to obtain intermediate 1; Step 2: Mix the intermediate 1, the platinum complex and tetrahydrofuran in a container, stir evenly, and then drop trimethoxysilane into the container at 110° C. After the dropwise addition is completed, continue the reaction at 140° C. for 2-3 hours to obtain the intermediate 2; Step 3: Mix 2-aminotoluene-4-sulfonic acid, N-bromosuccinimide, benzoyl peroxide and chloroform in a container, stir evenly, and react at 80° C. for 12 h to obtain intermediate 3; Step 4: Mix intermediate 2, intermediate 3, tetrabutylammonium bromide and tetrahydrofuran in a container, stir evenly, and react at 110-120° C. for 10-12 h to obtain intermediate 4; Step 5: Mix the intermediate 4, isopentenyl polyethylene glycol ether, sodium hydroxide and dimethyl sulfoxide in a container, stir evenly, raise the system temperature to 120° C. under nitrogen protection and react for 10 hours to obtain the modified water reducer.

2. The modified mineral admixture concrete according to claim 1, characterized in that: The amount ratio of 4-hydroxy-1,8-naphthalene dicarboxylic anhydride, acryloyl chloride, triethylamine and tetrahydrofuran used in step 1 is 0.1 mol: 0.1-0.12 mol: 0.08-0.1 mol: 80-100 mL.

3. The modified mineral admixture concrete according to claim 1, characterized in that: The amount ratio of the intermediate 1, the platinum complex, tetrahydrofuran and trimethoxysilane used in step 2 is 0.08 mol: 1 mL: 60-80 mL: 0.08-0.1 mol.

4. The modified mineral admixture concrete according to claim 1, characterized in that: The amount ratio of 2-aminotoluene-4-sulfonic acid, N-bromosuccinimide, benzoyl peroxide and chloroform used in step 3 is 0.1 mol: 0.1 mol: 3-4 g: 60-80 mL.

5. The modified mineral admixture concrete according to claim 1, characterized in that: The amount ratio of intermediate 2, intermediate 3, tetrabutylammonium bromide and tetrahydrofuran used in step 4 is 0.05 mol: 0.05 mol: 5-8 g: 100-120 mL.

6. The modified mineral admixture concrete according to claim 1, characterized in that: The amount ratio of the intermediate 4, isopentenyl polyethylene glycol ether, sodium hydroxide and dimethyl sulfoxide used in step 5 is 3g:27g:6-9g:150-200mL.

7. A method for preparing modified mineral admixture concrete, characterized in that: The method is used to prepare the modified mineral admixture concrete according to any one of claims 1 to 6, and the preparation method comprises the following steps: Step 1: Weigh the raw materials by mass: 15-23 parts of fly ash admixture, 3-4 parts of Portland cement, 74-85 parts of sand, 0.08-0.1 parts of acrylic acid, 0.001-0.002 parts of sodium hypophosphite, 0.001-0.0015 parts of sodium formaldehyde sulfoxylate, 0.002-0.006 parts of ammonium persulfate, and 0.05-0.08 parts of modified water reducer, dissolve the modified water reducer, sodium hypophosphite, and ammonium persulfate in water, and stir evenly to obtain liquid A; Step 2: Dissolve acrylic acid and sodium formaldehyde sulfoxylate in water and stir evenly to obtain liquid B; Step 3: Mix liquid A and liquid B by stirring to obtain a water reducing agent mother solution; Step 4: Grind the fly ash admixture, mix it evenly with silicate cement, sand and water, and stir it to obtain a mixture; Step 5: Add the water reducing agent mother solution obtained in the third step to the mixture obtained in the fourth step, and stir evenly to obtain a modified mineral admixture concrete.

8. The method for preparing modified mineral admixture concrete according to claim 7, characterized in that: In the third step, the temperature condition for stirring and mixing liquid A and liquid B is 10-40°C.

9. The method for preparing modified mineral admixture concrete according to claim 7, characterized in that: In the fourth step, the particle size specification of the fly ash admixture after grinding is 0.1-0.5mm.

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