A machine-made sand concrete mixture and workability regulator and preparation method thereof

Abstract

The invention relates to the technical field of concrete admixtures and discloses a machine-made sand concrete mixture and a workability regulator, comprising diphenolic acid, an alcohol amine, 2-methyl-2-propylene-1-ol, trifluoromethanesulfonic acid, an unsaturated carboxylic acid ester, 2-acrylamido-2-methylpropanesulfonic acid, ammonium bisulfite, ammonium persulfate and deionized water. The machine-made sand concrete mixture and the workability regulator provided by the invention have good water solubility and good compatibility with a polycarboxylate water-reducing agent. After being added to machine-made sand concrete, the concrete mixture has good cohesion and water retention, and has a good slurrying effect on machine-made sand and gravel. The workability of the concrete mixture is significantly improved, bleeding is reduced, and the slump loss of concrete over time is reduced. The machine-made sand concrete regulator has good adaptability to slump retention over time for different machine-made sand materials of concrete, in particular, machine-made sand containing mud and powder. In addition, the machine-made sand concrete regulator provided by the invention is green and environmentally friendly, has a low production cost, and is easy to promote and apply.

Description

Technical Field

[0001] The invention relates to the technical field of concrete admixtures, in particular to a machine-made sand concrete mixture and a workability regulator and a preparation method thereof. Background Art

[0002] Sand and gravel are the most basic and indispensable building materials in engineering construction, especially cement concrete. For a long time, my country has mainly used natural river sand for sand use. However, after more than 20 years of large-scale mining, natural sand resources have gradually decreased. With the strengthening of environmental protection policy supervision, natural river sand cannot meet the needs of the construction market. More and more regions have begun to use machine-made sand. Machine-made sand is an ideal substitute for natural river sand. Machine-made sand produced by advanced technology and equipment can completely replace natural river sand for concrete production. However, due to the rapid application of machine-made sand, some areas lack understanding and supervision of machine-made sand. Cost, equipment and process factors have led to uneven quality of machine-made sand, and the quality varies greatly. It is mainly manifested in the lack of particle shaping process and poor particle shape; the powder selection process is relatively rough, and the stone powder content fluctuates greatly (5% to 15%); the source of the parent rock is unstable, it has not been cleaned and impurities removed, and the mud content is high; the equipment process is not standardized, and the grading is poor;

[0003] The quality issues of manufactured sand lead to the frequent occurrence of workability problems in concrete mixed with manufactured sand, such as poor encapsulation, poor fluidity, large slump loss, and easy segregation and bleeding of the concrete mixture. At the same time, there are also problems such as sensitivity to water consumption, large slump fluctuations, and difficult to control fluidity. These problems have affected the promotion and application of manufactured sand in concrete, causing serious engineering quality risks and even engineering quality accidents.

[0004] To solve the workability problem of machine-made sand concrete, the adjustment method of compounding water-reducing agent mother liquor and other auxiliary materials is usually adopted. For example, it is necessary to use a functional water-reducing agent mother liquor with high water-reducing properties, add a water-retaining thickener such as hydroxypropyl methylcellulose (HPMC) and an air-entraining agent. However, the finished product of this type of water-reducing agent often has the problem that HPMC is expensive, difficult to dissolve in water, and easily agglomerates. This results in poor homogeneity of the finished product compounded with polycarboxylic acid admixture, which in turn affects the performance of the polycarboxylic acid admixture product.

[0005] At present, most of the machine-made sand concrete and workability regulators on the market are mainly composed of triethanolamine, triisopropanolamine and some inorganic salts, a small amount of air entraining agent and water. The dosage in concrete is 2kg / m 3 After adding machine-made sand conditioner, the expansion of fresh concrete will be significantly reduced, and the slump expansion of concrete mixture will lose significantly over time. The promotion and application of this product has certain limitations.

[0006] The workability of manufactured sand concrete involves multiple aspects, including concrete water retention, cohesion, encapsulation, bubble structure, and stability. Simply relying on the compounding of water reducers and adjusting the mix ratio is insufficient to fully address this issue. Therefore, a modifier specifically designed to adjust the workability of manufactured sand concrete is needed. Therefore, those skilled in the art have provided a workability modifier for manufactured sand concrete mixtures and a method for preparing the same to address the issues raised in the background art. Summary of the Invention

[0007] The object of the present invention is to provide a machine-made sand concrete mixture and a workability regulator and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A machine-made sand concrete mixture and a workability regulator include diphenolic acid, olamine, 2-methyl-2-propene-1-ol, trifluoromethanesulfonic acid, unsaturated carboxylic acid ester, 2-acrylamido-2-methylpropanesulfonic acid, ammonium bisulfite, ammonium persulfate and deionized water, wherein the diphenolic acid, olamine, 2-methyl-2-propene-1-ol, trifluoromethanesulfonic acid, unsaturated carboxylic acid ester, 2-acrylamido-2-methylpropanesulfonic acid, ammonium bisulfite, ammonium persulfate and deionized water are used. The weight parts of ammonium sulfate and deionized water are as follows: 286-372 parts of diphenolic acid, 88-177 parts of olamine, 72-144 parts of 2-methyl-2-propylene-1-ol, 10-30 parts of trifluoromethanesulfonic acid, 320-640 parts of unsaturated carboxylic acid ester, 100-150 parts of 2-acrylamido-2-methylpropanesulfonic acid, 5-10 parts of ammonium bisulfite, 5-10 parts of ammonium persulfate and 1000-2000 parts of deionized water.

[0010] As a further embodiment of the present invention, the alcohol amine is one of triethanolamine, monoethanoldiisopropanolamine and diethanolmonoisopropanolamine.

[0011] As a further embodiment of the present invention, the unsaturated carboxylic acid ester is one of diethylene glycol monoacrylate and ethylene glycol diacrylate.

[0012] A method for preparing a machine-made sand concrete mixture and a workability regulator comprises the following steps:

[0013] S1, add 286-372 parts of diphenolic acid, 88-177 parts of monoethanoldiisopropanolamine, 72-144 parts of 2-methyl-2-propylene-1-ol and 10-30 parts of trifluoromethanesulfonic acid into a reactor, mix them evenly, react at a certain temperature after mixing evenly, react for a period of time, cool to room temperature after a period of time and add 200-300 parts of deionized water to obtain liquid A;

[0014] S2. Take 320-640 parts of unsaturated carboxylic acid ester, 100-150 parts of 2-acrylamido-2-methylpropanesulfonic acid and 5-10 parts of ammonium bisulfite, and dissolve them in 400-600 parts of deionized water to obtain liquid B;

[0015] S3. Dissolve 5 to 10 parts of ammonium persulfate in 50 parts of deionized water to obtain liquid C;

[0016] S4. Put the remaining deionized water into the reactor, heat it to a certain temperature, and then start stirring. Then, add liquid A, liquid B, and liquid C dropwise respectively, continue to add for a certain period of time and complete the addition, keep warm for a period of time, and then cool to room temperature to obtain a machine-made sand concrete mixture and workability regulator.

[0017] As a further solution of the present invention: the reaction temperature after uniform mixing in S1 is 120-180° C., and the reaction time is 3-6 hours.

[0018] As a further solution of the present invention: the certain temperature in S4 is 60-90°C.

[0019] As a further solution of the present invention: the continuous dripping time in S4 is 2 to 3 hours.

[0020] As a further solution of the present invention: the holding time in S4 is 0.5 to 1 hour.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The workability regulator for the machine-made sand concrete mixture provided by the present invention has the same functional group as the currently widely used polycarboxylate water-reducing agent, has good water solubility, is not easy to agglomerate, and has good compatibility with the polycarboxylate water-reducing agent; after being added to the machine-made sand concrete, the concrete mixture has good cohesion and water retention, the machine-made sand and gravel have a good grouting effect, the workability of the concrete mixture is significantly improved, water bleeding is reduced, and the loss of concrete slump over time is reduced.

[0023] 2. The machine-made sand concrete mixture and workability regulator provided by the present invention have good adaptability to time-dependent collapse for different machine-made sand materials for concrete, especially machine-made sand containing mud and powder. In addition, the machine-made sand concrete regulator of the present invention has green and environmentally friendly ingredients, low production cost, and is easy to promote and apply. DETAILED DESCRIPTION

[0024] Example 1

[0025] A machine-made sand concrete mixture and a workability regulator include diphenolic acid, triethanolamine, 2-methyl-2-propene-1-ol, trifluoromethanesulfonic acid, diethylene glycol monoacrylate, 2-acrylamido-2-methylpropanesulfonic acid, ammonium bisulfite, ammonium persulfate, and deionized water. The composition of the diphenolic acid, triethanolamine, 2-methyl-2-propene-1-ol, trifluoromethanesulfonic acid, diethylene glycol monoacrylate, 2-acrylamido-2-methylpropanesulfonic acid, ammonium bisulfite, ammonium persulfate, and deionized water is as follows in parts by weight: 286 parts of diphenolic acid, 177 parts of triethanolamine, 72 parts of 2-methyl-2-propene-1-ol, 30 parts of trifluoromethanesulfonic acid, 320 parts of diethylene glycol monoacrylate, 150 parts of 2-acrylamido-2-methylpropanesulfonic acid, 5 parts of ammonium bisulfite, 10 parts of ammonium persulfate, and 1000 parts of deionized water.

[0026] A method for preparing a machine-made sand concrete mixture and a workability regulator comprises the following steps:

[0027] S1. Add 286 parts of diphenolic acid, 177 parts of triethanolamine, 72 parts of 2-methyl-2-propene-1-ol, and 30 parts of trifluoromethanesulfonic acid to a reactor, mix them evenly, and react at 120° C. for 6 hours, then cool to room temperature and add 200 parts of deionized water to obtain Liquid A.

[0028] S2. Take 320 parts of diethylene glycol monoacrylate, 150 parts of 2-acrylamido-2-methylpropanesulfonic acid and 5-10 parts of ammonium bisulfite, and dissolve them in 600 parts of deionized water to obtain Liquid B;

[0029] S3. Dissolve 10 parts of ammonium persulfate in 50 parts of deionized water to obtain liquid C;

[0030] S4. Pour the remaining deionized water into the reactor, heat it to 60°C, and then start stirring. Then, add liquid A, liquid B, and liquid C dropwise respectively. Continue adding for 3 hours and complete the addition. Keep warm for 0.5 hours, and then cool to room temperature to obtain a machine-made sand concrete mixture and workability regulator.

[0031] Example 2

[0032] A machine-made sand concrete mixture and a workability regulator include diphenolic acid, monoethanoldiisopropanolamine, 2-methyl-2-propene-1-ol, trifluoromethanesulfonic acid, ethylene glycol diacrylate, 2-acrylamido-2-methylpropanesulfonic acid, ammonium bisulfite, ammonium persulfate, and deionized water. The composition of the diphenolic acid, monoethanoldiisopropanolamine, 2-methyl-2-propene-1-ol, trifluoromethanesulfonic acid, ethylene glycol diacrylate, 2-acrylamido-2-methylpropanesulfonic acid, ammonium bisulfite, ammonium persulfate, and deionized water is as follows in parts by weight: 372 parts of diphenolic acid, 88 parts of monoethanoldiisopropanolamine, 144 parts of 2-methyl-2-propene-1-ol, 10 parts of trifluoromethanesulfonic acid, 640 parts of ethylene glycol diacrylate, 100 parts of 2-acrylamido-2-methylpropanesulfonic acid, 10 parts of ammonium bisulfite, 5 parts of ammonium persulfate, and 2000 parts of deionized water.

[0033] A method for preparing a machine-made sand concrete mixture and a workability regulator comprises the following steps:

[0034] S1, 372 parts of diphenolic acid, 88 parts of monoethanoldiisopropanolamine, 144 parts of 2-methyl-2-propylene-1-ol and 10 parts of trifluoromethanesulfonic acid were added to a reactor, and the mixture was uniformly mixed. After uniform mixing, the mixture was reacted at a temperature of 180° C. After the reaction for 3 hours, the mixture was cooled to room temperature and 300 parts of deionized water were added to obtain Liquid A;

[0035] S2. Take 640 parts of ethylene glycol diacrylate, 100 parts of 2-acrylamido-2-methylpropanesulfonic acid, and 10 parts of ammonium bisulfite, and dissolve them in 400 parts of deionized water to obtain Liquid B;

[0036] S3. Dissolve 5 to 10 parts of ammonium persulfate in 50 parts of deionized water to obtain liquid C;

[0037] S4. Pour the remaining deionized water into the reactor, heat it to 90°C, and then start stirring. Then, add liquid A, liquid B, and liquid C dropwise respectively. Continue adding for 2 hours and complete the addition. Keep warm for 1 hour, and then cool to room temperature to obtain a machine-made sand concrete mixture and workability regulator.

[0038] Example 3

[0039] A machine-made sand concrete mixture and a workability regulator comprise diphenolic acid, diethanol monoisopropanolamine, 2-methyl-2-propene-1-ol, trifluoromethanesulfonic acid, diethylene glycol monoacrylate, 2-acrylamido-2-methylpropanesulfonic acid, ammonium bisulfite, ammonium persulfate, and deionized water. The mixture, in parts by weight, comprises: 300 parts of diphenolic acid, 150 parts of diethanol monoisopropanolamine, 85 parts of 2-methyl-2-propene-1-ol, 20 parts of trifluoromethanesulfonic acid, 500 parts of diethylene glycol monoacrylate, 120 parts of 2-acrylamido-2-methylpropanesulfonic acid, 8 parts of ammonium bisulfite, 8 parts of ammonium persulfate, and 1500 parts of deionized water.

[0040] A method for preparing a machine-made sand concrete mixture and a workability regulator comprises the following steps:

[0041] S1, add 300 parts of diphenolic acid, 150 parts of diethanol monoisopropanolamine, 85 parts of 2-methyl-2-propylene-1-ol and 20 parts of trifluoromethanesulfonic acid to a reactor, mix them evenly, react at 160 ° C. after mixing evenly, react for 4 hours, cool to room temperature and add 250 parts of deionized water to obtain liquid A;

[0042] S2. Take 500 parts of diethylene glycol monoacrylate, 120 parts of 2-acrylamido-2-methylpropanesulfonic acid, and 8 parts of ammonium bisulfite, and dissolve them in 500 parts of deionized water to obtain Liquid B;

[0043] S3. Dissolve 8 parts of ammonium persulfate in 50 parts of deionized water to obtain liquid C;

[0044] S4. Pour the remaining deionized water into the reactor, heat it to 70°C, and then start stirring. Then, add liquid A, liquid B, and liquid C dropwise respectively. Continue adding for 2.5 hours and complete the addition. Keep warm for 0.8 hours and then cool to room temperature to obtain the machine-made sand concrete mixture and workability regulator.

[0045] Example 4

[0046] A machine-made sand concrete mixture and a workability regulator, comprising diphenolic acid, olamine, 2-methyl-2-propene-1-ol, trifluoromethanesulfonic acid, unsaturated carboxylic acid ester, 2-acrylamido-2-methylpropanesulfonic acid, ammonium bisulfite, ammonium persulfate and deionized water, wherein the weight ratio of the mixture is 1:1. The composition is as follows: 320 parts of diphenolic acid, 132 parts of alcoholamine, 125 parts of 2-methyl-2-propene-1-ol, 23 parts of trifluoromethanesulfonic acid, 465 parts of unsaturated carboxylic acid ester, 125 parts of 2-acrylamido-2-methylpropanesulfonic acid, 7 parts of ammonium bisulfite, 9 parts of ammonium persulfate and 1400 parts of deionized water; the alcoholamine is one of monoethanol diisopropanolamine and diethanol monoisopropanolamine; the unsaturated carboxylic acid ester is one of diethylene glycol monoacrylate and ethylene glycol diacrylate.

[0047] A method for preparing a machine-made sand concrete mixture and a workability regulator comprises the following steps:

[0048] S1, add 320 parts of diphenolic acid, 132 parts of monoethanoldiisopropanolamine, 125 parts of 2-methyl-2-propylene-1-ol and 23 parts of trifluoromethanesulfonic acid to a reactor, mix them evenly, react at a temperature of 120-180° C., react for 3-6 hours, cool to room temperature and add 200-300 parts of deionized water to obtain liquid A;

[0049] S2. Take 465 parts of unsaturated carboxylic acid ester, 125 parts of 2-acrylamido-2-methylpropanesulfonic acid and 7 parts of ammonium bisulfite, and dissolve them in 400-600 parts of deionized water to obtain liquid B;

[0050] S3. Dissolve 9 parts of ammonium persulfate in 50 parts of deionized water to obtain liquid C;

[0051] S4. Put the remaining deionized water into the reactor, heat it to 60-90°C, then start stirring, and then add liquid A, liquid B, and liquid C dropwise respectively. Continue adding for 2-3 hours and complete the addition. Keep warm for 0.5-1 hour, and then cool to room temperature to obtain a machine-made sand concrete mixture and workability regulator.

[0052] First, diphenolic acid undergoes an esterification reaction with alcoholamine and 2-methyl-2-propene-1-ol, and then polymerizes with unsaturated carboxylic acid ester and 2-acrylamido-2-methylpropanesulfonic acid. The aromatic hydrocarbons and hydrophilic amino and hydroxyl groups in the diphenolic acid have a hydrophilic effect in the multiphase heterogeneous system of concrete. They can enhance the ability of oxygen atoms on the hydroxyl, amide and sulfonic acid groups to associate with water to form hydrogen bonds, converting free water into cement paste bound water, achieving high water retention and adhesion. At the same time, the surface tension of the solution is also reduced, allowing cement particles to more completely contact with water, accelerating water wetting and penetration of cement particles and cement hydration. In addition, the diphenolic acid easily forms covalent bonds and complexes with metal ions, forming relatively stable complexes with metal ions. These complexes form numerous soluble regions in the solution, increasing the diffusion rate of hydration products, thereby shortening the latent period of cement hydration and facilitating early strength improvement.

[0053] In order to better illustrate the technical effects of the present invention, the following experiments were performed to verify:

[0054] The slump, expansion, pressure bleeding rate, air content and compressive strength of concrete are all tested in accordance with GB / T50080-2016 "Standard for Test Methods for Performance of Ordinary Concrete Mixtures". The commonly used machine-made sand C30 concrete mix ratio is cement: fly ash: machine-made sand: crushed stone: water: polycarboxylic acid water-reducing agent: machine-made sand concrete regulator = 300:80:810:1020:170:7.6:2; wherein: cement is P.O42.5, fly ash is Class I ash, commercially available machine-made sand is medium sand (methylene blue value is 1.0, stone powder content is 7%), crushed stone particle size is 5-25 mm, commercially available polycarboxylic acid high-performance water-reducing agent has a solid content of 10% and an admixture amount of 2% of the amount of cementitious material, water is tap water, and the special concrete machine-made sand concrete and workability regulator of the present invention are 2.0 kg / m 3 , the test results are shown in Table 1.

[0055] As above, the mix ratio of C30 machine-made sand concrete is cement: fly ash: machine-made sand: crushed stone: water: polycarboxylate water-reducing agent: machine-made sand concrete regulator = 300:80:810:1020:170:7.6:2; wherein: cement is P.O42.5, fly ash is grade I, commercially available machine-made sand is medium sand (methylene blue value is 2.0, stone powder content is 12%), crushed stone particle size is 5-25 mm, the same commercially available polycarboxylate high-performance water-reducing agent has a solid content of 10% and an admixture amount of 2.3% of the amount of cementitious material, water is tap water, and the special concrete machine-made sand concrete regulator of the present invention is 2.0 kg / m 3 , the test results are shown in Table 2.

[0056] Among them, the blank test is the concrete without adding artificial sand and workability regulator.

[0057] Table 1 Performance test results

[0058]

[0059] Table 2 Performance test results

[0060]

[0061] From the analysis of Table 1, it can be concluded that compared with the blank, the addition of 2kg / m3 of commercially available machine-made sand concrete regulator 3 After the addition of the concrete, the workability of the fresh concrete is improved and the water bleeding rate of the concrete is reduced. However, the slump and expansion of the concrete mixture are significantly lost over time, which will have an adverse effect on the construction of ready-mixed concrete. From the comparison of the slump, expansion, inverted slump cone retention time and pressure water bleeding rate of the concrete mixture, it can be seen that the machine-made sand concrete regulator of the present invention significantly improves the cohesion, water retention and workability of the concrete mixture, which can meet the needs of engineering pumping construction.

[0062] From the analysis in Table 2, it can be concluded that when the machine-made sand is medium sand (methylene blue value is 2.0, stone powder content is 12%), it means that when the mud content and stone powder content in the machine-made sand are increased, the initial workability of the blank concrete is also significantly improved, but the slump and expansion loss over time is obvious, which is not conducive to the construction of engineering pumped concrete. When 2kg / m3 of commercially available machine-made sand concrete regulator is added, the initial workability of the blank concrete is significantly improved. 3 After that, the workability of fresh concrete is further improved and the water bleeding rate of concrete is further reduced. However, the slump and expansion of the concrete mixture will be significantly lost over time, which will have an adverse effect on the construction of ready-mixed concrete.

[0063] The workability of fresh concrete is a comprehensive reflection of its fluidity, cohesiveness, and water retention. These three properties are interconnected but often contradictory. Therefore, under certain construction processes, the workability of fresh concrete represents a contradictory unity of these three properties. The workability of a concrete mixture is a comprehensive concept that is difficult to fully and appropriately describe using a single assessment method. The slump test is typically used to measure the fluidity of a concrete mixture.

[0064] From this, it can be analyzed that after adding the concrete machine-made sand concrete regulator of the present invention, the initial slump and expansion of the concrete increase, indicating that the workability of the machine-made sand concrete is significantly improved, and the slump and expansion of the concrete mixture lose little over time, and there is almost no adverse effect on the construction of ready-mixed concrete, indicating that the concrete machine-made sand concrete regulator of the present invention has a certain effect of preventing mud powder from adsorbing admixtures. The improvement in the workability of concrete is also beneficial to promoting the improvement of the 7d and 28d compressive strength of concrete.

[0065] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0066] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A machine-made sand concrete mixture and workability regulator, characterized in that: The invention comprises diphenolic acid, olamine, 2-methyl-2-propene-1-ol, trifluoromethanesulfonic acid, unsaturated carboxylic acid ester, 2-acrylamido-2-methylpropanesulfonic acid, ammonium bisulfite, ammonium persulfate and deionized water, wherein the bisphenolic acid, olamine, 2-methyl-2-propene-1-ol, trifluoromethanesulfonic acid, unsaturated carboxylic acid ester, 2-acrylamido-2-methylpropanesulfonic acid, ammonium bisulfite, ammonium persulfate and deionized water are composed of the following weight parts: 286-372 parts of diphenolic acid, 88-177 parts of olamine, 72-144 parts of 2-methyl-2-propene-1-ol, 10-30 parts of trifluoromethanesulfonic acid, 320-640 parts of unsaturated carboxylic acid ester, 100-150 parts of 2-acrylamido-2-methylpropanesulfonic acid, 5-10 parts of ammonium bisulfite, 5-10 parts of ammonium persulfate and 1000-2000 parts of deionized water; The alcohol amine is one of triethanolamine, monoethanoldiisopropanolamine and diethanolmonoisopropanolamine; The unsaturated carboxylic acid ester is one of diethylene glycol monoacrylate and ethylene glycol diacrylate; The method for preparing the machine-made sand concrete mixture and the workability regulator comprises the following steps: S1, add 286-372 parts of diphenolic acid, 88-177 parts of monoethanoldiisopropanolamine, 72-144 parts of 2-methyl-2-propylene-1-ol and 10-30 parts of trifluoromethanesulfonic acid into a reactor, mix them evenly, react at a certain temperature after mixing evenly, react for a period of time, cool to room temperature after a period of time and add 200-300 parts of deionized water to obtain liquid A; S2. Take 320-640 parts of unsaturated carboxylic acid ester, 100-150 parts of 2-acrylamido-2-methylpropanesulfonic acid and 5-10 parts of ammonium bisulfite, and dissolve them in 400-600 parts of deionized water to obtain liquid B; S3. Dissolve 5 to 10 parts of ammonium persulfate in 50 parts of deionized water to obtain liquid C; S4. Put the remaining deionized water into the reactor, heat it to a certain temperature, and then start stirring. Then, add liquid A, liquid B, and liquid C dropwise respectively, continue to add for a certain period of time and complete the addition, keep warm for a period of time, and then cool to room temperature to obtain a machine-made sand concrete mixture and workability regulator.

2. The machine-made sand concrete mixture and workability regulator according to claim 1, characterized in that: The reaction temperature after uniform mixing in S1 is 120-180° C., and the reaction time is 3-6 hours.

3. The machine-made sand concrete mixture and workability regulator according to claim 1, characterized in that: The certain temperature in S4 is 60-90°C.

4. The machine-made sand concrete mixture and workability regulator according to claim 1, characterized in that: The continuous dripping time in S4 is 2 to 3 hours.

5. The machine-made sand concrete mixture and workability regulator according to claim 1, characterized in that: The holding time in S4 is 0.5 to 1 hour.

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