A viscosity regulator for recycled concrete, a preparation method thereof, and a usage method thereof

Abstract

The present invention belongs to the technical field of construction engineering and relates to a viscosity regulator for recycled concrete, a preparation method thereof and a usage method. By mass parts, it includes the following components: 40 - 80 parts of polybutadiene epoxy resin; 3 - 10 parts of functional polymer; 3 - 20 parts of condensing agent; 2 - 5 parts of amino compound; 2 - 10 parts of stabilizer; 10 - 15 parts of water; the viscosity regulator is cured by CO2 and is water-soluble. In the present invention, through the chemical reaction of polybutadiene epoxy resin and auxiliary agents under the action of water as a solvent, a water-soluble viscosity regulator is prepared. During the preparation of recycled concrete cured by CO2, the viscosity regulator reacts with CO2 carbonization, can penetrate into the pores of the concrete, and reacts with the cement colloid and the surface of the aggregate, thereby further improving the solubility of the viscosity regulator and increasing the stability of the polymer. It enhances the adhesion between the cement paste and the recycled aggregate and reduces cracks.

Description

Technical Field

[0001] The present invention belongs to the technical field of construction engineering, and particularly relates to a viscosity regulator for recycled concrete, a preparation method thereof, and a usage method thereof. Background Art

[0002] A large amount of waste concrete is generated globally every year, mainly from the demolition of old buildings, new construction, and precast component factories. Disposing of this waste concrete not only requires huge costs but also a large amount of storage space, pollutes the environment, and wastes valuable arable land resources. To solve this problem, the recycling of waste concrete has become an important approach, which can not only achieve comprehensive resource utilization but also protect the environment.

[0003] With the increasing attention to environmental issues, the reuse of waste concrete has become a research field of concern in various countries. In particular, the production of recycled aggregates from waste concrete has become one of the important research directions in the engineering and academic fields. This method can effectively reduce the demand for raw stones, relieve the mining pressure, and at the same time reduce the amount of waste concrete to be processed, improving the resource utilization efficiency. By using waste concrete as the raw material for recycled concrete, the recycling of resources can be realized, the environmental burden can be reduced, and sustainable development can be promoted. There are some difficult problems to solve with recycled aggregates as the raw materials for preparing recycled concrete. During the process of manufacturing recycled aggregates from waste concrete, the internal structure of the recycled aggregates will have many tiny cracks due to external forces such as rolling, impact, and grinding. In addition, about 30% of the mortar will adhere to the surface of the recycled coarse aggregates. The strength of this adhered mortar is relatively low, and the porosity is higher than that of natural aggregates, resulting in lower compactness of the recycled aggregate concrete compared to ordinary concrete, thus affecting the performance and quality of the recycled aggregate concrete.

[0004] In view of the above situation, there are usually three main ways to deal with waste concrete: one is to use it as a foundation reinforcement and earthwork backfill material; the second is to prepare new building materials such as non-fired bricks and dry-mixed mortar; the third is to use it as the raw material for recycled concrete to produce recycled cement and recycled aggregates, etc. When waste concrete is used as the coarse aggregate for producing recycled concrete after CO2 curing treatment, during the crushing process of the waste concrete, the shape of the coarse aggregate may change, such as fragmentation and angular wear, and there is often residual adhered mortar on the surface of the coarse aggregate, which will lead to a higher porosity and lower strength of the concrete, affecting the compactness and mechanical properties of the recycled concrete and the application of waste concrete as the coarse aggregate for producing recycled concrete.

[0005] The information disclosed in this background art section is only intended to deepen the understanding of the overall background art of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0006] The first object of the present invention is to provide a viscosity regulator for recycled concrete, which is used in the preparation of recycled concrete. By reacting with cement colloids and the surface of aggregates, the adhesion between the cement paste and recycled aggregates is enhanced, and the generation of cracks is reduced.

[0007] The above technical object of the present invention is achieved through the following technical solutions:

[0008] A viscosity regulator for recycled concrete, calculated by mass parts, includes the following components:

[0009] 40 - 80 parts of polybutadiene epoxy resin;

[0010] 3 - 10 parts of functional polymer;

[0011] 3 - 20 parts of condensing agent;

[0012] 2 - 5 parts of amino compound;

[0013] 2 - 10 parts of stabilizer;

[0014] 10 - 15 parts of water;

[0015] The viscosity regulator is cured by CO2 and is water-soluble.

[0016] Preferably, the functional polymer is acrylic acid and benzoyl peroxide, and the mixing mass ratio of acrylic acid and benzoyl peroxide is 1 - 2:1. Benzoyl peroxide generates free radicals by cleavage, thereby initiating the copolymerization reaction of acrylic acid and polybutadiene epoxy resin. Acrylic acid has good water solubility and modification effect. By ring-opening polymerization reaction, acrylic acid monomers are connected to the molecular chain of polybutadiene epoxy resin, and acrylic acid functional groups are introduced to modify polybutadiene epoxy resin into water-soluble polybutadiene epoxy resin. A copolymer with the characteristics and properties of acrylic acid and polybutadiene epoxy resin is formed.

[0017] Preferably, the condensing agent is one or more of polyhydroxyethanol, polyethylene glycol, and polyhydroxyacetic acid. The addition time of the condensing agent is 2 - 4 minutes later than the addition time of the functional polymer. The hydroxyl functional groups in the condensing agent react with the double bonds in acrylic acid and polybutadiene epoxy resin to form a cross-linked structure. Through cross-linking, the strength, hardness, and heat resistance of the material can be improved. In the present invention, hydroxyl functional groups are introduced through a condensation reaction, increasing the water solubility and dispersibility of polybutadiene epoxy resin, and promoting the dissolution and dispersion of the resin in water. By controlling the addition amount and addition timing of the condensing agent, the molecular structure and cross-linking degree of the copolymer in the polymerization reaction can be adjusted, thereby affecting the fluidity, viscosity, heat resistance, and other properties of polybutadiene epoxy resin.

[0018] Preferably, the amino compound is triethylenetetramine or dimethylethylenediamine. The amino compound can promote the carbonization reaction of epoxy resin. After carbon dioxide is introduced, the epoxy groups (nucleophilic) in polybutadiene epoxy resin react with bicarbonate ions (basic) in carbon dioxide to form epoxy resin carbonate. It has good thermal stability and chemical stability. In the polymerization reaction, triethylenetetramine can accelerate the reaction rate, lower the activation energy of the reaction, and accelerate the reaction rate, enabling the reaction to be completed in a shorter time. Dimethylethylenediamine can promote the above polymerization reaction, accelerate the curing and crosslinking process of polybutadiene epoxy resin, and contribute to accelerating the polymerization reaction rate. At the same time, dimethylethylenediamine has a penetration ability and can penetrate into concrete or recycled aggregates, react with salt ions in water to form insoluble precipitates, fill pores, reduce the density of concrete, and thus reduce the permeability and water seepage ability of concrete.

[0019] Preferably, the stabilizer is one or more of polyvinylpyrrolidone and polyacrylic acid. The stabilizer has good dispersion performance and can uniformly disperse the particles in the reaction or in the solution and prevent their aggregation and precipitation. This helps to improve the uniformity and stability of the reaction, avoid uneven reactant distribution and accumulation, and inhibit the occurrence of adverse reactions such as polymer decomposition and color change. When selecting a suitable stabilizer, factors such as the characteristics of the polymer, the use environment, and the expected service life need to be considered.

[0020] Preferably, the water is tap water.

[0021] The second object of the present invention is to provide a preparation method of a viscosity regulator for recycled concrete, which has the same technical effects.

[0022] The above technical object of the present invention is achieved by the following technical solutions:

[0023] A preparation method of a viscosity regulator for recycled concrete includes the following operation steps

[0024] S1: Weigh each component according to the ratio;

[0025] S2: Mix the functional polymer, amino compound and stabilizer to obtain mixture one;

[0026] S3: Introduce the first mixture, polybutadiene epoxy resin, and water into a mixing device for a mixing reaction. After 2 - 4 minutes, add a condensing agent and mix evenly to obtain a second mixture. The specific reaction time is 1 - 3 hours, and the reaction temperature is 60 - 80°C. An appropriate reaction temperature can increase the reaction rate, control the occurrence of side reactions, reduce the generation of by-products, ensure the stability of reactants and catalysts, and prevent unnecessary degradation or inactivation. An appropriate reaction time can ensure sufficient reaction between reactants, avoid overreaction, and a reasonable reaction time can save production costs and avoid wasting time.

[0027] S4: Introduce carbon dioxide into the second mixture and react at 60 - 80°C for 2 - 4 hours to obtain a regenerated concrete viscosity regulator with good adhesion to aggregates and water solubility.

[0028] The present invention uses the carbonization reaction of water-soluble polybutadiene epoxy resin with CO2 to prepare a regenerated concrete viscosity regulator, thereby further improving the solubility of the viscosity regulator, increasing the stability of the polymer, and providing additional functionality. Introducing carbon dioxide plays the role of a carbon source in the process of preparing water-soluble polybutadiene epoxy resin. It can promote the ring-opening reaction of the epoxy groups of the epoxy resin to generate a carbonate structure. And it is sealed in the cement-based material through a filling effect, thereby achieving the purpose of solidifying and storing CO2. This not only helps reduce CO2 emissions and mitigate the impact on climate change but also provides additional environmental benefits for cement-based materials. By converting CO2 into a polymer and applying it to cement-based materials, the demand for traditional raw materials can be reduced, the environmental impact can be minimized, and the sustainable development of building materials can be promoted. The viscosity regulator can chemically react with the cement-based materials in the concrete to form a strong bond. It can penetrate into the pores of the concrete and react with the cement gel and the surface of the aggregates to form chemical bond connections, improving the bond strength. After adding the viscosity regulator to the cement-based material, the durability, crack resistance, impermeability, and other properties of the material can be enhanced. In addition, the presence of carbon dioxide helps regulate the acidity and alkalinity of the reaction system, optimize the reaction conditions, to obtain a water-soluble regenerated concrete viscosity regulator for use in the preparation of regenerated concrete. By reacting with the cement gel and the surface of the aggregates, the adhesion between the cement paste and the regenerated aggregates can be enhanced, and the generation of cracks can be reduced.

[0029] The third object of the present invention is to provide a method for using a regenerated concrete viscosity regulator. When applied to regenerated concrete, it can reduce the microcracks and pores inside the regenerated coarse aggregates, significantly improve its mechanical properties and strength, and at the same time increase the reaction rate of the concrete.

[0030] After the regenerated concrete is formed, introduce CO2 for curing for 10 - 12 hours.

[0031] The above technical objectives of the present invention are achieved by the following technical solutions:

[0032] Apply a viscosity regulator to recycled concrete, and the dosage of the viscosity regulator is 0.5% - 1.5% of the mass of recycled coarse aggregate. After the concrete is formed, CO2 is introduced for curing, so that a mineralization reaction occurs between the CO2 gas and other alkaline calcium and magnesium components to form carbonate products, and it promotes the reaction between the amorphous silicate in the recycled aggregate and CO2, further solidifying and carbonizing the concrete structure. The appropriate dosage of the viscosity regulator can reduce the viscosity of the reaction slurry, improve its fluidity, and make the mixing reaction smoother; it helps to increase the diffusion rate between the components in the reaction slurry, promote the reaction, and thus enable the recycled coarse aggregate to react more fully with carbon dioxide during curing; the appropriate dosage range of the viscosity regulator helps to improve the fluidity and uniformity of the carbon dioxide-cured recycled coarse aggregate reaction system, and improve the reaction efficiency and product quality.

[0033] In summary, the present invention has the following beneficial effects:

[0034] (1) By chemically reacting polybutadiene epoxy resin with an auxiliary agent under the action of water as a solvent, the present invention prepares a water-soluble viscosity regulator. During the preparation process of the viscosity regulator, the polybutadiene epoxy resin undergoes a carbonization reaction with CO2, which can penetrate into the pores of the concrete and react with the cement gel and the surface of the aggregate, thereby further improving the solubility of the viscosity regulator and increasing the stability of the polymer. It enhances the adhesion between the cement paste and the recycled aggregate and reduces cracks.

[0035] (2) This application conducts CO2 curing after the concrete is formed, using the CO2 gas to react with the cement in the concrete to form carbonates. The carbonization process helps to improve the strength, durability, and carbon capture ability of the concrete, while reducing the dependence on traditional curing methods and materials. CO2-cured recycled concrete utilizes the characteristics of CO2 solidification and carbonization to aim for a more sustainable and environmentally friendly concrete material. Recycled concrete has certain engineering application potential and is regarded as an emerging technology that can replace traditional curing methods. Specific Embodiments

[0036] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention objectives, a viscosity regulator for recycled concrete, its preparation method, and its usage method proposed according to the present invention are described in detail below in terms of their specific embodiments, characteristics, and effects.

[0037] Sources of raw materials used in the examples:

[0038]

[0039]

[0040] Example 1

[0041] A viscosity regulator for recycled concrete, by mass fraction, comprises the following components:

[0042] 80 parts of polybutadiene epoxy resin; 2 parts of acrylic acid; 1 part of benzoyl peroxide; 3 parts of polyhydroxyethanol; 2 parts of dimethylethylenediamine; 2 parts of polyvinylpyrrolidone; 10 parts of water;

[0043] The viscosity regulator is cured by CO2 and is water-soluble.

[0044] A preparation method of a viscosity regulator for recycled concrete comprises the following operating steps

[0045] S1: Weigh each component according to the proportion;

[0046] S2: Mix the acrylic acid, benzoyl peroxide, dimethylethylenediamine and polyvinylpyrrolidone to obtain mixture one;

[0047] S3: Introduce mixture one, polybutadiene epoxy resin and water into a mixing device for mixing reaction, add polyhydroxyethanol after 2 min and mix evenly to obtain mixture two; The specific reaction time is 1 h and the reaction temperature is 60 °C.

[0048] S4: Introduce carbon dioxide into mixture two and react at 60 °C for 4 h to obtain a viscosity regulator for recycled concrete.

[0049] A using method of a viscosity regulator for recycled concrete, apply the viscosity regulator to recycled concrete, carry out CO2 curing for 12 h after the concrete is formed, and the dosage of the viscosity regulator is 0.5% of the mass of recycled coarse aggregate.

[0050] Example 2

[0051] A viscosity regulator for recycled concrete, by mass fraction, comprises the following components:

[0052] 80 parts of polybutadiene epoxy resin; 6 parts of acrylic acid; 4 parts of benzoyl peroxide; 20 parts of polyhydroxyacetic acid; 5 parts of triethylenetetramine; 10 parts of polyacrylic acid; 15 parts of water;

[0053] The viscosity regulator is cured by CO2 and is water-soluble.

[0054] S1: Weigh each component according to the proportion;

[0055] S2: Mix the acrylic acid, benzoyl peroxide, triethylenetetramine and polyacrylic acid to obtain mixture one;

[0056] S3: introducing the mixture 1, polybutadiene epoxy resin and water into a mixing device for mixing reaction, adding polyhydroxyacetic acid after 3.5 minutes and mixing evenly to obtain a mixture 2; the specific reaction time is 1 hour, and the reaction temperature is 60°C.

[0057] S4: introducing carbon dioxide into the second mixture and reacting at 70° C. for 3 hours to obtain a recycled concrete viscosity regulator.

[0058] A method for using a recycled concrete viscosity regulator comprises applying the viscosity regulator to recycled concrete, performing CO2 curing for 12 hours after the concrete is formed, and the dosage of the viscosity regulator is 0.5% of the mass of recycled coarse aggregate.

[0059] Example 3

[0060] A recycled concrete viscosity regulator, comprising the following components in parts by mass:

[0061] 50 parts of polybutadiene epoxy resin; 4 parts of acrylic acid; 4 parts of benzoyl peroxide; 14 parts of polyhydroxyethanol; 5 parts of dimethylethylenediamine; 8 parts of polyvinylpyrrolidone; 14 parts of water;

[0062] The viscosity modifier is cured by CO2 and is water-soluble.

[0063] A method for preparing a recycled concrete viscosity regulator comprises the following steps:

[0064] S1: Weigh each component in proportion;

[0065] S2: mixing the acrylic acid, benzoyl peroxide, dimethylethylenediamine and polyvinylpyrrolidone to obtain a mixture 1;

[0066] S3: introducing the mixture 1, polybutadiene epoxy resin and water into a mixing device for mixing reaction, adding polyhydroxyethanol after 2 minutes and mixing evenly to obtain a mixture 2; the specific reaction time is 2 hours, and the reaction temperature is 60°C.

[0067] S4: introducing carbon dioxide into the second mixture and reacting at 60° C. for 2 hours to obtain a recycled concrete viscosity regulator.

[0068] A method for using a recycled concrete viscosity regulator comprises applying the viscosity regulator to recycled concrete, performing CO2 curing for 12 hours after the concrete is formed, and the dosage of the viscosity regulator is 0.5% of the mass of recycled coarse aggregate.

[0069] Example 4

[0070] A recycled concrete viscosity regulator, comprising the following components in parts by mass:

[0071] 60 parts of polybutadiene epoxy resin; 3 parts of acrylic acid; 3 parts of benzoyl peroxide; 3 parts of polyethylene glycol; 3 parts of triethylenetetramine; 2 parts of polyacrylic acid; 12 parts of water;

[0072] The viscosity regulator is cured by CO2 and is water-soluble.

[0073] A preparation method of a viscosity regulator for recycled concrete includes the following operation steps:

[0074] S1: Weigh each component according to the proportion;

[0075] S2: Mix the acrylic acid, benzoyl peroxide, triethylenetetramine, and polyacrylic acid to obtain mixture one;

[0076] S3: Introduce mixture one, polybutadiene epoxy resin, and water into a mixing device for mixing reaction. After 2 minutes, add polyethylene glycol and mix evenly to obtain mixture two; The specific reaction time is 1 hour, and the reaction temperature is 60 °C.

[0077] S4: Pass carbon dioxide into mixture two and react at 70 °C for 2 hours to obtain a viscosity regulator for recycled concrete.

[0078] A usage method of a viscosity regulator for recycled concrete is to apply the viscosity regulator to recycled concrete and conduct CO2 curing for 12 hours after the concrete is formed. The dosage of the viscosity regulator is 0.5% of the mass of recycled coarse aggregate.

[0079] Comparative Example 1

[0080] A viscosity regulator for recycled concrete, by mass, includes the following components:

[0081] 80 parts of polybutadiene epoxy resin; 2 parts of acrylic acid; 3 parts of polyhydroxyethanol; 2 parts of dimethylethylenediamine; 2 parts of polyvinylpyrrolidone; 10 parts of water;

[0082] The viscosity regulator is water-soluble.

[0083] A preparation method of a viscosity regulator for recycled concrete includes the following operation steps:

[0084] S1: Weigh each component according to the proportion;

[0085] S2: Mix the acrylic acid, dimethylethylenediamine, and polyvinylpyrrolidone to obtain mixture one;

[0086] S3: Introduce mixture one, polybutadiene epoxy resin, and water into a mixing device for mixing reaction. After 2 minutes, add polyhydroxyethanol and mix evenly to obtain mixture two; The specific reaction time is 1 hour, and the reaction temperature is 60 °C.

[0087] S4: Introduce carbon dioxide into the second mixture and react at 60 °C for 4 h to obtain a viscosity regulator for recycled concrete.

[0088] A method for using a viscosity regulator for recycled concrete, applying the viscosity regulator to recycled concrete, and performing CO2 curing for 12 h after the concrete is formed. The dosage of the viscosity regulator is 0.5% of the mass of the recycled coarse aggregate.

[0089] Comparative Example 2

[0090] A viscosity regulator for recycled concrete, calculated by mass parts, includes the following components:

[0091] 80 parts of polybutadiene epoxy resin; 2 parts of acrylic acid; 1 part of benzoyl peroxide; 2 parts of dimethylethylenediamine; 2 parts of polyvinylpyrrolidone; 10 parts of water;

[0092] The viscosity regulator is water-soluble.

[0093] A preparation method of a viscosity regulator for recycled concrete, including the following operation steps

[0094] S1: Weigh each component according to the ratio;

[0095] S2: Mix the acrylic acid, benzoyl peroxide, dimethylethylenediamine and polyvinylpyrrolidone to obtain the first mixture;

[0096] S3: Introduce the first mixture, polybutadiene epoxy resin and water into a mixing device for mixing reaction to obtain the second mixture; The specific reaction time is 1 h and the reaction temperature is 60 °C.

[0097] S4: Introduce carbon dioxide into the second mixture and react at 60 °C for 4 h to obtain a viscosity regulator for recycled concrete.

[0098] A method for using a viscosity regulator for recycled concrete, applying the viscosity regulator to recycled concrete, and performing CO2 curing for 12 h after the concrete is formed. The dosage of the viscosity regulator is 0.5% of the mass of the recycled coarse aggregate.

[0099] Comparative Example 3

[0100] A viscosity regulator for recycled concrete, calculated by mass parts, includes the following components:

[0101] 80 parts of polybutadiene epoxy resin; 2 parts of acrylic acid; 1 part of benzoyl peroxide; 3 parts of polyhydroxyethanol; 2 parts of polyvinylpyrrolidone; 10 parts of water;

[0102] The viscosity regulator is water-soluble.

[0103] A method for preparing a recycled concrete viscosity regulator comprises the following steps:

[0104] S1: Weigh each component in proportion;

[0105] S2: mixing the acrylic acid, benzoyl peroxide and polyvinyl pyrrolidone to obtain a mixture 1;

[0106] S3: introducing the mixture 1, polybutadiene epoxy resin and water into a mixing device for mixing reaction, adding polyhydroxyethanol after 2 minutes and mixing evenly to obtain a mixture 2; the specific reaction time is 1 hour, and the reaction temperature is 60°C.

[0107] S4: introducing carbon dioxide into the second mixture and reacting at 60° C. for 4 hours to obtain a recycled concrete viscosity regulator.

[0108] A method for using a recycled concrete viscosity regulator comprises applying the viscosity regulator to recycled concrete, performing CO2 curing for 12 hours after the concrete is formed, and the dosage of the viscosity regulator is 0.5% of the mass of recycled coarse aggregate.

[0109] Comparative Example 4

[0110] A recycled concrete viscosity regulator, comprising the following components in parts by mass:

[0111] 80 parts of polybutadiene epoxy resin; 2 parts of acrylic acid; 1 part of benzoyl peroxide; 3 parts of polyhydroxyethanol; 10 parts of dimethylethylenediamine; 2 parts of polyvinylpyrrolidone; 10 parts of water;

[0112] The viscosity modifier is cured by CO2 and is water-soluble.

[0113] A method for preparing a recycled concrete viscosity regulator comprises the following steps:

[0114] S1: Weigh each component in proportion;

[0115] S2: mixing the acrylic acid, benzoyl peroxide, dimethylethylenediamine and polyvinylpyrrolidone to obtain a mixture 1;

[0116] S3: introducing the mixture 1, polybutadiene epoxy resin and water into a mixing device for mixing reaction, adding polyhydroxyethanol after 2 minutes and mixing evenly to obtain a mixture 2; the specific reaction time is 1 hour, and the reaction temperature is 60°C.

[0117] S4: introducing carbon dioxide into the second mixture and reacting at 60° C. for 4 hours to obtain a recycled concrete viscosity regulator.

[0118] A method for using a viscosity regulator for recycled concrete, which applies the viscosity regulator to recycled concrete and performs CO2 curing for 12 h after the concrete is formed. The dosage of the viscosity regulator is 0.5% of the mass of recycled coarse aggregate.

[0119] Experimental data

[0120] The formed concrete prepared in Examples 1 to 4 and Comparative Examples 1 to 4 was tested, and the test data are shown in the following table:

[0121]

[0122] Compared with Example 1, in Comparative Example 1, benzoyl peroxide was not added, and a functional polymer could not be formed, resulting in poor water solubility of polybutadiene epoxy resin. When it was added to concrete as a viscosity regulator, the high voids in the concrete were not improved, and the strength remained low.

[0123] Compared with Example 1, in Comparative Example 2, the condensing agent polyhydroxyethanol was not added, and a cross-linked structure was not formed, so that the strength of the material was not improved.

[0124] Compared with Example 1, in Comparative Example 3, the amino compound was not added, and the carbonization reaction rate of the epoxy resin was not high, and sufficient epoxy resin carbonate could not be generated. At the same time, no excess dimethylethylenediamine penetrated into the concrete to fill the voids, and the compactness of the concrete was poor, and the strength was lower than that of Example 1.

[0125] Compared with Example 1, in Comparative Example 4, an excessive amount of amino compound was added, the carbon dioxide carbonization reaction rate was too fast, the forward conversion rate of the addition reaction was low, and the proportion of by-products was relatively large. Therefore, the strength of Example 1 of this application could not be achieved.

[0126] Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A viscosity regulator for recycled concrete, characterized in that, By mass parts, it includes the following components: 40 - 80 parts of polybutadiene epoxy resin; 3 - 10 parts of functional polymer; 3 - 20 parts of condensing agent; 2 - 5 parts of amino compound; 2 - 10 parts of stabilizer; 10 - 15 parts of water; The viscosity regulator is cured by CO2, the viscosity regulator is water-soluble, the functional polymer is a mixture of acrylic acid and benzoyl peroxide, and the mixing mass ratio of acrylic acid and benzoyl peroxide is 1 - 2:

1. The condensing agent is one or more of polyhydroxyethanol, polyethylene glycol, and polyhydroxyacetic acid.

2. The viscosity regulator for recycled concrete according to claim 1, characterized in that, The amino compound is triethylenetetramine or dimethylethylenediamine.

3. A viscosity regulator for recycled concrete according to claim 1, characterized in that, The stabilizer is one or a mixture of polyvinylpyrrolidone and polyacrylic acid.

4. The preparation method of the recycled concrete viscosity regulator according to any one of claims 1 to 3, characterized in that, It includes the following operation steps: S1: Weigh each component according to the proportion; S2: Mix the functional polymer, amino compound, and stabilizer to obtain mixture one; S3: Introduce mixture one, polybutadiene epoxy resin, and water into a mixing device for mixing reaction. After 2 - 4 minutes, add the condensing agent and mix evenly to obtain mixture two; S4: Introduce carbon dioxide into mixture two and react at 60 - 80 °C for 2 - 4 hours to obtain a viscosity regulator for recycled concrete.

5. The preparation method of the viscosity regulator for recycled concrete according to claim 4, wherein, In step S3, introduce mixture one, polybutadiene epoxy resin, and water into a reaction kettle for mixing reaction. The reaction temperature is 60 - 80 °C, and the reaction time is 1 - 3 hours.

6. The application method of the recycled concrete viscosity regulator according to any one of claims 1 to 3, characterized in that, Apply the viscosity regulator to recycled concrete, and the dosage of the viscosity regulator is 0.5% - 1.5% of the mass of recycled coarse aggregate.

7. The application method of the viscosity regulator for recycled concrete according to claim 6, characterized in that After the recycled concrete is formed, introduce CO2 for curing for 10 - 12 hours.

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