Polymer modified concrete material and preparation method thereof

Abstract

The invention belongs to the technical field of building materials, and particularly relates to a preparation method of a polymer modified concrete material, which comprises the following steps: at normal temperature, adding modified silica powder and rubber powder into a polysiloxane / acrylate blended emulsion, quickly stirring and dispersing for 30-45 minutes, then adding dry stones, ordinary Portland cement and medium sand which are uniformly mixed in advance, uniformly stirring, and finally adding a curing agent for curing, thereby obtaining the polymer modified concrete material. After 28 days, the compressive strength of the polymer modified concrete material is 30-40 MPa, the tensile strength of the polymer modified concrete material is 2-3 MPa, the breaking strength of the polymer modified concrete material is 3-5 MPa, the elastic modulus of the polymer modified concrete material is 2 * 10 < 4 >-3 * 10 < 4 > MPa, and the maximum impermeable water pressure of the polymer modified concrete material can reach 1.4 MPa. Compared with traditional cement concrete, the concrete has the remarkable characteristics of high strength and good durability, has excellent impermeability and frost resistance, and can be widely applied to bridge deck engineering, tunnels, ports, expressways and other concrete engineering.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and particularly relates to a polymer modified concrete material and a preparation method thereof. Background Art

[0002] Ordinary cement concrete is a brittle material with weak tensile and flexural strength, impact resistance, waterproof and corrosion resistance, which limits its application in the construction field. Therefore, it is of great significance to develop a high-performance concrete material. However, for a long time, people have only made a lot of efforts to change the brittleness of concrete by adjusting the concrete mix ratio, adding special concrete admixtures, adding fiber materials, etc., and have achieved certain results. With the development of science and technology, the promotion and application of polymer materials, domestic and foreign researchers have begun to study polymer cement concrete, a new type of composite material. For example, the Chinese patent with application number 200410026780.3 uses steel fiber reinforced latex emulsion to modify concrete to prepare polymer modified concrete, and the Chinese patent with application number 201510193950.5 uses waterborne polyurethane as polymer modified concrete to prepare polymer modified concrete; the Chinese patent with application number 201910333153.0 uses styrene acrylic emulsion as polymer modifier to prepare polymer modified concrete surface protection material. However, most of the polymer modified concretes currently prepared have problems such as uneven distribution of polymer and aggregate, poor durability, etc., and are prone to poor impermeability and cracking in practical applications; on the other hand, their use strength is also insufficient, and their application in some special fields is limited. In order to expand the application range of polymer modified concrete, the polymer modified concrete prepared in the present invention is mainly suitable for concrete projects such as bridge deck projects, tunnels, ports, highways, etc. that require high impermeability and durability. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for preparing a polymer modified concrete material, thereby improving the strength, impermeability and durability of concrete and solving the problem that bridge deck engineering or road engineering is easily damaged by corrosion in complex environments.

[0004] To achieve the above object, the technical solution adopted by the present invention is as follows: A method for preparing a polymer modified concrete material comprises the following steps: (1) adding silicon micropowder to polyoxyethylene alkyl ether ester and water, shearing and emulsifying for 60 to 90 minutes, and then spray drying to obtain modified silicon micropowder; (2) Firstly, the surfactant is completely dissolved in water, then the silicone resin is added, shear emulsified for 20 to 30 minutes, and then homogenized under a pressure of 20 to 60 MPa to obtain a polysiloxane emulsion; Wherein, by weight: 1 to 10 parts of surfactant, 60 to 80 parts of water, 50 to 60 parts of silicone resin; Then add the polysiloxane emulsion into the reactor and heat it to 40-60°C, add ethyl orthosilicate and ethylene glycol butyl ester, keep warm for 1 hour, slowly drop the polyacrylate emulsion, raise the temperature to 60-80°C after the addition, keep warm for 1-2 hours, add polyoxyethylene alkyl ether ester, emulsify for 20-30 minutes, cool to room temperature, filter, and obtain a polysiloxane / acrylate blended emulsion; Among them, by weight: 60-80 parts of polysiloxane emulsion, 1-5 parts of ethyl orthosilicate, 2-5 parts of ethylene glycol butyl ester, 50-80 parts of polyacrylate emulsion, 1-2 parts of polyoxyethylene alkyl ether ester; (3) At room temperature, add modified silica powder and rubber powder to the polysiloxane / acrylate blend emulsion, quickly stir and disperse for 30 to 45 minutes, then add the pre-mixed dry gravel, ordinary Portland cement and medium sand, stir evenly, and obtain a polymer modified concrete material.

[0005] In a preferred example, in step (1), the raw materials are calculated by weight: 100 parts of silicon micropowder, 1 to 5 parts of polyoxyethylene alkyl ether ester, and 50 to 100 parts of water.

[0006] In a preferred example, in step (2), the surfactant is a mixture of polyethylene polyamine salt and polyoxyethylene alkyl ether ester, wherein the weight ratio of polyethylene polyamine salt to polyoxyethylene alkyl ether ester is 1:2.

[0007] In a preferred example, in step (2), the silicone resin is selected from one of hydroxymethyl silicone resin, hydroxyphenyl silicone resin and amino silicone resin.

[0008] In a preferred example, in step (2), the solid content of the polyacrylate emulsion is 40-45%.

[0009] In a preferred example, in step (2), the rubber powder is a mixture of cellulose and redispersible latex powder, wherein the weight ratio of cellulose to redispersible latex powder is 1 to 5:1; Wherein, the cellulose is selected from one of hydroxypropyl methylcellulose, carboxymethyl cellulose and hydroxyethyl cellulose.

[0010] In a preferred example, in step (3), the raw materials are calculated by weight as follows: 17-20 parts of modified silica powder, 2-5 parts of rubber powder, 10-20 parts of polysiloxane / acrylate blend emulsion, 25-28 parts of dry gravel, 14-16 parts of ordinary Portland cement, and 25-30 parts of medium sand.

[0011] Based on a general inventive concept, another object of the present invention is to provide a polymer modified concrete material prepared by the above preparation method.

[0012] Compared with the prior art, the advantages and positive effects of the present invention are as follows: 1. Using polysiloxane / acrylate blended emulsion as a polymer modifier, a colloid can be formed at the interface of the slurry and the aggregate, enhancing the bonding force between the aggregate and the slurry. At the same time, a network structure is formed inside the slurry and the aggregate; using modified silica powder as a reinforcing agent, the surface of the silica powder has a chemical group with affinity for the organic system, which increases the amount of modified silica powder added, improves the processing technology, and has better binding properties with the emulsion system. Therefore, the compressive, flexural and tensile strength of the polymer modified concrete are greatly improved. The 28-day compressive strength of the polymer modified concrete prepared by the present invention is 30-40MPa, the tensile strength is 2-3MPa, the flexural strength is 3-5MPa, and the elastic modulus is 3×10 4 ~4×10 4 MPa.

[0013] 2. Using polysiloxane / acrylate blended emulsion as a polymer modifier, the film easily formed inside the concrete material has good water resistance and can effectively prevent the entry of corrosive media. The formed film is flexible, which improves its crack resistance, reduces the formation of microcrack grids, prevents the transmission of moisture, and protects the steel bars from rust. The maximum water pressure of the anti-seepage can reach 1.4MPa. Compared with cement concrete prepared by traditional methods, it has the remarkable characteristics of high strength and good durability, as well as excellent anti-seepage and anti-freeze properties. It can be widely used in concrete projects such as bridge deck projects, tunnels, ports, and highways. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in conjunction with specific embodiments, but the present invention is not limited to these embodiments. It should be noted that, under the premise of no conflict, the embodiments described below or the technical features can be arbitrarily combined to form new embodiments. In the present invention, unless otherwise specified, the equipment and raw materials used can be purchased from the market or are commonly used in the art. The methods in the following embodiments, if not otherwise specified, are conventional methods in the art.

[0015] As used herein, the terms "comprises," "including," "contains," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0016] When the amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range limited by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether this range is disclosed separately. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including ranges "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5" etc. When a numerical range is described in this article, unless otherwise stated, this range is intended to include its end values ​​and all integers and fractions within this range. Example

[0017] A method for preparing a polymer modified concrete material comprises the following steps: (1) adding silicon micropowder to polyoxyethylene alkyl ether ester and water, shearing and emulsifying for 90 minutes, and then spray drying to obtain modified silicon micropowder; Among them, the raw materials are calculated by weight: 100 parts of silicon micropowder, 5 parts of polyoxyethylene alkyl ether ester, and 100 parts of water; (2) First, the surfactant is completely dissolved in water, then the amino silicone resin is added, sheared and emulsified for 30 minutes, and then homogenized under a pressure of 20 MPa to obtain a polysiloxane emulsion; By weight: 9 parts of surfactant, 80 parts of water, 60 parts of amino silicone resin; The surfactant is a mixture of polyethylene polyamine salt and polyoxyethylene alkyl ether ester, wherein the weight ratio of the polyethylene polyamine salt to the polyoxyethylene alkyl ether ester is 1:2; Then, the polysiloxane emulsion is added into the reactor and heated to 60°C, and ethyl orthosilicate and ethylene glycol butyl ester are added. After keeping the temperature for 1 hour, the polyacrylate emulsion is slowly added dropwise. After the addition is completed, the temperature is increased to 80°C, and the temperature is kept for reaction for 2 hours. Polyoxyethylene alkyl ether is added, and the mixture is emulsified for 30 minutes. The mixture is cooled to room temperature and filtered to obtain a polysiloxane / acrylate blended emulsion. By weight: 80 parts of polysiloxane emulsion, 5 parts of tetraethyl orthosilicate, 5 parts of ethylene glycol butyl ester, 80 parts of polyacrylate emulsion with a solid content of 45%, and 2 parts of polyoxyethylene alkyl ether ester; (3) At room temperature, the modified silica powder and rubber powder are added to the polysiloxane / acrylate blend emulsion, and the mixture is rapidly stirred and dispersed for 40 minutes. Then, the pre-mixed dry gravel, ordinary Portland cement and medium sand are added, and the mixture is stirred evenly to obtain a polymer modified concrete material. Among them, the raw materials are calculated by weight: 20 parts of modified silica powder, 4 parts of rubber powder, 20 parts of polysiloxane / acrylate blended emulsion, 28 parts of dry stone, 16 parts of ordinary Portland cement, and 30 parts of medium sand; The rubber powder is a mixture of hydroxypropyl methylcellulose and redispersible latex powder, wherein the weight ratio of the hydroxypropyl methylcellulose to the redispersible latex powder is 3:1.

[0018] The concrete material prepared in this embodiment was tested according to the standard method of GB / T 50081-2019 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete": the compressive strength after 28 days was 38.1 MPa, the tensile strength was 2.86 MPa, the flexural strength was 4.6 MPa, and the elastic modulus was 3.54×10 4 MPa, the maximum water pressure for anti-seepage is 1.3MPa. Example

[0019] A method for preparing a polymer modified concrete material comprises the following steps: (1) adding silicon micropowder to polyoxyethylene alkyl ether ester and water, shearing and emulsifying for 90 minutes, and then spray drying to obtain modified silicon micropowder; Among them, the raw materials are calculated by weight: 100 parts of silicon micropowder, 1 part of polyoxyethylene alkyl ether ester, and 50 parts of water; (2) First, the surfactant is completely dissolved in water, and then the hydroxyphenyl silicone resin is added, sheared and emulsified for 20 minutes, and then homogenized at a pressure of 60 MPa to obtain a polysiloxane emulsion; By weight: 3 parts of surfactant, 60 parts of water, 50 parts of hydroxyphenyl silicone resin; The surfactant is a mixture of polyethylene polyamine salt and polyoxyethylene alkyl ether ester, wherein the weight ratio of the polyethylene polyamine salt to the polyoxyethylene alkyl ether ester is 1:2; Then, the polysiloxane emulsion is added into the reactor and heated to 40°C, and ethyl orthosilicate and ethylene glycol butyl ester are added. After keeping the temperature for 1 hour, the polyacrylate emulsion is slowly added dropwise. After the addition is completed, the temperature is increased to 60°C, and the temperature is kept for reaction for 1 hour. Polyoxyethylene alkyl ether is added, and the mixture is emulsified for 20 minutes. The mixture is cooled to room temperature and filtered to obtain a polysiloxane / acrylate blended emulsion. By weight: 60 parts of polysiloxane emulsion, 1 part of tetraethyl orthosilicate, 2 parts of ethylene glycol butyl ester, 50 parts of polyacrylate emulsion with a solid content of 40%, and 1 part of polyoxyethylene alkyl ether ester; (3) At room temperature, the modified silica powder and rubber powder are added to the polysiloxane / acrylate blend emulsion, and the mixture is rapidly stirred and dispersed for 30 minutes. Then, the pre-mixed dry gravel, ordinary Portland cement and medium sand are added, and the mixture is stirred evenly to obtain a polymer modified concrete material. Among them, the raw materials are calculated by weight: 17 parts of modified silica powder, 2 parts of rubber powder, 10 parts of polysiloxane / acrylate blended emulsion, 25 parts of dry stone, 14 parts of ordinary Portland cement, and 25 parts of medium sand; The rubber powder is a mixture of carboxymethyl cellulose and redispersible latex powder, wherein the weight ratio of the carboxymethyl cellulose to the redispersible latex powder is 1:1.

[0020] The concrete material prepared in this embodiment was tested according to the standard method of GB / T 50081-2019 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete": the compressive strength after 28 days was 37.5 MPa, the tensile strength was 2.75 MPa, the flexural strength was 4.2 MPa, and the elastic modulus was 3.41×10 4 MPa, the maximum water pressure for anti-seepage is 1.2MPa. Example

[0021] A method for preparing a polymer modified concrete material comprises the following steps: (1) adding silicon micropowder to polyoxyethylene alkyl ether ester and water, shearing and emulsifying for 90 minutes, and then spray drying to obtain modified silicon micropowder; Among them, the raw materials are calculated by weight: 100 parts of silicon micropowder, 5 parts of polyoxyethylene alkyl ether ester, and 100 parts of water; (2) First, the surfactant is completely dissolved in water, and then the hydroxymethyl silicone resin is added, sheared and emulsified for 30 minutes, and then homogenized at a pressure of 40 MPa to obtain a polysiloxane emulsion; By weight: 6 parts of surfactant, 60 parts of water, 60 parts of hydroxymethyl silicone resin; The surfactant is a mixture of polyethylene polyamine salt and polyoxyethylene alkyl ether ester, wherein the weight ratio of the polyethylene polyamine salt to the polyoxyethylene alkyl ether ester is 1:2; Then, the polysiloxane emulsion is added into the reactor and heated to 50°C, and ethyl orthosilicate and ethylene glycol butyl ester are added. After keeping the temperature for 1 hour, the polyacrylate emulsion is slowly added dropwise. After the addition is completed, the temperature is increased to 75°C, and the temperature is kept for reaction for 2 hours. Polyoxyethylene alkyl ether is added, and the mixture is emulsified for 30 minutes. The mixture is cooled to room temperature and filtered to obtain a polysiloxane / acrylate blended emulsion. By weight: 80 parts of polysiloxane emulsion, 3 parts of tetraethyl orthosilicate, 4 parts of ethylene glycol butyl ester, 75 parts of polyacrylate emulsion with a solid content of 42%, and 1 part of polyoxyethylene alkyl ether ester; (3) At room temperature, the modified silica powder and rubber powder are added to the polysiloxane / acrylate blend emulsion, and the mixture is rapidly stirred and dispersed for 40 minutes. Then, the pre-mixed dry gravel, ordinary Portland cement and medium sand are added, and the mixture is stirred evenly to obtain a polymer modified concrete material. Among them, the raw materials are calculated by weight: 18 parts of modified silica powder, 5 parts of rubber powder, 16 parts of polysiloxane / acrylate blended emulsion, 27 parts of dry stone, 15 parts of ordinary Portland cement, and 26 parts of medium sand; The rubber powder is a mixture of hydroxyethyl cellulose and redispersible latex powder, wherein the weight ratio of the hydroxyethyl cellulose to the redispersible latex powder is 4:1.

[0022] The concrete material prepared in this embodiment was tested according to the standard method of GB / T 50081-2019 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete": the compressive strength after 28 days was 39.6 MPa, the tensile strength was 2.95 MPa, the flexural strength was 4.8 MPa, and the elastic modulus was 3.56×10 4 MPa, the maximum water pressure for anti-seepage is 1.4MPa.

[0023] A polymer modified concrete material, the preparation process is as follows: (1) adding silicon micropowder to polyoxyethylene alkyl ether ester and water, shearing and emulsifying for 90 minutes, and then spray drying to obtain modified silicon micropowder; Among them, the raw materials are calculated by weight: 100 parts of silicon micropowder, 5 parts of polyoxyethylene alkyl ether ester, and 100 parts of water; (2) At room temperature, the modified silica powder and rubber powder are added to the polyacrylate emulsion, and the mixture is rapidly stirred and dispersed for 40 minutes. Then, the pre-mixed dry gravel, ordinary Portland cement and medium sand are added and stirred to obtain a polymer modified concrete material. Among them, the raw materials are calculated by weight: 18 parts of modified silica powder, 5 parts of rubber powder, 16 parts of polyacrylate emulsion, 27 parts of dry stone, 15 parts of ordinary Portland cement, and 26 parts of medium sand; The rubber powder is a mixture of hydroxyethyl cellulose and redispersible latex powder, wherein the weight ratio of the hydroxyethyl cellulose to the redispersible latex powder is 4:1.

[0024] The concrete material prepared in this comparative example was tested according to the standard method of GB / T 50081-2019 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete": the compressive strength after 28 days was 31.1 MPa, the tensile strength was 2.25 MPa, the flexural strength was 3.2 MPa, and the elastic modulus was 2.86×10 4 MPa, the maximum water pressure for anti-seepage is 1.0MPa.

[0025] A polymer modified concrete material, the preparation process is as follows: (1) First, the surfactant is completely dissolved in water, and then the hydroxymethyl silicone resin is added, sheared and emulsified for 30 minutes, and then homogenized at a pressure of 40 MPa to obtain a polysiloxane emulsion; By weight: 6 parts of surfactant, 60 parts of water, 60 parts of hydroxymethyl silicone resin; The surfactant is a mixture of polyethylene polyamine salt and polyoxyethylene alkyl ether ester, wherein the weight ratio of the polyethylene polyamine salt to the polyoxyethylene alkyl ether ester is 1:2; Then, the polysiloxane emulsion is added into the reactor and heated to 50°C, and ethyl orthosilicate and ethylene glycol butyl ester are added. After keeping the temperature for 1 hour, the polyacrylate emulsion is slowly added dropwise. After the addition is completed, the temperature is increased to 75°C, and the temperature is kept for reaction for 2 hours. Polyoxyethylene alkyl ether is added, and the mixture is emulsified for 30 minutes. The mixture is cooled to room temperature and filtered to obtain a polysiloxane / acrylate blended emulsion. By weight: 80 parts of polysiloxane emulsion, 3 parts of tetraethyl orthosilicate, 4 parts of ethylene glycol butyl ester, 75 parts of polyacrylate emulsion with a solid content of 42%, and 1 part of polyoxyethylene alkyl ether ester; (2) At room temperature, adding silica powder and rubber powder to the polysiloxane / acrylate blended emulsion, rapidly stirring and dispersing for 40 minutes, then adding the pre-mixed dry gravel, ordinary Portland cement and medium sand, stirring evenly, to obtain a polymer modified concrete material; Among them, the raw materials are calculated by weight: 18 parts of silicon micropowder, 5 parts of rubber powder, 16 parts of polysiloxane / acrylate blended emulsion, 27 parts of dry stone, 15 parts of ordinary Portland cement, and 26 parts of medium sand; The rubber powder is a mixture of hydroxyethyl cellulose and redispersible latex powder, wherein the weight ratio of the hydroxyethyl cellulose to the redispersible latex powder is 4:1.

[0026] The concrete material prepared in this comparative example was tested according to the standard method of GB / T 50081-2019 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete": the compressive strength after 28 days was 32.6 MPa, the tensile strength was 2.35 MPa, the flexural strength was 3.0 MPa, and the elastic modulus was 2.96×10 4 MPa, the maximum water pressure for anti-seepage is 1.1MPa.

[0027] A polymer modified concrete material, the preparation process is as follows: (1) The surfactant is completely dissolved in water, and then a hydroxymethyl silicone resin is added, and shear emulsification is performed for 30 minutes, and then homogenization is performed under a pressure of 40 MPa to obtain a polysiloxane emulsion; By weight: 6 parts of surfactant, 60 parts of water, 60 parts of hydroxymethyl silicone resin; The surfactant is a mixture of polyethylene polyamine salt and polyoxyethylene alkyl ether ester, wherein the weight ratio of the polyethylene polyamine salt to the polyoxyethylene alkyl ether ester is 1:2; (2) At room temperature, add silica powder and rubber powder to polysiloxane emulsion, quickly stir and disperse for 40 minutes, then add pre-mixed dry gravel, ordinary Portland cement and medium sand, stir evenly, and obtain polymer modified concrete material; Among them, the raw materials are calculated by weight: 18 parts of silicon micropowder, 5 parts of rubber powder, 16 parts of polysiloxane emulsion, 27 parts of dry stone, 15 parts of ordinary Portland cement, and 26 parts of medium sand; The rubber powder is a mixture of hydroxyethyl cellulose and redispersible latex powder, wherein the weight ratio of the hydroxyethyl cellulose to the redispersible latex powder is 4:1.

[0028] The concrete material prepared in this comparative example was tested according to the standard method of GB / T 50081-2019 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete": the compressive strength after 28 days was 30.2 MPa, the tensile strength was 2.45 MPa, the flexural strength was 3.5 MPa, and the elastic modulus was 3.09×10 4 MPa, the maximum water pressure for anti-seepage is 1.2MPa.

[0029] It can be seen from the above test results that the polymer modified concrete material prepared by the process method of the present invention has significantly higher 28-day compressive strength, tensile strength, flexural strength, elastic modulus, and maximum water pressure resistance than the existing conventional technology, which can better expand the application field of polymer modified concrete materials and is widely used in concrete projects such as bridge deck projects, tunnels, ports, and highways.

[0030] The above embodiments are merely preferred implementations of the present invention. Any simple modification, amendment and substitution of the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a polymer modified concrete material, characterized in that: The following steps are involved: (1) adding silicon micropowder to polyoxyethylene alkyl ether ester and water, shearing and emulsifying for 60 to 90 minutes, and then spray drying to obtain modified silicon micropowder; (2) Firstly, the surfactant is completely dissolved in water, then the silicone resin is added, shear emulsified for 20 to 30 minutes, and then homogenized under a pressure of 20 to 60 MPa to obtain a polysiloxane emulsion; Wherein, by weight: 1 to 10 parts of surfactant, 60 to 80 parts of water, 50 to 60 parts of silicone resin; Then add the polysiloxane emulsion into the reactor and heat it to 40-60°C, add ethyl orthosilicate and ethylene glycol butyl ester, keep warm for 1 hour, slowly drop the polyacrylate emulsion, raise the temperature to 60-80°C after the addition, keep warm for 1-2 hours, add polyoxyethylene alkyl ether ester, emulsify for 20-30 minutes, cool to room temperature, filter, and obtain a polysiloxane / acrylate blended emulsion; Among them, by weight: 60-80 parts of polysiloxane emulsion, 1-5 parts of ethyl orthosilicate, 2-5 parts of ethylene glycol butyl ester, 50-80 parts of polyacrylate emulsion, 1-2 parts of polyoxyethylene alkyl ether ester; (3) At room temperature, add modified silica powder and rubber powder to the polysiloxane / acrylate blend emulsion, quickly stir and disperse for 30 to 45 minutes, then add the pre-mixed dry gravel, ordinary Portland cement and medium sand, stir evenly, and obtain a polymer modified concrete material.

2. The method for preparing a polymer modified concrete material according to claim 1, characterized in that: Step (1), the raw materials are calculated by weight: 100 parts of silicon micropowder, 1-5 parts of polyoxyethylene alkyl ether ester, and 50-100 parts of water.

3. The method for preparing a polymer modified concrete material according to claim 1, characterized in that: In step (2), the surfactant is a mixture of polyethylene polyamine salt and polyoxyethylene alkyl ether ester, wherein the weight ratio of the polyethylene polyamine salt to the polyoxyethylene alkyl ether ester is 1:

2.

4. The method for preparing a polymer modified concrete material according to claim 1, characterized in that: In step (2), the silicone resin is selected from one of hydroxymethyl silicone resin, hydroxyphenyl silicone resin and amino silicone resin.

5. The method for preparing a polymer modified concrete material according to claim 1, characterized in that: In step (2), the solid content of the polyacrylate emulsion is 40-45%.

6. The method for preparing a polymer modified concrete material according to claim 1, characterized in that: Step (2), the rubber powder is a mixture of cellulose and redispersible latex powder, and the weight ratio of the rubber powder to the redispersible latex powder is 1 to 5:1; Wherein, the cellulose is selected from one of hydroxypropyl methylcellulose, carboxymethyl cellulose and hydroxyethyl cellulose.

7. The method for preparing a polymer modified concrete material according to claim 1, characterized in that: Step (3), the raw materials are calculated by weight: 17-20 parts of modified silica powder, 2-5 parts of rubber powder, 10-20 parts of polysiloxane / acrylate blend emulsion, 25-28 parts of dry gravel, 14-16 parts of ordinary Portland cement, and 25-30 parts of medium sand.

8. A polymer modified concrete material prepared by the preparation method according to any one of claims 1 to 7.