阅读说明：本技术 一种装配式混凝土双组份表面增强剂及其使用方法 (Assembled concrete two-component surface reinforcing agent and use method thereof ) 是由 顾越 夏锴伦 靳卫准 蒋林华 郭明志 吕凯 于 2020-07-31 设计创作，主要内容包括：本发明公开了一种装配式混凝土双组份表面增强剂及其使用方法,该表面增强剂包括组分A和组分B,组分A包括乙二胺四乙酸四钠5～25份、柠檬酸纳1～10份、三乙醇胺0.5～3份、葡萄糖酸钠1～10份、葡庚糖酸钠1～10份、水100～500份,组分B包括纳米二氧化硅5～20份、聚丙烯酸改性纳米二氧化硅5～20份、聚羧酸改性纳米二氧化硅10～30份、水100～300份,使用方法包括以下步骤：(1)对待加强的混凝土表面区域预处理；(2)将组分A涂刷或喷涂在混凝土表面3～5次,每次间隔时间为15～30min,静置2～6h；(3)将组分B涂刷或喷涂在涂有组分A的混凝土表面,并湿润养护24～48h。该增强剂的反应成分能够适应不同的孔隙特征及孔界面特性,有效提高混凝土表面性能,其寿命得到延长,成分为水溶性,绿色环保。(The invention discloses an assembled concrete two-component surface reinforcing agent and a using method thereof, the surface reinforcing agent comprises a component A and a component B, the component A comprises 5-25 parts of ethylene diamine tetraacetic acid tetrasodium, 1-10 parts of sodium citrate, 0.5-3 parts of triethanolamine, 1-10 parts of sodium gluconate, 1-10 parts of sodium glucoheptonate and 100-500 parts of water, and the component B comprises 5-20 parts of nano silicon dioxide, 5-20 parts of polyacrylic acid modified nano silicon dioxide, 10-30 parts of polycarboxylic acid modified nano silicon dioxide and 100-300 parts of water, and the using method comprises the following steps: (1) pretreating the surface area of the concrete to be reinforced; (2) coating or spraying the component A on the surface of concrete for 3-5 times, wherein the interval time is 15-30 min each time, and standing for 2-6 h; (3) and (3) coating or spraying the component B on the surface of the concrete coated with the component A, and wetting and curing for 24-48 h. The reaction components of the reinforcing agent can adapt to different pore characteristics and pore interface characteristics, the surface performance of concrete is effectively improved, the service life of the concrete is prolonged, and the reinforcing agent is water-soluble and environment-friendly.)

1. The assembled concrete two-component surface reinforcing agent is characterized by comprising a component A and a component B, wherein the component A comprises, by mass, 5-25 parts of ethylene diamine tetraacetic acid tetrasodium salt, 1-10 parts of sodium citrate, 0.5-3 parts of triethanolamine, 1-10 parts of sodium gluconate, 1-10 parts of sodium glucoheptonate and 100-500 parts of water, and the component B comprises 5-20 parts of nano silicon dioxide, 5-20 parts of polyacrylic acid modified nano silicon dioxide, 10-30 parts of polycarboxylic acid modified nano silicon dioxide and 100-300 parts of water.

2. The fabricated concrete two-component surface enhancer of claim 1, wherein the nanosilica particle size is less than 30 nm.

3. The fabricated concrete two-component surface reinforcing agent according to claim 1, wherein the particle size of the polyacrylic acid modified nano silicon dioxide is 30-100 nm.

4. The fabricated concrete two-component surface enhancer of claim 1 or 3, wherein the polyacrylic acid modified nano silica is prepared by the following steps:

(1) adding 30-100 parts of acrylic acid, 1-6 parts of gamma-mercaptopropyl-trimethoxysilane and 1-5 parts of benzophenone into a reaction vessel, introducing nitrogen for protection, and stirring at a constant temperature of 20-30 ℃;

(2) keeping the stirring state, and irradiating for 5-30 minutes by using an ultraviolet lamp;

(3) dissolving the obtained product with tetrahydrofuran, centrifugally precipitating, and drying in vacuum at 40-60 ℃ to obtain silane modified polyacrylic acid;

(4) adding 0.1-2 parts of silane modified polyacrylic acid into 100-120 parts of nano silicon dioxide aqueous solution, heating to 40-60 ℃, keeping stirring and keeping the temperature for 1-3 hours, cooling to room temperature, and washing and precipitating to obtain polyacrylic acid modified nano silicon dioxide.

5. The fabricated concrete two-component surface enhancer of claim 4, wherein the ultraviolet lamp wavelength in step 2 is 365 nm.

6. The fabricated concrete two-component surface enhancer as claimed in claim 1, wherein the particle size of the polycarboxylic acid modified nano silica is 20-80 nm.

7. The fabricated concrete two-component surface enhancer of claim 1 or 6, wherein the polycarboxylic acid modified nano-silica is prepared by the following steps:

(1) adding 100-200 parts of polyether aqueous solution, 1-15 parts of vinyl triethoxysilane and 1-20 parts of hydrogen peroxide aqueous solution into a reaction container, keeping stirring and heating to 40-60 ℃ to obtain solution A;

(2) preparing 5-20 parts of methacrylic acid, 0.1-1 part of vitamin C, 0.1-1 part of beta-mercaptopropionic acid and 150-300 parts of water into a solution B;

(3) adding the solution B into the solution A, keeping stirring, heating to 40-60 ℃, preserving heat for 1-2 hours at the temperature of 40-60 ℃, cooling to room temperature, and adjusting the solid content of the solution to 20% -25% to prepare a solution C;

(4) adding 100-120 parts of nano-silica aqueous solution into a reaction container, keeping stirring, heating to 50-80 ℃, adding 10-20 parts of solution C, preserving heat for 1-2 hours, cooling the reaction solution to room temperature, washing and precipitating to obtain polycarboxylic acid modified nano-silica.

8. The fabricated concrete two-component surface reinforcing agent according to claim 7, wherein the time for adding the solution B into the solution A in the step 3 is 1-2 hours, and the time for adding the solution C into the nano-silica aqueous solution in the step 4 is 1-2 hours.

9. The fabricated concrete two-component surface enhancer as claimed in claim 7, wherein the unreacted materials are removed by dialysis after the reaction solution in the step 4 is cooled to room temperature.

10. The use method of the fabricated concrete two-component surface reinforcing agent according to claim 1, characterized by comprising the following steps:

(1) pretreating the surface area of the concrete to be reinforced;

(2) coating or spraying the component A on the surface of concrete for 3-5 times, wherein the interval time is 15-30 min each time, and standing for 2-6 h;

(3) and (3) coating or spraying the component B on the surface of the concrete coated with the component A, and wetting and curing for 24-48 h.

Technical Field

The invention relates to a reinforcing agent and a using method thereof, in particular to an assembled concrete two-component surface reinforcing agent and a using method thereof.

Background

The concrete structure formed by assembling or connecting the prefabricated components serving as main stressed components is an assembled concrete structure, the production efficiency is high, the requirements of land saving, energy saving, material saving and water saving are met, external force can be borne by the prefabricated assembled concrete components when the prefabricated assembled concrete components are transported to a site and assembled or bearing at the site, and meanwhile, the prefabricated assembled concrete components face complex and variable external environments in service and can influence the surface of the assembled concrete components, so that the surface strength is reduced, the pores are enlarged, and the service life of the prefabricated concrete components is shortened. The surface treatment technology can improve the surface performance of concrete, and the existing surface treatment agent can be divided into inorganic, organic and inorganic-organic composite according to main components. The organic treating agent has great advantages in improving waterproof performance, but has great difference with concrete matrix physical performance, poor self durability, especially poor ultraviolet resistance, and in addition, organic solvents and part of carcinogenic organic matters thereof easily cause health and environmental protection problems; the inorganic treating agent has earlier application, better durability and integration with a matrix compared with organic treating agents, and has the defects of poorer permeability, poorer toughness of a reaction product, and easy initiation of microcracks under external disturbance to lose protective performance; the components of organic-inorganic composite products taking inorganic components as main bodies are complex, the simple composite products easily cause that each active component can not be effectively and coordinately exerted, meanwhile, the products aiming at the fabricated concrete are fewer, and the requirements of engineering designers and users can not be met, so that the actual application requirements can not be met.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to provide a non-toxic and environment-friendly fabricated concrete two-component surface reinforcing agent which can effectively optimize the surface performance of a concrete matrix and improve the durability of the concrete matrix, and the invention also aims to provide a using method of the fabricated concrete two-component surface reinforcing agent.

The technical scheme is as follows: the assembled concrete two-component surface reinforcing agent comprises a component A and a component B, wherein the component A comprises 5-25 parts by mass of ethylene diamine tetraacetic acid tetrasodium, 1-10 parts by mass of sodium citrate, 0.5-3 parts by mass of triethanolamine, 1-10 parts by mass of sodium gluconate, 1-10 parts by mass of sodium glucoheptonate and 100-500 parts by mass of water, and the component B comprises 5-20 parts by mass of nano silicon dioxide, 5-20 parts by mass of polyacrylic acid modified nano silicon dioxide, 10-30 parts by mass of polycarboxylic acid modified nano silicon dioxide and 100-300 parts by mass of water.

Wherein the particle size of the nano silicon dioxide is less than 30nm, the particle size of the polyacrylic acid modified nano silicon dioxide is 30-100 nm, and the polyacrylic acid modified nano silicon dioxide is prepared by the following steps:

(1) adding 30-100 parts of acrylic acid, 1-6 parts of gamma-mercaptopropyl-trimethoxysilane and 1-5 parts of benzophenone into a reaction vessel, introducing nitrogen for protection, and stirring at a constant temperature of 20-30 ℃;

(2) keeping the stirring state, and irradiating for 5-30 minutes by using an ultraviolet lamp;

(3) dissolving the obtained product with tetrahydrofuran, centrifugally precipitating, and drying in vacuum at 40-60 ℃ to obtain silane modified polyacrylic acid;

(4) adding 0.1-2 parts of silane modified polyacrylic acid into 100-120 parts of nano silicon dioxide aqueous solution, heating to 40-60 ℃, keeping stirring and keeping the temperature for 1-3 hours, cooling to room temperature, and washing and precipitating to obtain polyacrylic acid modified nano silicon dioxide.

Wherein the wavelength of the ultraviolet lamp in the step 2 is 365 nm.

Wherein the particle size of the polycarboxylic acid modified nano-silica is 20-80 nm, and the polycarboxylic acid modified nano-silica is prepared by the following steps:

(1) adding 100-200 parts of polyether aqueous solution, 1-15 parts of vinyl triethoxysilane and 1-20 parts of hydrogen peroxide aqueous solution into a reaction container, keeping stirring and heating to 40-60 ℃ to obtain solution A;

(2) preparing 5-20 parts of methacrylic acid, 0.1-1 part of vitamin C, 0.1-1 part of beta-mercaptopropionic acid and 150-300 parts of water into a solution B;

(3) adding the solution B into the solution A, keeping stirring, heating to 40-60 ℃, preserving heat for 1-2 hours at the temperature of 40-60 ℃, cooling to room temperature, and adjusting the solid content of the solution to 20% -25% to prepare a solution C;

(4) adding 100-120 parts of nano-silica aqueous solution into a reaction container, keeping stirring, heating to 50-80 ℃, adding 10-20 parts of solution C, preserving heat for 1-2 hours, cooling the reaction solution to room temperature, washing and precipitating to obtain polycarboxylic acid modified nano-silica.

And (3) adding the solution B into the solution A in the step (3) for 1-2 hours, adding the solution C into the nano silicon dioxide aqueous solution in the step (4) for 1-2 hours, cooling the reaction solution to room temperature, and removing unreacted substances by using a dialysis method.

The use method of the concrete surface reinforcing agent comprises the following steps:

(1) pretreating the surface area of the concrete to be reinforced;

(2) coating or spraying the component A on the surface of concrete for 3-5 times, wherein the interval time is 15-30 min each time, and standing for 2-6 h;

(3) and (3) coating or spraying the component B on the surface of the concrete coated with the component A, and wetting and curing for 24-48 h.

Has the advantages that: the component A is a precursor chelating agent solution and can permeate into the micro-structural pores of the concrete matrix to effectively chelate calcium ions, magnesium ions and the like in the pores of the concrete, so that a permeation channel is dredged, the reaction components of the component B are prevented from reacting prematurely in the channel to generate precipitates to block the permeation channel, the component B is a permeation reaction type nano mixed solution and is a reactive component of a product, different nano silica particles in the component have different surface properties and different reaction properties and permeation power, the nano silica particles mutually cooperate after entering the pores of the concrete matrix, different gradients are formed by regulating and controlling the proportion of the nano silica particles, and the reactivity and the permeability can be effectively balanced aiming at different surfaces of the concrete matrix, so that the surface of the concrete matrix is optimized. Meanwhile, the components of the product are water-soluble, green and environment-friendly, and environmental pollution caused by excessive use of organic solvents is avoided.

Detailed Description

For better understanding of the present invention, the present invention will be further illustrated with reference to the following examples, but the present invention is not limited to the following examples, and the raw materials of the present invention are commercially available.