Preparation process of concrete self-healing crystallization additive

Abstract

The invention discloses a preparation process of a concrete self-healing crystallization additive, and belongs to the technical field of building materials, and the preparation process comprises the following steps: respectively grinding 30-60 parts of refined silica powder and 20-40 parts of quartz sand, then adding 30-60 parts of refined silica powder and 20-40 parts of quartz sand into a mixing barrel in a dryer, then adding 8-20 parts of silicate, and drying for 3-5 minutes; then taking out the mixing barrel and putting into a mixing machine for mixing; sequentially adding 1-3 parts of an alkali metal salt compound into the mixture in the step 1 every 5-10 minutes, mixing for 5-10 minutes, and adding for 4 times in total; 2, 2-4 parts of a functional auxiliary agent is added into the mixture obtained in the step 2, mixing is conducted again for 10-15 min, standing is conducted for 50-80 min after mixing is completed, and the self-healing crystallization additive is obtained; according to the invention, the added silicate and alkali metal salt compound is dissolved in mixed concrete under the action of contacting with water and permeates in pores and microcracks of the concrete along with the water, so that the body impermeability and compactness of the concrete are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building materials, and particularly relates to a preparation process of a concrete self-healing crystallization additive. BACKGROUND

[0002] The concrete self-healing crystallization additive is a very promising technical field. The core active substance of mainstream crystalline additives (commonly known as crystalline penetration waterproof materials or cement-based penetration crystalline materials) is a special silicate compound, which aims to generate new crystalline substances by reacting with water, carbon dioxide or internal components of concrete to seal cracks.

[0003] The existing concrete self-healing crystallization additive has poor micro-pore plugging effect after being added during concrete mixing, which leads to poor water-blocking permeability of concrete under pressure, low crack filling efficiency due to high temperature or mechanical movement of concrete, and easy secondary damage of concrete.

[0004] In view of this, a concrete self-healing crystallization additive is developed to solve the above problems. SUMMARY

[0005] To solve the problems in the background art, the application provides a concrete self-healing crystallization additive, which has good micro-pore plugging effect and high repair efficiency.

[0006] To achieve the above purpose, the application provides the following technical scheme: a preparation process of a concrete self-healing crystallization additive, comprising the following steps: Step 1, take 30-60 parts of refined silicon powder and 20-40 parts of quartz sand and grind them respectively, then add 30-60 parts of refined silicon powder and 20-40 parts of quartz sand to the mixing barrel in the drying machine, then add 8-20 parts of silicate and dry for 3-5 minutes, then take out the mixing barrel and put it into the mixer for mixing; Step 2, add 1-3 parts of alkali metal salt compound to the mixture in step 1 every 5-10 minutes and mix for 5-10 minutes, a total of 4 times; Step 3, add 2-4 parts of functional additives to the mixture in step 2 and mix again, the mixing time is 10-15 minutes, and after mixing, the mixture is left to stand for 50-80 minutes to obtain the self-healing crystallization additive.

[0007] In the application, further; the refined silicon powder and quartz sand are ground by a high-energy ball mill, and the particle size after grinding is 1-5 microns.

[0008] In the application, further; the water content of the refined silicon powder, quartz sand and silicate after drying is less than 0.5%.

[0009] Further in the present application; the step 1 uses a conical mixer to mix.

[0010] Further in the present application; the silicate is one of lithium silicate or potassium silicate.

[0011] Further in the present application; the mixing temperature of the mixture in the step 2 is controlled at 15-25℃, and the humidity RH is less than 28%.

[0012] Further in the present application; the functional additives in the step 3 are one or several of polycarboxylic acid water reducing agent, cellulose ether, and penetrant.

[0013] Compared with the prior art, the present application has the beneficial effects that: 1、The silicate and alkali metal salt compound added in the present application dissolves and penetrates in the capillary pores and micro-cracks of the concrete under the action of water in the mixed concrete, which fundamentally improves the impermeability and compactness of the concrete, provides the static waterproof ability of the concrete, realizes the dynamic self-healing of the concrete, and improves the waterproofness, durability and service life of the concrete structure.

[0014] 2、The present application adds different types of functional additives to improve the flowability and dispersibility of the concrete self-healing crystalline additive during use, ensure the filling quality of the internal cracks of the concrete, and ensure the internal humidity of the concrete to maintain the crystalline additive reaction, continuously repair and fill the pores, and ensure the use quality. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0016] Embodiment 1 The preparation process of the concrete self-healing crystalline additive described above comprises the following steps: Step 1: 30 parts of refined silicon powder and 20 parts of quartz sand are respectively ground, then 30 parts of refined silicon powder and 20 parts of quartz sand are added to the mixing barrel in the dryer, 10 parts of silicate is further added and dried for 4 minutes, and then the mixing barrel is taken out and put into the mixer for mixing; Step 2: 1.5 parts of alkali metal salt compound is added to the mixture in step 1 every 8 minutes and mixed for 10 minutes, and the total adding time is 4 times; Step 3: Add 2 parts of functional additive to the mixture in Step 2 and mix again for 10 minutes. After mixing, let stand for 50 minutes to obtain the self-healing crystallizing additive.

[0017] Example 2 The preparation process of the above-mentioned self-healing crystallizing additive for concrete includes the following steps: Step 1: Take 40 parts of refined silicon micro powder and 25 parts of quartz sand and grind them separately. Then add 40 parts of refined silicon micro powder, 25 parts of quartz sand and 15 parts of silicate to the mixing bucket inside the dryer and dry for 5 minutes. Then take out the mixing bucket and put it into the mixer for mixing. Step 2: Add 2 parts of alkali metal salt complex to the mixture in Step 1 every 5 minutes and mix for 10 minutes, for a total of 4 additions; Step 3: Add 2.5 parts of functional additive to the mixture in Step 2 and mix again for 12 minutes. After mixing, let stand for 65 minutes to obtain the self-healing crystallizing additive.

[0018] Example 3 The preparation process of the above-mentioned self-healing crystallizing additive for concrete includes the following steps: Step 1: Take 50 parts of refined silicon micro powder and 35 parts of quartz sand and grind them separately. Then add 50 parts of refined silicon micro powder, 35 parts of quartz sand and 17 parts of silicate to the mixing bucket inside the dryer and dry for 5 minutes. Then take out the mixing bucket and put it into the mixer for mixing. Step 2: Add 3 parts of alkali metal salt complex to the mixture in Step 1 every 5 minutes and mix for 9 minutes, for a total of 4 additions; Step 3: Add 3.5 parts of functional additive to the mixture in Step 2 and mix again for 15 minutes. After mixing, let stand for 70 minutes to obtain the self-healing crystallizing additive.

[0019] Example 4 The preparation process of the above-mentioned self-healing crystallizing additive for concrete includes the following steps: Step 1: Take 60 parts of refined silicon micro powder and 25 parts of quartz sand and grind them separately. Then add 60 parts of refined silicon micro powder, 25 parts of quartz sand and 13 parts of silicate to the mixing bucket inside the dryer and dry for 5 minutes. Then take out the mixing bucket and put it into the mixer for mixing. Step 2: Add 3 parts of alkali metal salt complex to the mixture in Step 1 every 7 minutes and mix for 10 minutes, for a total of 4 additions; Step 3: Add 4 parts of functional additive to the mixture in Step 2 and mix again for 10 minutes. After mixing, let stand for 60 minutes to obtain the self-healing crystallizing additive.

[0020] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A preparation process for a self-healing crystallizing additive for concrete, characterized in that: Includes the following steps: Step 1: Take 30-60 parts of refined silicon micro powder and 20-40 parts of quartz sand and grind them separately. Then add 30-60 parts of refined silicon micro powder and 20-40 parts of quartz sand to the mixing bucket inside the dryer, add 8-20 parts of silicate and dry for 3-5 minutes. Then take out the mixing bucket and put it into the mixer for mixing. Step 2: Add 1-3 parts of alkali metal salt complex to the mixture in Step 1 every 5-10 minutes and mix for 5-10 minutes, for a total of 4 times; Step 3: Add 2-4 parts of functional additives to the mixture in Step 2 and mix again for 10-15 minutes. After mixing, let stand for 50-80 minutes to obtain the self-healing crystallizing additive.

2. The preparation process of a self-healing crystallizing additive for concrete according to claim 1, characterized in that: The refined silicon micro powder and quartz sand are ground using a high-energy ball mill, and the particle size after grinding is 1-5 micrometers.

3. The preparation process of a self-healing crystallizing additive for concrete according to claim 1, characterized in that: The moisture content of the refined silica powder, quartz sand, and silicate after drying is less than 0.5%.

4. The preparation process of a self-healing crystallizing additive for concrete according to claim 1, characterized in that: Step 1 involves mixing materials using a cone mixer.

5. The preparation process of a self-healing crystallizing additive for concrete according to claim 1, characterized in that: The silicate is either lithium silicate or potassium silicate.

6. The preparation process of a self-healing crystallizing additive for concrete according to claim 1, characterized in that: In step 2, the mixing temperature of the mixture is controlled between 15℃ and 25℃, and the humidity (RH) is less than 28%.

7. The preparation process of a self-healing crystallizing additive for concrete according to claim 1, characterized in that: In step 3, the functional additive is one or more of polycarboxylate superplasticizers, cellulose ethers, and penetrants.