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Method for improving durability of concrete product by using carbonized coating

A concrete product and durability technology, applied in the field of building materials, can solve the problems of low efficiency and low utilization rate of maintenance devices, and achieve significant environmental benefits, shorten carbonization time, and improve utilization and production efficiency

Pending Publication Date: 2021-09-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, it is necessary to provide a method for improving the durability of concrete products by using carbonized coatings, so as to solve the technical problems of low efficiency and low utilization rate of maintenance devices in the prior art for improving the durability of concrete products

Method used

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  • Method for improving durability of concrete product by using carbonized coating
  • Method for improving durability of concrete product by using carbonized coating
  • Method for improving durability of concrete product by using carbonized coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Mix 90 parts of converter steel slag powder, 10 parts of calcium hydroxide, 0.1 part of polyvinyl alcohol (PVA), 0.2 part of sodium carboxymethyl cellulose (CMC), 4 parts of water reducing agent and 34 parts of tap water and mix Evenly, the carbonized coating is obtained; wherein, the calcium hydroxide is chemically pure calcium hydroxide, the water reducing agent is a polycarboxylate superplasticizer with a solid content of 40%, and the water content in the water reducing agent is not included in the weight of water in the number of copies;

[0035] (2) Spray the above-mentioned carbonized paint on the concrete test block evenly by a spray gun, and the spray thickness is controlled at 0.8-1.2mm, and then the sprayed test block is at a temperature of 20±0.5°C and a relative humidity of 45±0.5% Let stand for 30 minutes in the environment of carbonization, and then put the test block in a carbonization bucket for carbonization to obtain a concrete test block coated wi...

Embodiment 2

[0037] (1) 100 parts of converter steel slag powder, 0.1 part of polyvinyl alcohol (PVA), 0.2 part of sodium carboxymethyl cellulose (CMC), 6 parts of water reducing agent and 28 parts of tap water are mixed and evenly mixed to obtain a carbonized coating; Wherein, the calcium hydroxide is chemically pure grade calcium hydroxide, the water reducing agent is a polycarboxylate superplasticizer with a solid content of 40%, and the water content in the water reducing agent is not counted in the parts by weight of water;

[0038](2) Scratch the above-mentioned carbonized coating on the concrete test block, the thickness of the scraping coating is controlled at 0.8-1.2mm, and then the scrape-coated test block is placed in an environment with a temperature of 20±0.5°C and a relative humidity of 45±0.5% Let stand for 30 minutes, and then place the test block in a carbonization bucket for carbonization to obtain a concrete test block coated with a carbonized coating. Among them, the am...

Embodiment 3

[0040] (1) 80 parts of converter steel slag powder, 20 parts of calcium hydroxide, 0.7 parts of polyvinyl alcohol (PVA), 1.3 parts of sodium carboxymethyl cellulose (CMC), 1 part of water reducing agent, and 45 parts of tap water are mixed and mixed well , to obtain a carbonized coating; wherein, the calcium hydroxide is chemically pure grade calcium hydroxide, the water reducing agent is a polycarboxylate superplasticizer with a solid content of 40%, and the water content in the water reducing agent is not included in the weight of water among the numbers

[0041] (2) Brush the above-mentioned carbonized paint on the concrete test block, the thickness of the brush coating is controlled at 0.8-1.2mm, and then the brushed test block is at a temperature of 20±0.5°C and a relative humidity of 45±0.5% under the environment After standing for 120 minutes, the test block was placed in a carbonization bucket for carbonization to obtain a concrete test block coated with a carbonized c...

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Abstract

The invention discloses a method for improving durability of a concrete product by using a carbonized coating, which comprises the following steps: uniformly mixing 80-100 parts of a carbonized active cementing material, 0-20 parts of an auxiliary calcium source, 0.1-2.0 parts of a carbonized layer reinforcing agent, 1-6 parts of a water reducing agent and 25-45 parts of water to obtain a carbonized coating; and coating the carbonized coating on the surface of a product matrix, and standing and carbonizing to obtain the concrete product coated with the carbonized coating. By introducing the auxiliary calcium source, the carbonization time can be shortened, the utilization rate and the production efficiency of the carbonization device can be improved, and the requirements of a product production process are met; and by applying the carbonized coating prepared from the carbonized active cementing material such as the steel slag to the surface of the concrete product, the purpose of economically, conveniently and effectively improving the durability of the concrete product through the calcium carbonate coating is achieved, meanwhile, the application range of the carbonized active cementing material is widened, a large amount of carbon dioxide can be immobilized, and the method has obvious environmental benefits.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a method for improving the durability of concrete products by utilizing carbonized coating. Background technique [0002] Concrete products have good quality controllability and short production cycle, and have been widely used in prefabricated buildings and infrastructure construction such as bridges and tunnels. However, when concrete products are used in saline-alkali land, coastal areas and other areas with high sulfate and chloride content, they are easily eroded and then damaged, which greatly shortens their service time. Therefore, it is of great significance to improve the durability of concrete products. [0003] Generally, the effective methods for improving the erosion resistance of concrete products can be divided into two categories: (1) improving the erosion resistance of concrete materials; (2) surface coating treatment of concrete products. Surface coa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/08C04B40/02C04B41/65
CPCC04B28/082C04B40/0231C04B41/65C04B41/5083C04B2111/00508C04B22/064C04B24/2623C04B24/383C04B2103/302C04B41/4869C04B41/4803C04B41/5072C04B41/4539C04B41/4543
Inventor 何永佳邓皋吕林女刘志超王发洲胡曙光
Owner WUHAN UNIV OF TECH
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