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Fair-faced concrete surface defect repairing material and preparation method thereof

A technology for fair-faced concrete and defect repair, which is applied in the field of cement-based repair materials. It can solve problems such as difficult repairs, small cracks in color difference, etc., and achieve the effects of convenient material selection, increased cohesion, and improved initial fluidity

Pending Publication Date: 2022-04-12
陕西秦汉恒盛新型建材科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By adjusting the ratio of the cementitious material and adding black toner, the material has no color difference between the repair material and the fair-faced concrete. No coarse and fine aggregates are added, and the selected cementitious materials are all powders with small particle sizes. It is suitable for small cracks. Repair the surface defects of fair-faced concrete to solve the problems of color difference and small cracks that are not easy to repair when fair-faced concrete is repaired. At the same time, the expansion agent added makes the repaired cracks not shrink, which can effectively solve the cracks and honeycomb surface of fair-faced concrete. , mottled or coarse aggregate transparent layer and other appearance quality problems, to achieve repair materials with better bond strength and high wear resistance, to achieve no color difference with fair-faced concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The fair-faced concrete surface defect repair material of the present embodiment is made of the following components in parts by weight: 500 parts of Portland cement, 150 parts of limestone powder, 200 parts of mineral powder, 45 parts of silica fume, 10 parts of redispersible latex powder 18 parts of water reducer, 2 parts of cellulose ether, 50 parts of expansion agent, 3 parts of black toner, 1 part of defoamer;

[0033] The cellulose ether is hydroxypropyl methylcellulose ether with a viscosity of 70,000 to 100,000 mpa.s; the defoamer is a silicone defoamer; the Portland cement is ordinary Portland cement P·O 42.5, with an average particle size of 12 μm to 17 μm; the limestone powder has a water content of less than 1%, and an average particle size of 6 μm to 10 μm; the grade of the mineral powder is S95, and the activity index 7d of the mineral powder is greater than 75% , 28d greater than 95%, specific surface area greater than 350m 2 / kg, with an average particle ...

Embodiment 2

[0039] The fair-faced concrete surface defect repair material of the present embodiment is made of the following components in parts by weight: 480 parts of Portland cement, 160 parts of limestone powder, 210 parts of mineral powder, 50 parts of silica fume, 13 parts of redispersible latex powder 19 parts of water reducer, 3 parts of cellulose ether, 45 parts of expansion agent, 2 parts of black toner, 2 parts of defoamer;

[0040] The cellulose ether is hydroxypropyl methylcellulose ether with a viscosity of 70,000 to 100,000 mpa.s; the defoamer is a silicone defoamer; the Portland cement is ordinary Portland cement P·O 42.5, with an average particle size of 12 μm to 17 μm; the limestone powder has a water content of less than 1%, and an average particle size of 6 μm to 10 μm; the grade of the mineral powder is S95, and the activity index 7d of the mineral powder is greater than 75% , 28d greater than 95%, specific surface area greater than 350m 2 / kg, with an average partic...

Embodiment 3

[0046] The fair-faced concrete surface defect repair material of the present embodiment is made of the following components in parts by weight: 550 parts of Portland cement, 120 parts of limestone powder, 170 parts of mineral powder, 30 parts of silica fume, 5 parts of redispersible latex powder 1 part, 15 parts of water reducer, 1 part of cellulose ether, 40 parts of expansion agent, 1 part of black toner, 1 part of defoamer;

[0047] The cellulose ether is hydroxypropyl methylcellulose ether with a viscosity of 70,000 to 100,000 mpa.s; the defoamer is a silicone defoamer; the Portland cement is ordinary Portland cement P·O 42.5, with an average particle size of 12 μm to 17 μm; the limestone powder has a water content of less than 1%, and an average particle size of 6 μm to 10 μm; the grade of the mineral powder is S95, and the activity index 7d of the mineral powder is greater than 75% , 28d greater than 95%, specific surface area greater than 350m 2 / kg, with an average pa...

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Abstract

The invention discloses a bare concrete surface defect repairing material. The repairing material is prepared from the following components: Portland cement, limestone powder, mineral powder, silica fume, redispersible latex powder, a water reducing agent, cellulose ether, an expanding agent, black toner and a defoaming agent, wherein the viscosity of the cellulose ether is hydroxypropyl methyl cellulose ether; and the defoaming agent is an organic silicon defoaming agent. By adjusting the ratio of the cementing material and doping the black toner, the repairing material has no chromatic aberration with the bare concrete, the powder with small particle size is adopted, the repairing material is suitable for small cracks, the problems that chromatic aberration exists and the small cracks are not easy to repair when the bare concrete is repaired are solved, the repaired cracks do not shrink due to the added expanding agent, and the repairing effect is good. The appearance quality problems of cracks, voids, pitted surfaces, mottles or coarse aggregate transparent layers and the like of the fair-faced concrete can be effectively solved, the repairing material has the properties of good bonding strength, high wear resistance and the like, and no color difference with the fair-faced concrete is achieved.

Description

technical field [0001] The invention belongs to the technical field of cement-based repair materials, and in particular relates to a repair material for fair-faced concrete surface defects and a preparation method thereof. Background technique [0002] Fair-faced concrete belongs to one-time pouring molding, does not need any decoration, directly uses the natural color of concrete as the decorative surface, has good environmental protection and economic benefits, and is widely used in a large number of engineering construction practices. However, due to the unreasonable construction technology of the construction personnel and the inadequate protection and maintenance measures, the appearance quality problems such as cracks, sand marks, honeycomb pockmarks, and mottled appearance appear on the surface of fair-faced concrete. Therefore, this requires us to use reasonable means to carry out surface repair. [0003] At present, there are three types of repair materials for fai...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B24/26C04B111/72C04B111/34C04B111/20C04B111/27
Inventor 王武锁王欢宋心赵世冉袁倩男任双倩
Owner 陕西秦汉恒盛新型建材科技股份有限公司
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