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Concrete with cracking resistance and freezing resistance

A technology of concrete and frost resistance, applied in the field of concrete, can solve the problems of steel surface corrosion, passivation film damage, concrete cracking, etc., to achieve good frost resistance, high anti-cracking performance, and the effect of increasing weight

Active Publication Date: 2021-06-01
广州市粤砼混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When using concrete to build a house, concrete is often used in conjunction with a steel frame to improve the stability of the house; when constructing concrete in an environment with a large temperature difference between day and night, the concrete needs to have a good antifreeze effect. The existing concrete Antifreeze agents mainly include chloride salt and nitrite. The antifreeze effect of chloride salt is better than that of nitrite, but the addition of chloride salt will make the concrete contain free chloride ions, which are easy to occur in the capillary structure inside the concrete. Penetration and migration, when the chloride ions reach the surface of the steel bar, it is easy to damage the passivation film on the surface of the steel bar, thus causing the surface of the steel bar to corrode; after the steel bar is corroded, it will expand in volume, which will lead to concrete cracking

Method used

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  • Concrete with cracking resistance and freezing resistance
  • Concrete with cracking resistance and freezing resistance

Examples

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Effect test

preparation example 1

[0038] Preparation example 1: Modified asbestos fiber is prepared by the following method:

[0039] ① Weigh 4.5kg of 2-hydroxyethyl acrylate and place it in 55kg of absolute ethanol and stir for 3min at a speed of 550r / min to obtain a mixed solution;

[0040] ② Weigh 45kg of asbestos fibers and dry them at 55°C for 20 minutes, place the dried asbestos fibers in an irradiation container, then add the mixture prepared in ①, press the cap with a film with small holes, and pump Vacuum, after vacuum degassing, rush into nitrogen, seal and place on the oscillator, use JJ-2 type electron electrostatic accelerator to irradiate, the electron beam energy is 1.7MeV, and the irradiation time is 30min, and the modified asbestos fiber is obtained .

preparation example 2

[0041] Preparation example 2: Modified asbestos fiber is prepared by the following method:

[0042] ① Weigh 2kg of 2-hydroxyethyl acrylate and place it in 45kg of absolute ethanol and stir for 3min at a speed of 550r / min to obtain a mixed solution;

[0043] ②Weigh 35kg of asbestos fibers and dry them at 55°C for 20 minutes, place the dried asbestos fibers in an irradiation container, then add the mixture prepared in ①, cover with a film with small holes, and pump Vacuum, after vacuum degassing, rush into nitrogen, seal and place on the oscillator, use JJ-2 electron electrostatic accelerator to irradiate, the electron beam energy is 1.7MeV, and the irradiation time is 25min, and the modified asbestos fiber is obtained .

preparation example 3

[0044] Preparation example 3: Modified asbestos fiber is prepared by the following method:

[0045] ① Weigh 6kg of 2-hydroxyethyl acrylate and place it in 65kg of absolute ethanol and stir for 3min at a speed of 550r / min to obtain a mixed solution;

[0046] ② Weigh 55kg of asbestos fibers and dry them at 55°C for 20 minutes, place the dried asbestos fibers in an irradiation container, then add the mixture prepared in ①, cover with a film with small holes, and pump Vacuum, after vacuum degassing, rush into nitrogen, seal and place on the oscillator, use JJ-2 type electron electrostatic accelerator to irradiate, the electron beam energy is 1.7MeV, and the irradiation time is 35min, and the modified asbestos fiber is obtained .

[0047] Preparation example of composite fiber

[0048] The polylactic acid fibers in the following raw materials were purchased from polylactic acid staple fibers produced by Shaoxing Xineng Textile Technology Co., Ltd., with a length of 6mm; polyethyl...

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Abstract

The invention relates to the field of concrete, and particularly discloses concrete with cracking resistance and freezing resistance, which is prepared from the following raw materials in parts by weight: 310 to 400 parts of cement, 50 to 70 parts of fly ash, 70 to 90 parts of mineral powder, 600 to 680 parts of river sand, 1060 to 1150 parts of gravel, 140 to 160 parts of water, 5.2 to 9.6 parts of water reducing agent, 2.7 to 3.3 parts of anti-freezing agent and 15 to 22 parts of composite fiber. The composite fiber is prepared from the following raw materials in parts by weight: 15-25 parts of polylactic acid fiber and 16-28 parts of modified asbestos fiber, when the concrete is matched with a steel reinforcement framework for use, the concrete has anti-cracking performance and anti-freezing performance at the same time.

Description

technical field [0001] The present application relates to the field of concrete, more specifically, it relates to a concrete with anti-cracking and frost resistance. Background technique [0002] With the development of society, concrete is mostly used in housing construction, factory buildings, roads, bridges, seaport terminals and other projects. [0003] When using concrete to build a house, concrete is often used in conjunction with a steel frame to improve the stability of the house; when constructing concrete in an environment with a large temperature difference between day and night, the concrete needs to have a good antifreeze effect. The existing concrete Antifreeze agents mainly include chloride salt and nitrite. The antifreeze effect of chloride salt is better than that of nitrite, but the addition of chloride salt will make the concrete contain free chloride ions, which are easy to occur in the capillary structure inside the concrete. Osmotic migration, when chl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C04B20/10C04B14/40C04B16/06C04B24/04C04B103/60
CPCC04B28/02C04B40/0039C04B20/0068C04B20/1022C04B20/104C04B2111/343C04B2103/601C04B2111/00293C04B2201/52C04B18/08C04B18/12C04B14/06C04B14/02C04B2103/302C04B22/124C04B22/085C04B24/045C04B16/0675C04B14/40
Inventor 钟敏
Owner 广州市粤砼混凝土有限公司
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