Anti-cracking concrete

A concrete and gravel technology, applied in the field of building materials, can solve problems such as unsatisfactory repair effect, safety and durability of large-scale water conservancy projects, and easy cracks in concrete

Inactive Publication Date: 2010-06-02
湖北白莲河抽水蓄能有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Concrete is an essential and important material in building construction, but because concrete is a brittle material, the concrete obtained according to conventional components and proportions is prone to cracks, and the cracks in the concrete are harmful to construction projects, especially large-scale water conservancy projects. The safety and durability of the concrete will have a great impact, and after the concrete cracks, the repair effect is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment 1, the amount of used concrete per square concrete material is: 185kg water, 250kg cement, 780kg sand, 638kg10~20mm small stone, 435kg20~40mm medium stone, 70kg first-grade fly ash, 35kg expansion agent (UEA), 2.35kg high-efficiency Retarding superplasticizer (LK-F2) and 0.85kg special concrete polypropylene fiber. After testing, the water-cement ratio of the concrete is 0.51, the 7-day compressive strength is 23.1mpa, and the 28-day compressive strength is 33.2.

[0009] The above-mentioned concrete was used in the construction of the rock anchor beam of the underground powerhouse. After long-term operation and observation, no cracks were found.

Embodiment 2

[0010] Embodiment 2, the amount of used concrete per square concrete material is: 180kg water, 248kg cement, 794kg sand, 645kg10~20mm small stone, 436kg20~40mm medium stone, 75kg first-class fly ash, 35kg expansion agent (UEA), 2.3kg high-efficiency Retarding superplasticizer (LK-F2) and 0.9kg special concrete polypropylene fiber. After testing, the water-cement ratio of the concrete is 0.50.

[0011] The above-mentioned concrete was used in the construction of the rock anchor beam of the underground powerhouse. After long-term operation and observation, no cracks were found.

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Abstract

The invention provides anti-cracking concrete, which comprises water, cement, sand, crushed stones, fly ash, expanding agent, admixture and polypropylene fiber in a weight ratio of 200-220:275-300:870-920:1,190-1,280:75-85:38-42:2.5-2.8:1 and is prepared by stirring and mixing the water, the moderate-heat portland cement, the sand, the crushed stones, the fly ash, the admixture and the special concrete polypropylene fiber, pouring the mixture and allowing the mixture to cur, wherein the water to cement ratio of the anti-cracking concrete is 0.49 to 0.52. Tests prove that the anti-cracking concrete with a unique mixing ratio and unique components including the polypropylene fiber can effectively prevent cracks caused by non-structural factors such as the temperature of the concrete and air shrinkage to the surfaces and interiors of rock-anchored beams in large key water-control projects.

Description

[0001] the field [0002] The invention relates to an anti-crack concrete, which belongs to the field of building materials. Background technique [0003] Concrete is an essential and important material in building construction, but because concrete is a brittle material, the concrete obtained according to the conventional composition and proportioning construction is prone to cracks, and the cracks in the concrete are harmful to construction projects, especially large-scale water conservancy projects. The safety and durability of the concrete will have a great impact, and after the concrete cracks, the repair effect is not ideal. Contents of the invention [0004] In order to overcome the problems existing in the prior art, the invention provides an anti-crack concrete, which adds a small amount of special polypropylene fiber in the composition, and improves the anti-crack ability of the concrete. [0005] The technical scheme that realizes the object of the present invent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B14/06C04B18/08C04B16/06
CPCY02W30/91
Inventor 唐健胡代清王建平
Owner 湖北白莲河抽水蓄能有限公司
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