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Hybrid fiber regenerated concrete, and preparation thereof

A technology of recycled concrete and hybrid fiber, which is applied in the field of building materials, can solve the problems of many edges and corners, poor working performance of recycled concrete, rough surface of recycled coarse aggregate, etc., and achieve the effect of solving environmental protection problems

Inactive Publication Date: 2016-04-13
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the surface of recycled coarse aggregate is rough, with many edges and corners, and the surface is covered with a considerable amount of cement mortar with large voids and high water absorption rate, coupled with the accumulation of damage in the process of disintegration and crushing of concrete blocks, there are a large number of microcracks inside. The work performance of the mixed recycled concrete is deteriorated, which limits its application range

Method used

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  • Hybrid fiber regenerated concrete, and preparation thereof
  • Hybrid fiber regenerated concrete, and preparation thereof
  • Hybrid fiber regenerated concrete, and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A mixed fiber recycled concrete, containing per cubic meter of concrete: 0.5kg of alkali-resistant glass fiber, 0.5kg of polypropylene fiber, 400kg of cement, 100kg of fly ash, 175kg of water, 1000kg of recycled coarse aggregate and 750kg of sand.

[0028] The cement is ordinary Portland composite cement, the label is 32.5, and the configuration strength is C30.

[0029] The recycled coarse aggregate is obtained by screening the waste concrete taken from the construction site, and its particle size is 10-20mm.

[0030] The preparation method of the hybrid fiber recycled concrete comprises the following steps:

[0031] The first step is to prepare recycled coarse aggregate;

[0032] In the second step, mix the saturated surface-dry recycled aggregate with the required cement and fly ash for 1 minute, then add 50% of the required water and stir for another 1 minute;

[0033] In the third step, put the polypropylene fiber and alkali-resistant glass fiber into the remaini...

Embodiment 2

[0040] The amount of alkali-resistant glass fiber is 0.3kg, the amount of polypropylene fiber is 0.7kg, and the consumption of other components is consistent with that of Example 1.

Embodiment 3

[0042] The amount of alkali-resistant glass fiber is 0.7kg, the amount of polypropylene fiber is 0.3kg, and the consumption of the remaining components is consistent with that of Example 1.

[0043] The invention mixes a certain amount of mixed fibers (alkali-resistant glass fibers and polypropylene fibers) into the recycled concrete in a certain proportion. In hybrid fiber concrete: On the one hand, the glass fiber with high elastic modulus acts as a reinforcing material. When the tiny cracks in the concrete expand under the external load, the fiber bridges between the cracks and relieves the cracks. The stress concentration at the tip increases the crack propagation resistance and improves the crack resistance of concrete; on the other hand, the polypropylene fiber, which has a lower elastic modulus than concrete but a much larger elongation at break, can significantly improve the post-crack performance of concrete. Deformation ability, forming multi-site, multi-point cracki...

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Abstract

The invention relates to a hybrid fiber regenerated concrete, and preparation thereof. Each cubic meter of the hybrid fiber regenerated concrete comprises 0.5kg of alkali-resistant glass fiber, 0.5kg of polypropylene fiber, 400kg of cement, 100kg of flyash, 175kg of water, 1000kg of recycled coarse aggregate, and 750kg of sand. According to the invention, waste cement is taken as an ecological construction material, and enhanced hybrid fiber is added so as to prepare an enhanced ecological wall material with relatively high toughness and ductility, and building waste treatment problems and novel building material requirement problems can be solved.

Description

technical field [0001] The invention belongs to the technical field of building materials and relates to a novel middle-high-rise assembled ecological composite wall hybrid structure system, which can also be used in the structure system of ordinary buildings, in particular to a hybrid fiber recycled concrete and its preparation. Background technique [0002] As a traditional industry in my country, housing construction has been in the extensive production stage for a long time, with excessive energy and raw material consumption, low industrialization, low labor productivity and technical content, single structural form, and poor building quality and functions, especially residential structures. The anti-seismic safety and comfort need to be improved urgently. The research group organically combined the original ecological composite wall structure with concrete vertical restraint components, learned from each other's strengths and learned from each other's strengths, and prop...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B14/42C04B16/06C04B18/08C04B18/16
CPCY02W30/91
Inventor 黄炜许洪飞陈建仓杨树森任杉杉李斌
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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