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Preparation technology of high-elastic modulus fiber self-stress recycled concrete

A recycled concrete and production process technology, which is applied in the production process of high elastic modulus fiber self-stressed recycled concrete, can solve the problems of too many internal cracks, poor performance of recycled concrete, poor ductility, etc., to reduce initiation and expansion, and improve strength , the effect of improving ductility

Pending Publication Date: 2019-02-22
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This new type of material can solve the problems of waste concrete reuse, poor performance of recycled concrete, excessive internal cracks, poor ductility, etc., and can significantly improve the mechanical performance of recycled aggregate concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A manufacturing process of high elastic modulus fiber self-stressing recycled concrete, comprising the following steps:

[0034] Step 1. Mix self-stressing cement, high elastic modulus fiber, mineral powder, silica fume, rubber particles, and high-efficiency water reducer for 2 to 8 minutes until uniform;

[0035] Step 2, within 15 minutes, add concrete mixing water to the mixture in step 1, and stir for 1.5 to 3 minutes to produce cement paste;

[0036] Step 3, within 15 minutes, add fine aggregate to the cement slurry in step 2 and mix for 1.5 to 3 minutes, evenly, to produce cement mortar slurry;

[0037] Step 4, within 15 minutes, add coarse aggregate composed of natural coarse aggregate and recycled coarse aggregate to the cement mortar slurry in step 3 and mix for 1.5 to 3 minutes until uniform, and produce high elastic modulus fiber Self-stressing recycled aggregate concrete. The high elastic modulus fiber is a high elastic modulus fiber. The prepared high ela...

Embodiment 2

[0039] 1. Mix 750 parts of sulphoaluminate self-stressing cement, 47.1 parts of end hook steel fiber, 4.88 parts of mineral powder, 4.02 parts of rubber particles, 2.22 parts of silica fume, and 0.075 parts of superplasticizer for 2 to 8 minutes, until Uniform;

[0040] 2. Within 15 minutes, add 270.5 parts of mixing water to the mixture in step 1, and stir for 1.5 to 3 minutes to make cement paste;

[0041] 3. Within 15 minutes, add 634.1 parts of fine aggregate to the cement slurry in step 2 and mix for 1.5 to 3 minutes until it is uniform to make a cement mortar slurry;

[0042] 4. Within 15 minutes, add 182.3 parts of natural coarse aggregate and 546.7 parts of recycled coarse aggregate to the cement mortar slurry in step 3 and mix for 1.5 to 3 minutes until uniform, and produce fiber self-stressing recycled aggregate concrete ; The high elastic modulus fiber self-stress regenerative concrete should be poured within 30 minutes. If the recycled concrete undergoes initial ...

Embodiment 3

[0046] 1. Mix 750 parts of sulfoaluminate self-stressing cement, 47.1 parts of end hook steel fiber, 2.16 parts of mineral powder, 3.32 parts of rubber particles, 2.22 parts of silica fume, and 0.9 parts of superplasticizer for 2 to 8 minutes until Uniform;

[0047] 2. Within 15 minutes, add 225.9 parts of mixing water to the mixture in step 1, and stir for 1.5 to 3 minutes to make cement paste;

[0048] 3. Within 15 minutes, add 675.8 parts of fine aggregate to the cement slurry in step 2 and mix for 1.5 to 3 minutes until it is uniform to make a cement mortar slurry;

[0049] 4. Within 15 minutes, add 378 parts of natural coarse aggregate and 378 parts of recycled coarse aggregate to the cement mortar slurry in step 3 and mix for 1.5 to 3 minutes until uniform, and produce fiber self-stressing recycled aggregate concrete ; The high elastic modulus fiber self-stress regenerative concrete should be poured within 30 minutes. If the recycled concrete undergoes initial setting ...

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Abstract

The invention discloses a preparation technology of high-elastic modulus fiber self-stress recycled concrete. The high-elastic modulus fiber self-stress recycled concrete is prepared from the following components: recycled coarse aggregate, natural coarse aggregate, natural fine aggregate, cement, a superplasticizer, mixed water, fiber, mineral powder, silica fume and rubber particles, wherein thefiber adopts one of high-elastic modulus fiber such as steel fiber, carbon fiber, basalt fiber and fiberglass. According to the preparation technology disclosed by the invention, expansion of internal microdefects of recycled concrete can be relieved by utilizing the high-elastic modulus fiber, and the bending strength, the tensile strength and the toughness of the recycled concrete can be increased; meanwhile, the fiber per se has higher elastic modulus, so that the elastic modulus of the recycled concrete and the rigidity of components can be increased; the strength of the concrete can be increased by utilizing the mineral powder and the silica fume, and creep of the concrete can be reduced; the ductility of the concrete can be increased by utilizing the rubber particles, chloride penetration resistance and the freezing resistance of the recycled concrete can be improved, and the durability of the recycled concrete can be enhanced.

Description

technical field [0001] The invention relates to a manufacturing process of recycled concrete, in particular to a manufacturing process of high elastic modulus fiber self-stress recycled concrete. Background technique [0002] With the rapid development of the construction industry, a large amount of construction waste is produced in the process of building construction and demolition, of which 30% to 40% are waste concrete. The resulting problems of land occupation and environmental pollution have attracted widespread attention at home and abroad. The social sustainable development strategy formulated by the Chinese government encourages the research and application of waste recycling technology. In 1997, the Ministry of Housing and Urban-Rural Development listed "Comprehensive Utilization of Construction Waste Residue" as a key promotion project of scientific and technological achievements. In 2002, the Shanghai Municipal Government included "developing recycled waste conc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B111/20C04B111/28
CPCC04B28/06C04B2111/00017C04B2111/20C04B2111/28C04B2201/50C04B7/02C04B14/48C04B14/386C04B14/46C04B14/42C04B18/141C04B18/146C04B18/22C04B2103/302
Inventor 卢亦焱刘真真李杉梁鸿骏胡霁月
Owner WUHAN UNIV
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