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Recycled concrete with added polypropylene fibers and preparation method of recycled concrete

A polypropylene fiber and recycled concrete technology, which is applied in the field of green concrete preparation, can solve the problems of low mechanical properties of recycled concrete, low utilization rate of recycled concrete, and low strength of recycled concrete, so as to reduce open-air stacking and landfill Effects of treatment and prevention of subsidence

Inactive Publication Date: 2019-03-15
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These characteristics of recycled aggregates lead to low strength and poor durability of recycled concrete, so currently recycled concrete is mostly used in non-structural and non-load-bearing concrete fields such as backfill and roadbed
Restricted by the application field, the utilization rate of recycled concrete is very low
The low mechanical properties of recycled concrete has become a bottleneck restricting the application of recycled concrete

Method used

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  • Recycled concrete with added polypropylene fibers and preparation method of recycled concrete
  • Recycled concrete with added polypropylene fibers and preparation method of recycled concrete

Examples

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preparation example Construction

[0032] The preparation method of the regenerated concrete that adds polypropylene fiber mainly comprises the following steps:

[0033] Step 1. According to the above mixing ratio, pour the recycled coarse aggregate, recycled fine aggregate, cement, and polypropylene fiber into the mixer, and mix evenly; the specific mixing time is 60-90s, and the mixing rate is 30 rpm;

[0034] Step 2. Pour the water into the concrete mixer in batches, and mix evenly to obtain recycled concrete added with polypropylene fibers.

[0035] Further, pour the water into the concrete mixer three times, the mixer continues to stir during the pouring process, the stirring rate is 20 rpm, the pouring interval is 30-50s, and the water pouring volume for the three times is 50%, 30% and 20% of the total amount in turn. %; To avoid the problem that the concrete cannot be fully absorbed by adding water at one time. Adding water in stages can allow the concrete to fully absorb during the mixing process, which...

Embodiment 1

[0043] A new type of concrete proposed in this embodiment, the concrete raw materials are proportioned by mass and include the following components: 226 parts of water, 240 parts of cement, 860 parts of recycled coarse aggregate with a particle size of 5 mm, and a fineness modulus of 3.0 525 parts of recycled fine aggregate, 0.75 parts of polypropylene fiber with a diameter of 0.2 mm and a length of 20 mm.

[0044] Among them, the recycled coarse aggregate is obtained by crushing and screening waste sintered bricks, and the recycled fine aggregate is obtained by crushing and screening waste concrete.

Embodiment 2

[0046] A new type of concrete proposed in this embodiment, the concrete raw materials are proportioned by mass and include the following components: 220 parts of water, 230 parts of cement, 850 parts of recycled coarse aggregate with a particle size of 10 mm, and a fineness modulus of 3.0 525 parts of recycled fine aggregate, 1.5 parts of polypropylene fiber with a diameter of 0.3 mm and a length of 50 mm.

[0047] Among them, the recycled coarse aggregate is obtained by crushing and screening waste sintered bricks, and the recycled fine aggregate is obtained by crushing and screening waste concrete.

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Abstract

The invention discloses recycled concrete with added polypropylene fibers. The polypropylene fibers are added to concrete in a ratio, and the effect of fine distribution of reinforcement can be realized; furthermore, the polypropylene fibers can be blended with a cement material very well, so that fine distribution effect is realized; on the basis of the characteristics of a large number and a large specific surface area of the polypropylene fibers, the polypropylene fibers can be uniformly distributed in concrete to form a three-dimension space net structure, the aggregate supporting effect is realized, therefore, anti-cracking performance of the concrete is improved, sedimentation of coarse and fine aggregate is prevented, pore channels in the concrete are reduced, and the polypropylenefibers can inhibit crack propagation of the concrete. Mechanical properties and durability of the concrete can be affected by addition of recycled coarse aggregate, and due to the fact that the polypropylene fibers can change the pore structure in the recycled concrete, the polypropylene fibers produce beneficial effects on strength and durability of the recycled concrete.

Description

technical field [0001] The invention belongs to the technical field of green concrete preparation methods, and specifically designs recycled concrete added with polypropylene fibers and a preparation method thereof. Background technique [0002] With the rapid development of urbanization around the world, the accumulation and treatment of construction waste has become an obstacle to urban development. In my country's concrete industry, river sand and stone sand are mainly used as fine aggregates, and crushed stones and pebbles are used as coarse aggregates. However, the mining of coarse aggregate will inevitably bring about a series of environmental problems, such as: destroying vegetation and destroying the mountain, thus destroying the ecological balance. However, recycling waste construction waste (waste bricks and waste concrete) and crushing them into recycled coarse and fine aggregates can effectively solve the current increasingly scarce natural rock resources and ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C04B111/34
CPCC04B28/02C04B2111/00017C04B2111/343C04B2201/50C04B18/167C04B16/0633
Inventor 朱勇锋刘妮娜刘振谦李俊冯骁阳肖云飞杨招
Owner CHANGAN UNIV
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