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Preparation method of high-performance recycled aggregate concrete

A high-performance concrete and recycled aggregate technology, applied in the field of concrete, can solve the problems of reduced concrete performance, inability to reuse, and large sludge pollution, etc., and achieve the effects of less mud content, avoiding the aggravation of engineering disasters, and superior concrete performance

Active Publication Date: 2013-01-30
SHANDONG DAYUAN IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology is to crush waste concrete, and then sieve it with a rotary sieve to obtain recycled aggregate. In order to remove fine powder, water washing is used to remove dust. The sludge pollution is very large and cannot be reused for a long time
The coarse and fine aggregate obtained by this method, the mortar on the surface of machine-made sand and gravel cannot be removed at all, so that the concrete performance is greatly reduced when the concrete is prepared later

Method used

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  • Preparation method of high-performance recycled aggregate concrete
  • Preparation method of high-performance recycled aggregate concrete
  • Preparation method of high-performance recycled aggregate concrete

Examples

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preparation example Construction

[0035] A method for preparing recycled aggregate high-performance concrete. The waste concrete is crushed to obtain large stones with a particle size of 20-25mm, small stones with a particle size of 5-20mm, and sand with a particle size of less than 5mm. The dust generated in the process is collected by wind; then, the large stones, small stones, and sand are added with polycarboxylic acid water reducing agent, cement and appropriate amount of water, and then the recycled aggregate high-performance concrete is prepared.

[0036] In the present invention, the crushing treatment of the waste concrete includes the following steps:

[0037] S1. Send the waste concrete material to the jaw crusher, and use the jaw crusher to crush; it is worth noting that the waste concrete material will be screened first before sending it, and the majority of the screened components are the waste concrete mud , If these soils are mixed into the subsequent processes, the performance of the recycled aggre...

Embodiment 1

[0050] Use waste concrete to prepare large stones with a particle size of 20-25mm, small stones with a particle size of 5-20mm, and sand with a particle size of less than 5mm, and wind-trap the dust generated during the crushing process;

[0051] Mix 1100kg boulders, 350kg small stones, and 850kg sand, and then add 14kg polycarboxylic acid water reducing agent and 400kg cement at the same time, stir and mix to make recycled aggregate concrete.

Embodiment 2

[0053] Use waste concrete to prepare large stones with a particle size of 20-25mm, small stones with a particle size of 5-20mm, and sand with a particle size of less than 5mm, and wind-trap the dust generated during the crushing process;

[0054] 700kg of big stones, 250kg of small stones, 650kg of sand are mixed and added 7kg of polycarboxylic acid water reducing agent, and at the same time 200kg of cement is added, and mixed to make recycled aggregate concrete.

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Abstract

A preparation method of high-performance recycled aggregate concrete is characterized in that waste concrete is broken to obtain large stones with granularity of 20 to 25mm, small stones with granularity of 5 to 20mm and sand with granularity of smaller than 5mm, and dust produced in the breaking process is pneumatically collected; and then the large stones, the small stones and sand are mixed with polycarboxylic acid water reducing agent, cement and appropriate water to further obtain the high-performance recycled aggregate concrete. Against for the special situation of the waste concrete, the waste concrete is smashed and screened on purpose, so that a new concept for treating the waste concrete is provided, the problems such as worsening of engineering disasters, resource waste and environmental pollution can be avoided, and the performance of the recycled concrete is excellent.

Description

Technical field [0001] The invention relates to the technical field of concrete, in particular to a method for preparing high-performance concrete prepared by using recycled aggregates. Background technique [0002] At present, with the acceleration of urbanization, the society's demand for concrete is increasing rapidly. The coarse and fine aggregates, which are important raw materials for concrete, are obviously insufficient. Therefore, technology for recycling waste concrete is now also proposed. In the prior art, waste concrete is crushed and then screened by a rotary screen to obtain recycled aggregate. In order to remove fine powder, water washing is used to remove dust. The sludge is very polluted and cannot be reused for a long time. The coarse and fine aggregates obtained by this method, the mortar on the surface of machine-made sand and stones cannot be removed at all, so that the performance of the concrete is greatly reduced when the concrete is prepared in the late...

Claims

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Application Information

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IPC IPC(8): C04B28/00
Inventor 季龙泉李全堂亓良树季元升
Owner SHANDONG DAYUAN IND
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