Preparation method of high-performance recycled aggregate concrete

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

Active Publication Date: 2015-04-29
SHANDONG DAYUAN IND
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  • Description
  • Claims
  • Application Information

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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

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preparation example Construction

[0035] A method for preparing recycled aggregate high-performance concrete, which comprises crushing waste concrete to obtain large stones with a particle size of 20-25 mm, small stones with a particle size of 5-20 mm, and sand with a particle size of less than 5 mm, and crushing Dust generated during the process is collected by wind; then polycarboxylate water reducer, cement and appropriate amount of water are added to large stones, small stones and sand to obtain the recycled aggregate high performance concrete.

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

[0037] S1. Send the waste concrete materials into the jaw crusher, and use the jaw crusher for crushing; it is worth noting that the waste concrete materials will be sieved before being sent in, and most of the sieved components are waste concrete soil , if these soils are mixed into the follow-up process, the performance of the obtained recycled aggregate...

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 the dust generated during the crushing process;

[0051] Mix 1100kg of large stones, 350kg of small stones, and 850kg of sand, and then add 14kg of polycarboxylate superplasticizer, and at the same time add 400kg of cement, 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 the dust generated during the crushing process;

[0054] Mix 700kg of large stones, 250kg of small stones, and 650kg of sand, add 7kg of polycarboxylate superplasticizer, and add 200kg of cement at the same time, stir and mix 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 preparation method of high-performance concrete prepared by utilizing recycled aggregate. Background technique [0002] At present, with the acceleration of the urbanization process, the social demand for concrete is increasing rapidly. The coarse and fine aggregate, which is an important raw material for concrete, is obviously insufficient. Therefore, technologies for recycling waste concrete have also been proposed at present. 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 the machine-made sand and gravel cannot be removed at all, so that the performance of the concrete is greatl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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