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Self-compacting concrete and preparation method thereof

A self-compacting concrete and concrete technology, applied in the field of building materials, can solve the problems of difficult promotion of recycled aggregates, limited scope of use, and unfavorable sustainable development.

Active Publication Date: 2021-04-27
SHENZHEN HUAWEI ENVIRONMENTAL PROTECTION BUILDINGMATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, there are existing self-compacting concrete products on the market, and the coarse and fine aggregates used in the production of raw materials are natural sandstone, which causes the consumption of natural resources and is not conducive to sustainable development; at the same time, the high water absorption of recycled aggregates, It is difficult to promote the application of recycled aggregates, and its use range is limited. In addition, with the advancement of urbanization, a large amount of engineering dregs cannot be safely and effectively disposed of, causing the environment to be destroyed again, and at the same time causing waste of resources

Method used

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preparation example Construction

[0028] The invention provides a kind of preparation method of self-compacting concrete, comprises the following steps:

[0029] The engineering dregs are dried, pulverized and ball-milled in sequence to obtain engineering dregs micropowder;

[0030] The engineering slag micropowder, the first cement, sodium silicate and the first water are sequentially mixed, granulated and maintained to obtain non-burning slag particles;

[0031] The construction waste is crushed and screened sequentially to obtain recycled fine aggregate;

[0032] After mixing the non-burning slag particles, recycled fine aggregate, second cement, fly ash, mineral powder, silica fume, second water, concrete defoamer and water reducing agent, molding, demoulding and curing are carried out in sequence , to obtain self-compacting concrete.

[0033] In the invention, engineering dregs are dried, pulverized and ball-milled in sequence to obtain engineering dregs micropowder. The present invention has no specia...

Embodiment 1

[0079] a. Dry the engineering slag to a moisture content of 1wt%, then pulverize it in a cone crusher, and then put it into a ball mill for ball milling. The ball milling time is 30 minutes, and the obtained material is put into a vibrating sieve for sieving. Particles with a particle size greater than or equal to 0.075 mm (this part of the material can be put back into the ball mill for ball milling), as long as the particle size is less than 0.075 mm, the micro-powder of engineering slag can be obtained.

[0080] Weighing materials: Weigh the engineering slag micropowder, cement, sodium silicate, and water according to the mass ratio of 0.8:0.08:0.03:0.02, and first put the engineering slag micropowder and cement into the granulator, and at the same time Mix water and sodium silicate together (need to mix evenly) and put it in a container that can spray water. The speed of the granulator is set at 20 revolutions per minute. When the granulator starts to start, it is filled wi...

Embodiment 2

[0088] a. Dry the engineering slag to a moisture content of 0.5wt%, then pulverize it in a cone crusher, and then put it into a ball mill for ball milling. The ball milling time is 20 minutes, and the obtained material is put into a vibrating screen for sieving. Remove particles with a particle size greater than or equal to 0.075 mm (this part of the material can be put back into the ball mill for ball milling), as long as the particle size is less than 0.075 mm, the engineering slag micropowder is obtained.

[0089] Weighing materials: Weigh the engineering slag micropowder, cement, sodium silicate, and water according to the mass ratio of 1.2:0.1:0.05:0.04, first put the engineering slag micropowder and cement into the granulator, and at the same time Mix water and sodium silicate together (need to mix evenly) and put it in a container that can spray water. The speed of the granulator is set at 20 revolutions per minute. When the granulator starts to start, it is filled with ...

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Abstract

The invention provides self-compacting concrete and a preparation method thereof, and belongs to the technical field of building materials. The preparation method provided by the invention comprises the following steps of: sequentially drying, crushing and ball-milling engineering muck to obtain engineering muck micro-powder; sequentially mixing the engineering muck micro-powder, first cement, sodium silicate and first water and carrying out granulating and curing to obtain baking-free muck particles; crushing and screening construction waste in sequence to obtain recycled fine aggregate; mixing the baking-free muck particles, the recycled fine aggregate, second cement, fly ash, mineral powder, silica fume, second water, a concrete defoaming agent and a water reducing agent, and then sequentially carrying out molding, demolding and curing to obtain the self-compacting concrete. According to the invention, the characteristic of high fluidity is obtained by utilizing the grain shape centrality (the grain shape coefficient approaches 1) and low water absorption rate of the baking-free muck particles, and the baking-free muck particles and the recycled fine aggregate are combined for use to complement each other, so that the brand-new self-compacting concrete with higher strength is obtained.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a self-compacting concrete and a preparation method thereof. Background technique [0002] At present, there are existing self-compacting concrete products on the market, and the coarse and fine aggregates used in the production of raw materials are natural sandstone, which causes the consumption of natural resources and is not conducive to sustainable development; at the same time, the high water absorption of recycled aggregates, It is difficult to promote the application of recycled aggregates, and its scope of use is limited. In addition, with the advancement of urbanization, a large amount of engineering dregs cannot be safely and effectively disposed of, resulting in the destruction of the environment again and waste of resources. Contents of the invention [0003] In view of this, the object of the present invention is to provide a self-compacting concrete and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B18/02C04B18/16
CPCC04B28/00C04B18/021C04B18/16C04B2201/50C04B18/08C04B18/12C04B18/146C04B2103/50C04B2103/302C04B7/00C04B12/04Y02W30/91
Inventor 关宇陆文奇吴晓珊陆启政封锦明郑建平
Owner SHENZHEN HUAWEI ENVIRONMENTAL PROTECTION BUILDINGMATERIAL
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