High performance concrete composite mineral additive prepared from construction wastes and preparation method thereof

A high-performance concrete and construction waste technology, applied in the field of comprehensive utilization of construction waste, can solve the problems of sand powder utilization, secondary environmental pollution, etc., and achieve the effect of fine fineness, high product activity and low cost

Inactive Publication Date: 2015-11-18
GUANGZHOU SHIZHENG ENVIRONMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, nearly 15% of the sand powder in the actual construction waste treatment process cannot be used as recycled aggregates for concrete, mortar, and bricks. Most manufacturers have not utilized this part of the sand powder, and some of them are used for nearby Cement plants are used as admixtures, and some are still discarded, causing secondary environmental pollution

Method used

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  • High performance concrete composite mineral additive prepared from construction wastes and preparation method thereof
  • High performance concrete composite mineral additive prepared from construction wastes and preparation method thereof
  • High performance concrete composite mineral additive prepared from construction wastes and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A high-performance concrete composite mineral admixture utilizing construction waste is prepared from construction waste powder with a weight of 300kg, slag powder with a weight of 400kg and fly ash with a weight of 300kg.

[0028] Its preparation method comprises the following steps:

[0029] (1) Pretreatment of construction waste powder: the collected construction waste is dedusted and collected powder, sieved to remove coarse particles with a particle size larger than 0.16cm, and collect powder with a particle size smaller than 0.16cm, and pass through the conveying equipment Continuously mixed and collected into construction waste powder;

[0030] (2) Raw material weighing: weigh construction waste powder, slag powder and fly ash according to the above weight;

[0031] (3) The construction waste powder, slag powder and fly ash in step (2) are transported to a gravity-free mixer for homogenization;

[0032] (4) The powder homogenized in step (3) is supplied to the ...

Embodiment 2-8

[0034] The raw materials were weighed according to the proportions in Table 1, and prepared according to the steps in Example 1. The difference is that the added raw material proportions are different, and the products are prepared. See Table 1 for details:

[0035] Table 1: Raw material ratio table of embodiment 2-8

[0036]

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Abstract

The invention discloses a high performance concrete composite mineral additive prepared from construction wastes. The additive comprises 1 to 99 wt% of powdery construction wastes and 1 to 99 wt% of active additive. According to the preparation method, the powdery construction wastes are mixed with at least one component of slag powder, steel slag powder, fly ash, silica fume, meta-kaolin powder, and limestone powder according to a certain ratio, and then the mixture is subjected to ultrafine powder processing. The provided high performance concrete composite mineral additive has the advantages of fineness, reasonable and continuous grain size gradation, and high activity. The prepared concrete containing the additive can meet or even exceed the standards of common high performance concrete.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of construction waste, and more specifically relates to a high-performance concrete composite mineral admixture utilizing construction waste and a preparation method thereof. Background technique [0002] Construction waste is mainly composed of road repair, demolition and reconstruction waste, demolished old building waste, new construction waste, and decoration and demolition waste. Mortar, waste tiles, etc. They can be decomposed into recycled coarse and fine aggregates, sand, and sand powder materials through modern and mature construction waste treatment technology. Among them, recycled coarse and fine aggregates can be used for recycled concrete, sand can be used for recycled bricks, mortar, etc., and sand powder can be further separated into ultra-fine sand and coarse powder materials; ultra-fine sand can be used as aggregate for special mortar . [0003] However, nearly 15% of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/10B09B3/00
CPCY02W30/58
Inventor 张瑞军刘光孙皓
Owner GUANGZHOU SHIZHENG ENVIRONMENT CO LTD
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