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Coal slag powder chlorine-oxygen-magnesium cement stable regenerated concrete aggregate and preparation method thereof

A technology of recycled concrete and magnesium oxychloride cement, which is applied in the field of building materials, can solve the problems of low utilization rate, and achieve the effects of convenient material collection, alleviating shortage, and saving cultivated land

Inactive Publication Date: 2018-09-28
NANCHANG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are hundreds of millions of tons of cinders stacked in the open air in our country, and only some of them are currently used for brick

Method used

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  • Coal slag powder chlorine-oxygen-magnesium cement stable regenerated concrete aggregate and preparation method thereof
  • Coal slag powder chlorine-oxygen-magnesium cement stable regenerated concrete aggregate and preparation method thereof
  • Coal slag powder chlorine-oxygen-magnesium cement stable regenerated concrete aggregate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0040] Example 1

[0041] First, the recycled concrete aggregate is produced according to the following process.

[0042] Specifically, the waste cement concrete road slabs, demolished building components, waste cement concrete test blocks, etc. are collected together; the recycled waste concrete is sequentially crushed, de-reinforced, secondly crushed, and obtained by screening. Recycled concrete aggregates in the particle size range are required; the mass percentage of the obtained recycled concrete aggregates through the following sieve holes is shown in Table 2.

[0043] Table 2 The content of recycled concrete aggregate passing through each sieve

[0044]

[0045] The crushed value of the obtained recycled concrete aggregate is 22.6% and the apparent density is 2.69g / cm 3 .

[0046] The sieving results in Table 2 above were mixed at a mass ratio of 13.4% rice sand, 39.2% melon seed flakes, 33.5% small crushed pieces, and 13.9% medium crushed pieces to obtain recycled concrete aggr...

Example Embodiment

[0053] Example 2

[0054] First, the recycled concrete aggregate is produced according to the following process.

[0055] Specifically, the waste cement concrete road slabs, demolished building components, waste cement concrete test blocks, etc. are collected together; the recycled waste concrete is sequentially crushed, de-reinforced, secondly crushed, and obtained by screening. Recycled concrete aggregates in the particle size range are required; the mass percentages of the obtained recycled concrete aggregates through the following sieve holes are shown in Table 4.

[0056] Table 4 The content of recycled concrete aggregate passing through each sieve

[0057]

[0058] The crushed value of the obtained recycled concrete aggregate is 24.6% and the apparent density is 2.72g / cm 3 .

[0059] The sieving results in Table 4 above were mixed at a mass ratio of 16.6% rice sand, 37.7% melon seed flakes, 25.6% small pieces, and 20.1% medium pieces to obtain recycled concrete aggregates.

[0060...

Example Embodiment

[0063] Example 3

[0064] In the description of Embodiment 3, the similarities with Embodiment 1 will not be repeated here, and only the differences from Embodiment 1 will be described. The difference between Example 3 and Example 1 is that a mixture of sodium phosphate, ferrous sulfate and alum with a mass ratio of 1:1:2 is used as an anti-water additive, and it is based on magnesium oxide, cinder powder, magnesium chloride, and water-resistant The mass ratio of the additives to the recycled concrete aggregate is 1.22:0.50:1.88:0.40:96. The mixed materials are mixed; the rest refer to the description in Example 1, to obtain the cinder powder magnesium oxychloride cement stabilized recycled concrete aggregate of this example.

[0065] Using the same measuring method as in Example 1, the service performance of the coal slag powdered magnesium oxychloride cement stabilized recycled concrete aggregate was measured. The maximum dry density and the optimal water content determined by t...

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Abstract

The invention discloses a coal slag powder chlorine-oxygen-magnesium cement stable regenerated concrete aggregate, which comprises the following components in percentage by mass: 93 to 97 percent of arecycled concrete aggregate, 0.9 to 2.6 percent of a magnesium oxide, 0.4 to 1.5 percent of a coal slag powder, 1.2 to 2.9 percent of a magnesium chloride, and 0.3 to 0.5 percent of a water-resistantadditive. The preparation method of the coal slag powder chlorine-oxygen-magnesium cement stable regenerated concrete aggregate also is disclosed. The coal slag powder chlorine-oxygen-magnesium cement stable regenerated concrete aggregate of the invention has the characteristics of convenient material collection, energy conservation and environmental protection, and is a novel building material;a large amount of solid waste, such as waste concrete, coal slag, and brucite, can be used to solve the problems of environmental protection and occupation of land caused by waste concrete and coal cinders, as well as to relieve increasing shortage of sand and gravel, and cement resources, the application range of the chlorine-oxygen-magnesium cement is expanded, has far-reaching influence and wide application prospect; the unconfined compressive strength meets the specification requirement, and the construction progress can be accelerated.

Description

technical field [0001] The invention belongs to the technical field of building materials, and specifically relates to a cinder powder magnesium oxychloride cement stabilized recycled concrete aggregate and a preparation method thereof. Background technique [0002] Every year, my country's infrastructure construction requires hundreds of billions of tons of sand and gravel materials, causing "green mountains to hang white and rivers to turn yellow", which seriously affects the environment of our country. At the same time, sand and gravel resources are non-renewable. In order to protect the environment and limited sand and gravel There is an urgent need to use other materials to replace sand and gravel resources. At the same time, hundreds of millions of tons of waste concrete are stacked in the open air every year in our country, which pollutes the environment and occupies a large amount of land resources; therefore, the recycling of waste concrete has become the focus of re...

Claims

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Application Information

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IPC IPC(8): C04B28/32
CPCC04B28/32C04B2201/50C04B18/06C04B18/16C04B2103/65C04B20/0076
Inventor 张立明李佳詹钦鹏赖明钰叶红乐张轩图
Owner NANCHANG INST OF TECH
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