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Coal cinder powder magnesium oxysulfate cement stable recycled concrete aggregate and preparation method thereof

A technology for powdered magnesium oxysulfate cement and recycled concrete, which is applied in the field of building materials, can solve problems such as low utilization rate, and achieve the effects of convenient material selection, environmental protection, alleviation of land occupation problems, and expansion of application scope.

Active Publication Date: 2018-10-12
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 making, paving and cement mixture, but their utilization rate is low; therefore, it is urgent to improve their utilization rate and utilization value

Method used

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  • Coal cinder powder magnesium oxysulfate cement stable recycled concrete aggregate and preparation method thereof
  • Coal cinder powder magnesium oxysulfate cement stable recycled concrete aggregate and preparation method thereof
  • Coal cinder powder magnesium oxysulfate cement stable recycled concrete aggregate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] First, recycled concrete aggregates were produced by the following process.

[0042] Specifically, waste cement concrete road slabs, components of demolished buildings, waste cement concrete test blocks, etc. are collected and recycled; the recycled waste concrete is sequentially crushed for the first time, ribs removed, crushed for the second time, and obtained by screening. Recycled concrete aggregates in the particle size range are required; the mass percentages of the obtained recycled concrete aggregates passing through the following sieves are shown in Table 2.

[0043] Table 2 Content of recycled concrete aggregate passing through each sieve hole

[0044]

[0045] The resulting recycled concrete aggregate had a crush value of 22.6% and an apparent density of 2.69 g / cm 3 .

[0046] The sieving results in the above Table 2 were mixed according to the mass ratio of 33.4% rice sand, 29.2% melon seed slices, 23.5% small crushed and 13.9% medium crushed to obtain ...

Embodiment 2

[0054] First, recycled concrete aggregates were produced by the following process.

[0055] Specifically, waste cement concrete road slabs, demolished building components, waste cement concrete test blocks, etc. are collected and recycled; the recycled waste concrete is sequentially crushed, ribs removed, secondary crushed, and screened to obtain all Recycled concrete aggregates in the particle size range are required; the mass percentages of the obtained recycled concrete aggregates passing through the following sieve holes are shown in Table 4.

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

[0057]

[0058] The resulting recycled concrete aggregate had a crush value of 24.6% and an apparent density of 2.72 g / cm 3 .

[0059] The sieving results in the above Table 4 were mixed according to the mass ratio of 35.6% rice sand, 18.7% melon seed slices, 25.6% small crushed and 20.1% medium crushed to obtain recycled concrete aggreg...

Embodiment 3

[0064] In the description of Embodiment 3, the similarities with Embodiment 1 will not be repeated here, and only the differences with Embodiment 1 will be described. The difference between embodiment 3 and embodiment 1 is that it is 2.08:0.76:1.04:0.12:96 to mix each material according to the mass ratio of magnesia, cinder powder, magnesium sulfate, anti-water additive, recycled concrete aggregate; As described in Example 1, the cinder powder magnesium oxysulfate cement stabilized recycled concrete aggregate of this example was obtained.

[0065] The performance of the cinder powder magnesium oxysulfate cement stabilized recycled concrete aggregate of this embodiment was measured by the same measuring method as in Example 1. According to the maximum dry density and optimum water content determined by the vibration test, 10.68% of the quality of the recycled concrete aggregate stabilized by cinder powder magnesium oxysulfate cement was added to the tap water for mixing, and th...

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Abstract

The invention discloses a coal cinder powder magnesium oxysulfate cement stable recycled concrete aggregate. The aggregate is prepared by evenly mixing the following ingredients in percentage by mass:93-97% of recycled concrete aggregate, 1.56-3.12% of magnesium oxide, 0.57-1.90% of coal cinder powder, 0.76-1.80% of magnesium sulfate and 0.09-0.18% of a water-resistant additive. The invention further discloses a preparation method of the coal cinder powder magnesium oxysulfate cement stable recycled concrete aggregate. The coal cinder powder magnesium oxysulfate cement stable recycled concrete aggregate has the characteristics of convenient material taking, energy saving and environmental protection, and is a novel building material; the aggregate utilizes solid wastes such as waste concrete, coal cinder and bischofite in large quantity, the environmental protection and land occupying problems caused by waste concrete and coal cinder are solved, increasingly scarce sandstone and cement resources are relieved, the applied range of magnesium oxysulfate cement is expanded, and the aggregate has a far-reaching impact and a broad application prospect; and the aggregate does not have lateral confinement compressive strength, which meets the standard requirements, 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 oxysulfide 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 res...

Claims

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Application Information

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IPC IPC(8): C04B28/30
CPCC04B28/30C04B2201/50C04B18/16C04B9/00C04B18/10C04B2103/65
Inventor 张立明李佳张智越朱志于国新张轩图
Owner NANCHANG INST OF TECH
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