Lime coal cinder powder stable regeneration concrete aggregates and preparation method thereof

A technology for recycling concrete and coal slag powder, applied in the field of building materials, can solve problems such as low utilization rate, achieve the effects of convenient material selection, solve environmental pollution, and enhance utilization value

Inactive Publication Date: 2018-11-02
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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  • Lime coal cinder powder stable regeneration concrete aggregates and preparation method thereof
  • Lime coal cinder powder stable regeneration concrete aggregates and preparation method thereof
  • Lime coal cinder powder stable regeneration concrete aggregates and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] First, recycled concrete aggregates were produced by the following process.

[0047] 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.

[0048] Table 2 Content of recycled concrete aggregate passing through each sieve hole

[0049]

[0050] The resulting recycled concrete aggregate had a crush value of 22.6% and an apparent density of 2.69 g / cm 3 .

[0051]The sieving results in the above Table 2 were mixed according to the mass ratio of 43.4% rice sand, 19.2% melon seed slices, 23.5% small crushed and 13.9% medium crushed to obtain r...

Embodiment 2

[0060] First, recycled concrete aggregates were produced by the following process.

[0061] 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.

[0062] Table 4 The content of recycled concrete aggregate passing through each sieve hole

[0063]

[0064] The resulting recycled concrete aggregate had a crush value of 24.6% and an apparent density of 2.72 g / cm 3 .

[0065] The sieving results in the above Table 4 were mixed according to the mass ratio of 45.6% rice sand, 18.7% melon seed slices, 25.6% small crushed and 10.1% medium crushed to obtain recycled concrete aggreg...

Embodiment 3

[0070] 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 in the present embodiment, the composite additive is 50% CaSO by mass percentage 4 2H 2 O and 50% by mass CaCl 2 Composition; The rest are described with reference to embodiment 1, obtain the lime cinder powder stabilized recycled concrete aggregate of the present embodiment.

[0071] Using the same measuring method as in Example 1, the performance of the lime cinder powder stabilized recycled concrete aggregate of this example was measured. According to the maximum dry density and optimum water content determined by the vibration test, 11.36% tap water with a mass of lime cinder powder stabilized recycled concrete aggregate was added to it for mixing, and the unconfined ages of 7d and 28d were measured respectively. The compressive strengths are 1.7...

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Abstract

The invention discloses lime coal cinder powder stable regeneration concrete aggregates. The lime coal cinder powder stable regeneration concrete aggregates comprises the following components which are uniformly mixed in percentages by mass: 75%-85% of recycled concrete aggregates, 3%-10% of lime and 12%-20% of coal cinder powder as well as a composite additive which accounts for 2.0%-35% of the mass of the coal cinder powder. The invention further discloses a preparation method of the lime coal cinder powder stable regeneration concrete aggregates. The lime coal cinder powder stable regeneration concrete aggregates have the characteristics of convenience in material taking, energy conservation and environmental protection, and is a novel building material; solid wastes such as waste concrete and coal cinder are extensively utilized, problems of environmental pollution caused by waste concrete and coal cinders and land occupation can be solved, growing shortage of gravels and cement resources is relieved, and the lime coal cinder powder stable regeneration concrete aggregates have far-reaching influence and wide application prospect; and moreover, the unconfined compressive strength of the lime coal cinder powder stable regeneration concrete aggregates meets the code requirement, and the progress of construction can be accelerated.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a lime cinder powder stabilized regenerated 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 research in my country...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14C04B18/16C04B22/06C04B18/10C04B22/12
CPCC04B40/0039C04B18/16C04B22/064C04B18/10C04B22/124C04B22/143Y02W30/91
Inventor 张立明李佳杨波夏永吉涂一灿张轩图
Owner NANCHANG INST OF TECH
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