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Lithium slag expanding agent for concrete

An expansion agent and concrete technology, applied in the field of lithium slag expansion agent for concrete, can solve the problems of concrete strength, frost resistance, impermeability and durability decline, and achieve the effect of reducing production cost and simplifying process

Active Publication Date: 2018-08-21
江西省建材科研设计院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] After the concrete is poured, it usually shrinks in volume during the hardening process. Along with its volume shrinkage, micro-cracks are easily generated inside, which will cause concrete strength, frost resistance, impermeability and Decrease in durability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A lithium slag expanding agent for concrete. In parts by mass, 67 parts of sulfate-rich lithium slag powder, 17 parts of aluminosilicate-rich lithium slag powder, and 16 parts of sulfoaluminate cement clinker are placed into In a planetary ball mill, the lithium slag concrete expansion agent can be obtained by ball milling for 5 minutes at a speed of 480r / min and mixing uniformly.

Embodiment 2

[0015] A lithium slag expansion agent for concrete. In parts by mass, 42 parts of sulfate-rich lithium slag powder, 42 parts of aluminosilicate-rich lithium slag powder, and 16 parts of sulfoaluminate cement clinker are placed into In the planetary ball mill, the lithium slag concrete expansion agent can be obtained by ball milling for 3 minutes at a speed of 480r / min, and mixing uniformly.

[0016] The lithium slag concrete expansion agent prepared in the above Examples 1 and 2 was tested according to the GB / T 23439-2009 "Concrete Expansion Agent" standard, and the related performance indexes of the above two lithium slag concrete expansion agents were tested. The results are shown in Table 1 below. :

[0017] Table 1

[0018] Example

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PUM

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Abstract

A lithium slag expanding agent for concrete comprises following components in percentage by weight: 40 to 70% of lithium slag powder rich in sulfate, 15 to 45% of lithium slag powder rich in aluminumsilicate, and 10 to 20% of calcium sulfo-aluminate cement clinker; and is prepared by following steps: mixing the raw materials mentioned above, and ball-milling the mixture for 3 to 5 minutes in a ball milling machine. The used lithium slag powder accounts for more than 80 wt% of raw materials; the industrial solid wastes such as lithium slag generated in lepidolite extraction are fully used; theproduction cost is largely reduced, compared with a conventional concrete expanding agent preparation technology, high temperature calcining is not needed, and the technology is very simple.

Description

Technical field [0001] The invention relates to a lithium slag expansion agent for concrete. Background technique [0002] After the concrete is poured, it usually shrinks in volume during the hardening process. Along with the shrink in volume, micro-cracks are also easily generated inside the concrete, which in turn causes concrete strength, frost resistance, impermeability and Decline in durability. To deal with this problem, the most common improvement method in engineering is to mix an expansion agent into the concrete. [0003] The main raw materials of traditional calcium sulfoaluminate expansion agent (AEA) are calcium sulfoaluminate cement clinker, gypsum and alunite. It has the characteristics of good expansion performance and high stability, and is an ideal material for compensating concrete shrinkage. However, due to the non-renewability of natural resources, using industrial waste residues to replace traditional raw materials, turning waste into treasure, and realizin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14C04B22/00
CPCC04B40/0039C04B22/0006C04B22/008
Inventor 石齐揭晓东张建强柴天红习海平黄沙
Owner 江西省建材科研设计院有限公司
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