Self-compacting micro-expansive C55 concrete

Abstract

The invention belongs to the technical field of resource utilization of solid waste, and aims at providing the self-compacting micro-expansive C55 concrete. To achieve the technical purpose, according to the technical scheme, the self-compacting micro-expansive C55 concrete is prepared from, by weight, 150-174 parts of finely-ground desulfuration residues, 350-406 parts of cement, 750-800 parts of river sand, 850-900 parts of crushed stone, 150-174 parts of water, 7.5-8.7 parts of activator and 7.0-8.1 parts of water reducing agent; the finely-ground desulfuration residues and the cement are binding materials, the total weight ratio of the activator to the cementing materials is 1.5%, the total weight ratio of the water reducing agent to the cementing materials is 1.4%, and the finely-ground desulfuration residues are prepared by grinding coal gangue desulfuration residues with a ball grinding mill and then sifting the coal gangue desulphurization residues with a 80-micrometer square hole sieve; the specific surface area of the finely-ground desulfuration residues is no less than 390 m<2>/kg; the C55 concrete has the advantages of being high in strength, self-compacting and micro-expansive, and can be widely applied to the field of construction.

Description

technical field [0001] The invention relates to a concrete, in particular to a self-compacting micro-expansion C55 concrete, which belongs to the technical field of solid waste resource utilization. Background technique [0002] Coal gangue is a kind of black rock with low carbon content associated with coal during the coal formation process, and it is a solid waste produced in the process of coal mining and washing. At present, the amount of gangue discharged from coal mines accounts for about 8%-20% of the amount of coal mining, with an average of about 12%. Coal gangue contains calorific value components such as carbon, hydrogen, and oxygen. Using coal gangue to generate electricity is an important way for comprehensive utilization of coal gangue. In order to promote energy saving and emission reduction, and encourage the utilization of coal gangue, the state has issued relevant policies specifically for coal gangue power generation, and promoted the construction of a la...

AI Technical Summary

Problems solved by technology

At present, the utilization rate of CFB coal gangue desulfurization slag is very low. The idle stacking of a large amount of CFB coal gangue desulfurization slag will not only occupy a large amount of land, but also cause environmental pollution.

Using CFB coal gangue desulfurization slag to replace cement to prepare high-performance concrete can save cement while digesting and utilizing waste slag, which has great practical significance and economic value, but there are few related research reports in the prior art

[0003] On the other hand, the prepared concrete in the prior art still has certain defects

First of all, the conventional method of preparing expansive concrete is to provide an expansion source by adding expansion agent or expansion cement. Although it can compensate for shrinkage or generate self-stress, there are problems of decreased strength in the later period and poor long-term stability.

Secondly, ordinary concrete does not have a self-compacting effect, and it needs to be vibrated when it is used in construction

This not only consumes manpower and financial resources, but the noise generated makes it impossible to carry out night construction and affects the construction progress

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