A self-compacting micro-expansion c60 high performance concrete

Abstract

The invention discloses a self-compaction and micro-expansion C60 high-performance concrete, and belongs to the technical field of solid waste recycling. A technical problem to be solved in the invention is to provide the self-compaction and micro-expansion C60 high-performance concrete. A technical scheme adopted to solve the technical problem is characterized in that the self-compaction and micro-expansion C60 high-performance concrete comprises, by weight, 150-174 parts of finely ground desulfurization slag, 350-406 parts of cement, 750-800 parts of river sands, 850-900 parts of gravel, 150-174 parts of water and 7.5-8.7 parts of a water reducer; the finely ground desulfurization slag and the cement are cementing materials, and the water reducer accounts for 1.5% of the total weight of the cementing materials; the finely ground desulfurization slag is produced through grinding coal gangue desulfurization slag by a ball mill and sieving the ground desulfurization slag by a 80 [mu]m square hole sieve; and the specific surface area of the ground desulfurization slag is not less than 600 m<2> / kg. The C60 high-performance concrete has the advantages of high strength, self-compaction and micro-expansion, and can be widely used in the field of construction.

Description

technical field [0001] The invention relates to a concrete, in particular to a self-compacting micro-expansion C60 high-performance 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 con...

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, 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

Finally, ordinary concrete cannot meet the advantages of high performance and low cost at the same time

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