Self-compacting concrete

Abstract

The invention relates to self-compacting concrete which is used for overcoming the contradiction between flowability and stability, early strength and delayed coagulation, contraction and expansion and the like of the self-compacting concrete in the prior art. In the invention, by means of combination of an aliphatic (hydroxyl) sulfonate superplasticizer and a polycarboxylic acid superplasticizer, selection and collocation of a cementing material and coarse and fine aggregates as well as specific mix design, the self-compacting concrete (more than C40) with low consumption of the cementing material is prepared from coal ash, mineral powder and tailings, wherein, a ketoaldehyde condensate is taken as the main component of the aliphatic (hydroxyl) sulfonate superplasticizer; and when the superplasticizer is added to cement paste, the mixed concrete has the advantages of good construction workability, less possibility of bleeding and segregation, no crystallization precipitate at low temperature and the like. Compared with the prior art, the self-compacting concrete prepared by the method provided by the invention has the advantages of lowering cement consumption by at least 70kg / m<3>, reducing consumption of the cementing material by at least 70kg / m<3>, comprehensively utilizing at least 470kg / m<3> of solid waste, and lowering concrete cost by at least **yuan / m<3>.

Description

technical field [0001] The invention relates to a kind of self-compacting concrete, in particular to a kind of self-compacting concrete with C40 or above low-glue material prepared by substituting ultra-fine tailings sand for part of the cementitious material. Background technique [0002] Self-compacting concrete is a new material and technology that appeared internationally in the early 1980s. Self-compacting concrete is characterized by good fluidity and self-compacting under its own weight; good uniformity and stability, no bleeding and no foaming in a fluid state; good volume stability after hardening, no Shrinkage cracks; longer initial setting time, shorter final setting time, high early strength; smooth surface, good wear resistance; strong adhesion to base materials; used for pumping construction can save labor and construction costs, Improve construction efficiency and quality, and speed up project progress. [0003] Self-compacting concrete is prepared from a mi...

AI Technical Summary

Problems solved by technology

Tailings account for about 1 / 3 of the country's solid waste, but the comprehensive utilization rate of tailings is only about 8.2%. Tailings are discharged into rivers, valleys, and lowlands, polluting water, soil and atmosphere, damaging the environment, and even causing disasters

The mine tailings storage site also occupies a large amount of farmland and forest land, which also pollutes the environment to a certain extent.

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