Preparation method for high-strength self-compacting concrete with recycled fine aggregate

Abstract

The invention discloses a preparation method for high-strength self-compacting concrete with recycled fine aggregate. The preparation method comprises the following steps: mixing recycled fine aggregate with required saturated water, stirring the mixture to be uniform, adding and mixing cement, a mineral admixture, natural aggregate, 50-70 % of mixing water and a polycarboxylate superplasticizer, stirring the mixture to be uniform, and finally adding the remaining mixing water to the mixture to be mixed uniformly. According to the preparation method, the problem that the concrete slump loss is large, which is caused by the fact that recycled fine aggregate has the characteristics of higher water absorption, poor strength, irregular shape and the like, is solved, and almost no loss is caused within 2 h, so that the preparation method has wide applicability, and the problem that new mixed concrete is poor in working performance and the like in the actual construction process can be solved. The ratio and the production technology process of the high-strength self-compacting concrete with recycled fine aggregate are optimized; by changing the ratio of mineral admixture and the stirring manners as well as optimizing a recycled fine aggregate demand water saturation process and a mixing water adding process, the new mixed concrete can be excellent in working performance, the slump loss is obviously reduced, the pumpability is excellent and the construction is facilitated.

Description

technical field [0001] The invention relates to the technical field of cement concrete preparation, in particular to a preparation method of recycled fine aggregate high-strength self-compacting concrete. Background technique [0002] The development and utilization of waste concrete as recycled aggregates, on the one hand, solves the problems of the difficulty in handling a large amount of waste concrete and the resulting deterioration of the ecological environment; on the other hand, it can reduce the consumption of natural aggregates in the construction industry, thereby reducing the need for The mining of aggregate stone fundamentally solves the problem of the increasing shortage of natural aggregate and the damage to the ecological environment caused by the mining of a large amount of sand and gravel, and the comprehensive benefits are remarkable. [0003] At present, most of the applications of recycled aggregates are concentrated in backfill, foundation, pavement base...

AI Technical Summary

Problems solved by technology

The research has confirmed that it is feasible to prepare self-compacting concrete with recycled fine aggregate, but the workability of self-compacting concrete prepared by this method is average, and the effect of the amount of recycled fine aggregate on the slump loss of concrete has not been systematically studied; and through this method The compressive strength of prepared self-compacting concrete cannot meet the requirements of high-strength concrete

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