Grade-C40 single-particle regenerated self-compaction concrete and preparation method thereof

Abstract

The invention discloses a Grade-C40 single-particle regenerated self-compaction concrete. The invention is characterized in that the Grade-C40 single-particle regenerated self-compaction concrete is prepared from the following raw materials in parts by weight: 1 part of cement, 0.63-1.38 parts of regenerated coarse aggregate, 0.61-1.48 parts of natural coarse aggregate, 1.71 parts of fine aggregate, 0.40 part of water, 0.03-0.07 part of additional water, 0.25 part of fly ash and 0.007-0.010 part of admixture. The water-binder ratio of the self-compaction concrete is 0.32. The flowability, filling property, segregation resistance, gradual loss and strength of the regenerated self-compaction concrete satisfy related requirements. The regenerated self-compaction concrete is convenient for construction, and lowers the production cost of the concrete. The regenerated self-compaction concrete solves the problem of treatment of construction waste, relieves the pressure of resource depletion, and is green and environment-friendly; and the preparation method is simple and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of building materials, and specifically relates to a method for preparing recycled self-compacting concrete by using waste concrete containing a small amount of broken bricks in building demolition objects as single-grain recycled coarse aggregate to replace part of natural coarse aggregate. Background technique [0002] Self-compacting concrete (Self Compacting Concrete or Self-Consolidating Concrete referred to as SCC) refers to the ability to flow and compact under its own gravity, even if there are dense steel bars, it can completely fill the formwork, while obtaining good homogeneity, and does not require additional vibrating concrete. The preparation of self-compacting concrete generally reduces the yield stress of the concrete enough to be overcome by the shear stress due to its own weight through the selection and matching of admixtures, cementing materials, coarse and fine aggregates, and careful mi...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a C40-grade single-grain grade recycled self-compacting concrete, which solves the technical problems in the prior art that self-compacting concrete requires continuously graded recycled aggregates for production, complicated procedures, and high cost of raw materials.

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