Construction waste recycled concrete and preparing method thereof

Abstract

The invention relates to the technical field of building materials, in particular to construction waste recycled concrete and a preparing method thereof. The construction waste recycled concrete is prepared from, by weight, 225-350 parts of P O42.5 cement, 85-95 parts of II-class coal ash, 0-85 parts of S95 mineral powder, 658-1047 parts of natural fine aggregate, 741-988 parts of recycled coarse aggregate, 9-10.5 parts of an additive and 160-192 parts of water, wherein the fineness modulus of the natural fine aggregate is 2.6, and the granularity of the recycled coarse aggregate is 5-31.5 mm. On the basis of an equal mortar volume method (namely EMV method), by establishing a residual mortar volume replacement formula and analyzing and comparing physical performance of the raw materials, through a large number of creative experimental data, the most practical recycled concrete mix proportion is obtained, the quality performance of the recycled concrete is improved, and meanwhile the actual engineering application requirement is met.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a construction waste recycled concrete and a preparation method thereof. Background technique [0002] Recycled concrete is a kind of concrete prepared by partially or completely replacing natural aggregates with recycled aggregates obtained from waste concrete after cleaning, crushing, grading, and matching with each other in a certain proportion. Performance adjustment is carried out to improve the strength of recycled concrete, so that it has good mechanical properties and durability after hardening. The application of recycled aggregates is conducive to reducing the use and development of natural aggregates and enabling limited resources to be recycled. [0003] The traditional method of preparing recycled concrete is mainly to regard recycled aggregate as a homogeneous overall material, and use recycled aggregate to replace natural aggregate by equal volume or eq...

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Problems solved by technology

[0003] The traditional method of preparing recycled concrete is mainly to regard recycled aggregate as a homogeneous overall material, and use recycled aggregate to replace natural aggregate by equal volume or equal quality; since recycled aggregate is composed of natural aggregate and its surface adhesion The mortar composition simply replaces natural aggregates, and the total volume of mortar in recycled concrete is too large, resulting in a decrease in elastic modulus. Moreover, due to the different sources and processing methods of recycled aggregates, there are differences in their quality and surface mortar content. Make the dispersion of recycled concrete strength too large

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