Preparation method of recycled concrete

Abstract

The invention discloses a preparation method of recycled concrete, and the method comprises the following steps: pretreating: cleaning waste concrete blocks, performing hammering, removing impurities, performing primary crushing treatment, performing primary crushing and screening on the pretreated concrete blocks, screening the concrete subjected to primary crushing treatment, and obtaining concrete particles with the particle size of less than 30mm after screening; secondary crushing treatment: carrying out secondary crushing treatment and grading treatment on the concrete particles with the particle size larger than 30 mm after primary screening, separating and grading the concrete particles with the particle size smaller than 30 mm, removing micro powder with the particle size smaller than 1 mm, and mixing the materials. The preparation method of the recycled concrete can improve the performance of recycled aggregate and improve the quality of the recycled concrete; during use, the recycled concrete does not have a large number of cracks, the internal pore structure is improved, the strength is increased, and the performance is good.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a preparation method of recycled concrete. Background technique [0002] The production of cement concrete has played a positive role in promoting the rapid development of the construction industry. However, with the sharp increase in the demand for concrete and the mass production of waste concrete, the resulting resource, energy and environmental problems are also becoming more and more serious. Recycling construction waste and replacing some natural resources to produce building materials is an important way to protect the natural environment, improve the environment, and advance sustainable development. [0003] Recycled concrete refers to a new type of concrete prepared by distributing and mixing waste concrete in a certain proportion after crushing, cleaning and grading, partially or completely replacing natural aggregates such as sand and gravel, and then adding cement an...

AI Technical Summary

Problems solved by technology

The development and application of recycled concrete technology, on the one hand, can solve the problems of a large amount of waste concrete disposal and the resulting deterioration of the ecological environment. Consumption, thereby alleviating the pressure of the increasing scarcity of natural aggregates and reducing the damage to the ecological environment caused by large-scale mining of sand and gravel, so recycled concrete is a kind of green and sustainable concrete; but the strength of concrete prepared by using traditional recycled concrete preparation methods Not enough, it is easy to crack and fall off when used, it does not meet the construction standards, and there are certain safety hazards