Recycled concrete and preparation method thereof

Abstract

The invention relates to recycled concrete and a preparation method thereof, and belongs to the technical field of building material concrete. The recycled concrete is prepared from, by weight, 140-150 parts of cement, 580-590 parts of recycled coarse aggregates, 260-270 parts of recycled fine aggregates, 95-105 parts of machine-made sand, 35-45 parts of river sand, 70-80 parts of mineral additives, 15-32 parts of hybrid fibers, 4.2-4.6 parts of concrete additives and 80-90 parts of water. The preparation method includes the steps: firstly, weighing various raw materials according to formula ratio, and mixing the coarse aggregates, the recycled fine aggregates, the machine-made sand and the river sand; secondly, adding the cement, the mineral additives and the hybrid fibers, uniformly stirring mixture, adding the concrete additives and the water, and uniformly stirring mixture to obtain the recycled concrete. The recycled concrete has the advantages that natural materials are saved, and environmental protection is achieved. The prepared recycled concrete is excellent in working performance and mechanical property, stable in quality and low in cost.

Description

technical field [0001] The invention relates to the technical field of building material concrete, more specifically, it relates to a recycled concrete and a preparation method thereof. Background technique [0002] Concrete is one of the largest building materials in modern engineering structures. With the rapid development of my country's economic construction and the continuous improvement of infrastructure construction, the consumption of concrete has also increased sharply. Concrete is an engineering composite material that is bonded together by cementitious materials and aggregates. More than 2 billion tons of natural aggregates are consumed through concrete every year. The large-scale exploitation of aggregate resources will easily lead to the destruction of cultivated land, the destruction of forests, and the lack of resources. question. In order to reduce the damage to the environment and the energy consumption of mining natural sand and gravel, recycled concrete t...

AI Technical Summary

Problems solved by technology

However, recycled coarse aggregate is the main component of recycled concrete. In this scheme, various reagents such as hydrofluoric acid, urea, gel, glutaraldehyde, tetraethyl orthosilicate and surfactant are used to modify the waste concrete. In the modification process, rotary steam concentration, ball milling, freezing and other technical methods are also used, which have high requirements for equipment and high modification costs, which will lead to an increase in the cost of recycled concrete, which is not conducive to the application and promotion of recycled concrete and popularity

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