Freeze-thaw resistant recycled concrete and preparation method thereof

Abstract

The invention relates to the field of concrete, and particularly discloses freeze-thaw resistant recycled concrete and a preparation method thereof. The freeze-thaw resistant recycled concrete is prepared from the following raw materials in parts by weight: 300 to 400 parts of cement, 250 to 300 parts of modified recycled coarse aggregate, 150 to 200 parts of superfine slag powder, 100 to 150 parts of water, 150 to 200 parts of fly ash, 100 to 150 parts of silica fume, 20 to 30 parts of an air entraining agent, 20 to 25 parts of a water reducing agent and 20 to 30 parts of polyacrylamide. The preparation method comprises the following steps of: uniformly stirring the cement, the modified recycled coarse aggregate, the superfine slag powder, the fly ash, the silica fume, the air entraining agent, the water reducing agent and the water, adding the uniformly mixed modified recycled coarse aggregate and polyacrylamide, and uniformly stirring to obtain the recycled concrete. According to the recycled concrete, the porosity of the recycled concrete can be reduced, the water absorption is reduced, and the freeze-thaw resistance of the recycled concrete is improved.

Description

technical field [0001] The application relates to the field of concrete, more specifically, it relates to a freeze-thaw resistant recycled concrete and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy, the accelerated construction of urban infrastructure, the increased demand for building materials such as concrete, the huge consumption of sand, gravel, cement and other resources, and the demand for these resources is still in a state of rapid increase, causing serious damage to the ecological environment. The adverse effects of irreversible damage will continue to develop. In the construction of infrastructure, a large amount of construction waste concrete is also produced. Therefore, in order to alleviate the increasingly scarce raw material resources of cement concrete and solve a series of environmental and social problems caused by the sharp increase in waste concrete, people pay attention to waste. Concrete ...

AI Technical Summary

Problems solved by technology

[0004] At present, due to the characteristics of high water absorption and large porosity of recycled coarse aggregate, the freeze-thaw resistance of the concrete configured with it is often not ideal.