Recycled aggregate concrete and preparation method thereof

Abstract

The invention discloses recycled aggregate concrete and a preparation method thereof. The recycled aggregate concrete comprises the following raw materials by weight percent: 15 to 20 percent of cement, 5 to 15 percent of water, 15 to 25 percent of third mixed additive, 38 to 63 percent of coarse aggregate, 0.3 to 1 percent of modified wood fiber-containing polyurethane modified epoxy resin flexibilizing emulsion, 0.1 to 0.5 percent of lauryl sodium sulfate, 0.1 to 0.5 percent of sodium gluconate, 0.1 to 0.5 percent of water glass, 0.5 to 1 percent of polyacrylate, and the sum of weight percent of the raw materials is 100 percent; and the coarse aggregate is the waste concrete renewable coarse aggregate or a mixture of waste concrete renewable coarse aggregate and natural coarse aggregate. The renewable aggregate concrete has good impact resistance, earthquake resistance and crack resistance, the pressure resisting strength of the recycled aggregate concrete in 28 days can reach 80 to 100 MPa, and the recycled aggregate concrete is applicable to a load-bearing structure.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a recycled aggregate concrete and a preparation method thereof. Background technique [0002] The relationship between the quality of recycled concrete and the performance of original concrete and mortar, the damage of original concrete, the method of breaking and the composition of the new mixture have been studied at home and abroad. The quality of the recycled concrete and the quality of the interface zone, as well as the mortar content in the matrix concrete play an important role in determining the performance of recycled concrete. The strength characteristics of recycled concrete are affected by some key factors such as the strength of the matrix concrete, the ratio of coarse and fine aggregates in the matrix concrete, the ratio of the maximum particle size of the aggregate in the matrix concrete to the maximum particle size of the recycled concrete aggregate, ...

AI Technical Summary

Problems solved by technology

At the same time, the research results show that if the admixtures such as active ultrafine mineral powder and high-efficiency water reducer can be added, the recycled aggregate can be modified through a certain technical approach, and high-performance green concrete with high strength and good durability can be made. , so that it is widely used in load-bearing structures, which will have more obvious social, economic and environmental benefits. However, at present, there are few experimental studies on the seismic and impact resistance of recycled aggregate concrete load-bearing structures. Correspondingly, there is little research on recycled aggregate concrete suitable for load-bearing structures.