Study on low temperature performance of recycled concrete

Recycled concrete is a product of the recycling of building materials. It has the characteristics of low cost and large demand, and its application in engineering is gradually expanding. However, there are still many unclear problems in the performance of recycled concrete in cold regions. In order to solve this problem, this paper puts forward the performance research of recycled concrete under low temperature condition, and designs the recycled concrete low temperature structure model through the ratio of recycled concrete materials and experimental construction. According to its indexes, the changes of its cryogenic antifreeze performance, compressive strength, stiffness stability and other aspects are compared and analyzed. The comparative experimental results show that when the air content of recycled concrete is gradually reduced, the insulation effect is reduced, the strength of recycled concrete is reduced, the frost resistance is also reduced, the durability and stability is poor, and the frost resistance is poor. With the continuous increase of displacement and load seismic force, the crack of recycled concrete gradually changes, the stiffness decreases faster, the stiffness degrades to a greater extent, and the low temperature seismic performance is poor.