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.

再生混凝土是建筑材料循环利用的产物。它具有成本低、需求量大的特点，在工程中的应用正在逐步扩大。然而，再生混凝土在寒冷地区的性能仍存在许多不明确的问题。为了解决这一问题，本文提出了再生混凝土在低温条件下的性能研究，并通过再生混凝土材料配比和试验施工设计了再生混凝土低温结构模型。根据其指标，对比分析了其低温防冻性能、抗压强度、刚度稳定性等方面的变化。对比实验结果表明，当再生混凝土的含气量逐渐降低时，保温效果降低，再生混凝土强度降低，抗冻性也降低，耐久性和稳定性差，抗冻性差。随着位移和荷载地震力的不断增加，再生混凝土的裂缝逐渐发生变化，刚度下降较快，刚度下降幅度较大，低温抗震性能较差。