水饱和水泥基材料冻结损伤分析

摘要

水饱和水泥基材料冻结时孔隙内产生压力，导致孔壁开裂，是水泥基材料冻融循环劣化的原因之一。根据弹塑性力学和能量守恒原理，定量分析了冻结条件下水饱和水泥基材料内部裂缝的形成及发展，揭示了水泥基材料冻结损伤机理。%Pressure creates in saturated pores in cementitious composites when freezing and it leads to the cracking of the pore wall, which is one of the main reasons of the deterioration of cement subjected to freezing and thawing. Based on the plastoelasticity and the principle of conservation of energy, the initiation and propagation of cracks in saturated cement paste under freezing are quantitatively analyzed and the mechanical degradation in mechanical properties of the cement paste is investigated.