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为了明确降温速率对水泥基材料耐久性的定量影响,研究了不同降温速率两组水泥基材料(M35、M50)的变形和损伤。应用电阻式应变片测量了砂浆试件在不同降温速率下的应变变化;应用压汞法测量了材料的孔隙分布,计算了材料受冻过程的静水压力、结晶压力和有效孔隙压力,并比较损伤。研究结果表明:降温速率低,材料处于低温状态时间长,材料塑性越强,损伤越大;降温速率高,材料处于低温试件短,脆性强材料的损伤大。
In order to clarify the quantitative effect of cooling rate on the durability of cement-based materials, the deformation and damage of two cement-based materials (M35, M50) with different cooling rates were studied. The strain changes of mortar specimens under different cooling rates were measured by using the strain gauges. The pore distribution of the mortar specimens was measured by mercury intrusion method. The hydrostatic pressure, crystallization pressure and effective pore pressure were calculated and the damage . The results show that: the cooling rate is low, the material is in a low temperature state for a long time, the material plasticity is stronger and the damage is greater; the cooling rate is high, the material is at a low temperature, the specimen is short and the brittleness material is greatly damaged.