“刚性防水和混凝土结构自防水”系列报道之十六 高温损伤及冷却方式对混凝土结构渗透性影响研究

Study on Influence of High Temperature Damage and Cooling Mode on Permeability of Concrete Structure

在不同温度损伤环境、不同冷却方式下,通过毛细吸收试验测定不同混凝土试件的毛细吸水量与毛细吸水系数的变化,定量地研究温度损伤与冷却方式对混凝土渗透性的影响。试验结果表明,高温损伤加速了混凝土结构的劣化速率;高温损伤后,喷水冷却混凝土试块的毛细吸收系数大于自然冷却的混凝土试块;在一定程度上,喷水冷却混凝土对距表层一定厚度范围内的混凝土造成二次劣化作用。

Influence of high temperature damage and cooling mode on permeability of concrete is quantitatively studied under different temperatures and cooling modes, by capillary absorption tests which detect capillary water absorption and capillary water absorption coefficient of different concrete samples. The results show that high temperature damage accelerates deterioration rate of concrete structure; capillary water absorption coefficient of concrete samples cooled by spraying is higher than that of samples coo｜ed naturally after high temperature damage; spraying will cause twice deterioration to a certain extent to concrete which is a certain thickness from the surface.