试论升温速率对混凝土渗透性能的影响

本文进行了水泥基材料高温作用后气体渗透性的试验研究,设计了不同的升温速率,进行了普通混凝土和砂浆试样的对比试验。结果表明,当升温速率5~10℃/min时,水泥基材料的气体渗透性变化趋势不明显;当升温速率大于10℃/min时,试样的气体渗透系数大幅度增加,说明普通混凝土和砂浆试样渗透性的劣化。同时试验表明,随着围压和进气压的增大,水泥基材料的本质渗透率呈现不断下降的趋势。

Trial discussion on influence of heating rate on penetrating quality of concrete

In this paper,the gas permeability of cement-based materials after high temperature is studied,the different heating rate is designed,and the contrast test between ordinary concrete and mortar is carried out.The results show that the gas permeability of the cement-based materials does not change obviously when the heating rate is 5~10 °C / Min,and the gas permeability increases greatly when the heating rate is more than 10 °C / Min,the results show that the permeability of ordinary concrete and mortar specimens is deteriorated.At the same time,with the increase of confining pressure and air pressure,the intrinsic permeability of cement-based materials presents a decreasing trend.