摘要
混凝土介质的抗渗性是其耐久性的一个重要方面。通过试验,揭示了混凝土试件的渗透率在围压升降循环过程中的变化特性,获得了混凝土试件在相同渗压、不同围压作用下的渗透率特征曲线,以及在围压升降过程中混凝土试件渗透率的变化曲线。试验结果表明:混凝土试件的渗透率变化与围压的变化呈负指数关系;在围压升降循环过程中,低围压阶段混凝土试件的渗透率对围压改变的敏感性大于高围压阶段;在不同的围压升降循环过程中,试件的渗透率具有不同的恢复率;在围压升降过程中,混凝土渗透率的变化具有一定不可逆性。
The behavior of concrete permeability is closely related to its durability.Based on permeability test,we investigated the variation characteristics of concrete permeability under cycle change of confining pressure and obtained the characteristic curves of permeability of concrete specimens under the same seepage pressure and the different confining pressures,as well as the variation curve of permeability under cycle confining pressure.The results show that the permeability of the concrete changes in a negative exponential way with the change of confining pressure;in a cycle change of confining pressure,the sensibility of concrete permeability to confining pressure in low confining pressure stage is larger than that in high confining pressure stage;the restoration rate of permeability of concrete specimens differs during different confining pressure cycles;the variation of concrete permeability shows irreversibility at some extent during a confining pressure cycle.
出处
《人民长江》
北大核心
2011年第24期58-60,72,共4页
Yangtze River
关键词
围压
升降循环
渗透率
混凝土材料
confining pressure
descent-ascend cycle
permeability
concrete material
