服役状态下混凝土渗透性的研究

Gas permeability of concrete in service

以气渗试验为基础,研究了服役状态下高性能混凝土的渗透性能。考察了轴压应力状态和非破坏震动环境对混凝土气渗系数的影响,对比了普通混凝土和钢纤维混凝土在不同服役应力阶段的抗渗性能特点,并分析了其变化规律细观机理,指出钢纤维混凝土耐久性中值得注意的问题。结果表明,服役状态下混凝土的渗透性能与常规非服役状态的渗透性能存在十分明显的差异,进行服役状态下混凝土性能数据更具可靠性,同时指出了钢纤维混凝土耐久性中值得注意的问题。

Based on gas permeability test of the concrete,the permeability of the high performance concrete in service is studied.The influence of nondestructive vibration and axial compression on the coefficient of gas permeability of concrete is investigated,the impervious characters of ordinary and steel fiber reinforced concrete and its intrinsic mechanism at the different stress stage in service are analyzed by comparison.The study results show that the permeability of concrete in service is obviously different from that not in service,the test data of permeability of concrete in service is more credible,and the aspect of the durability of steel fiber reinforced concrete should be considered.