重复载荷作用下矿渣混凝土的渗透性

采用WHY系列全自动应力试验机对混凝土试件施加最大载荷为0.4fcy(轴压强度)和0.8fcy重复5次载荷.混凝土卸载后,通过测定混凝土加速氯离子渗透实验中阳极溶液的氯离子浓度,分析磨细矿渣掺量、载荷和渗透时间的关系.氯离子渗透经过非线性阶段后,阳极溶液中氯离子浓度随时间延长呈线性增加.结果表明:施加最大载荷为0.4fcy重复5次的压应力后,不同配比混凝土渗透性均比相应未加载混凝土大;最大载荷提高到0.8fcy后,混凝土氯离子渗透性均进一步增大.掺入磨细矿渣可抑制载荷对混凝土渗透性的增大作用,矿渣掺量不超过30%时,掺量越大抑制作用越明显,掺量为40%时,抑制作用有所降低.

Permeability of slag concrete under repeated loading

Repeated loading five times was applied to concrete specimens using WHY series full automatic testing machine,the maximum loading was 0.4 fcy(axial compressive strength)and 0.8 fcy.In order to analyze the relationship between slag replacement,loading,and permeation time,the chloride ion concentration in anode chamber was measured during the accelerated chloride permeation test of concrete after unloading.The chloride ion concentration in the anode chamber was linear with respect to time after a stage time.The results show that,in the case of 0.4 fcy,the permeability of concrete increases significantly.The permeability of concrete has a further increment when the stress level rises from 0.4 fcy to 0.8 fcy.Adding ground slag in concrete can inhibit the increment of concrete permeability due to the loading.The inhibition increases with the replacement of ground slag when the replacement is no more than 30%,while the inhibition decreases when the replacement is 40%.