电阻率用于混凝土养护状态与效率评价研究

摘要

Monitoring the state of moist curing of concrete can be carried out by measuring its electrical resistivity.The variation of electrical resistivity in the surfacial zone of concrete from the surface 1 to 5cm with different curing age and curing conditions was measured.Then the change of electrical resistivity in the surfacial zone of concrete specimen cured at different conditions for 28d,which was being immersed in water,was measured.Finally,the variation tendency of the electrical resistivity in different depth of the surfacial zone was compared and analyzed.It is shown that the difference between the average electrical resistivity in the depth of 1 to 2cm and that of 4-5cm could be used to indicate the curing state of concrete; the higher the difference,the poor the curing.The reduction of the electrical resistivity in a certain depth of concrete after immersing in water could be used to assess the curing efficiency; the higher the reduction,the lower the efficiency.%通过测量电阻率可望实现对混凝土养护过程的监测.测量不同养护条件下混凝土1～5Cm表层区域内电阻率随养护龄期的变化,然后测量不同条件养护28d的混凝土浸水后表层区域电阻率随浸水时间的变化,最后对比分析混凝土表层区域不同位置的电阻率变化规律.结果显示,采用混凝土表层1～2cm与4～5cm区域电阻率的差值可以反映混凝土养护状态,差值越大表明混凝土的养护不良;根据水分侵入条件下混凝土表层不同区域电阻率降低程度,可以判断混凝土养护效率,电阻率降低幅度大表明混凝土养护不良.