页岩轻集料对混凝土电阻率的影响

Influence of sale light-weight aggregate on concrete resistivity

采用四电极法研究了页岩轻集料粒径、预湿时间以及掺量对混凝土电阻率的影响.研究结果表明,轻集料粒径对混凝土电阻率有明显的影响,掺陶砂混凝土电阻率要高于掺陶粒混凝土.当轻集料预湿时间为30min时,混凝土的电阻率最高,此后随预湿时间的延长混凝土电阻率逐渐降低.轻集料的掺量变化同样会对混凝土的电阻率产生明显影响,当体积取代率为30%时,混凝土电阻率达到最高值,此后随掺量的增加,混凝土电阻率呈逐步下降趋势.

The influences of particle size,pre-wetting time and content of shale light-weight aggregate（SLA） on concrete resistivity were researched by four-pole method.The results indicate that the influence of particle size on concrete resistivity is obvious,compared with coarse shale light-weight aggregate（CSLA）,fine shale light-weight aggregate（FSLA） has more obvious influence for improving concrete resistivity.When pre-wetting time reaches to 30 min,concrete has highest resistivity,then concrete resistivity reduces with pre-wetting time extends.The content of FSLA also has obvious influence on concrete resistivity,when the content of FSLA is up to 30%（by volume）,concrete resistivity reaches max value,and then concrete resistivity reduces with content increased.