水泥浆-石墨砂浆渗流结构的电导研究  

Modeling of Percolation Structure in Cement Paste Graphite Mortar by DC Electrical Conductivity

作　　者：唐国宝[1] 陈志源[1] 史美伦[1] 

机构地区：[1]同济大学混凝土材料研究国家重点实验室,上海200092

出　　处：《建筑材料学报》2000年第1期42-47,共6页Journal of Building Materials

摘　　要：采用交流阻抗谱方法,测定了以单粒级石墨为集料配制的系列硅酸盐水泥砂浆和含15%硅灰水泥砂浆的电导率.砂浆电导率与集料体积分数的关系可以用GEM方程拟合.GEM方程拟合得到的两个参数———渗流临界体积分数φhc和指数t分别为0.38和1.48～1.68.针对拟合得到的临界体积分数与按点渗流阈值所得到的临界体积分数的差异和指数的时间依赖性。AC impedance spectroscopy was used to evaluate the DC conductivity of Portland cement mortar and silica fume containing cement mortar with single sized graphite as aggregate. The experimental conductivity against aggregate volume fraction data were fitted accurately to GEM equation with two percolation morphology parameters, critical aggregate volume fraction φ hc and an exponent t , which are 0.38 and 1.48～1.68 respectively. The fitted critical volume fraction differs from that deduced from the site percolation threshold, and the exponent is hydration time dependent. It is concluded that the partial wetting of aggregate particles by cement paste and the existence of transition zone are responsible for the effect on these two GEM equation parameters.

关 键 词：砂浆 水泥砂浆-石墨砂浆 渗流 电导率 硅灰 

分 类 号：TQ177.6[化学工程—硅酸盐工业] TQ177.62