电磁屏蔽石墨混凝土电导率实验研究  

Experimental Study on Conductance of Electromagnetic Shielding Graphite Concrete

作　　者：康青[1] 姜双斌[2] 

机构地区：[1]后勤工程学院军事建筑工程系,重庆400041 [2]后勤工程学院科研部,重庆400016

出　　处：《后勤工程学院学报》2006年第4期25-28,共4页Journal of Logistical Engineering University

摘　　要：石墨混凝土具有耐酸碱、成本低、性能稳定等优点。针对电导率是材料电磁屏蔽性能的重要影响参数，以获得最佳导电性能为方向设计了石墨混凝土的探索性制备方案，研究了其配合比对混凝土电导率性能的影响，采用四针电极法考察石墨混凝土的导电性能。实验结果表明，石墨混凝土中电导率存在不均匀性，其中粗颗粒石墨混凝土比细颗粒石墨混凝土具有更好的导电性能，其值约0．8S／cm，表现出较好的性能一致性，为工程应用提供了条件。增加20％导电镍粉，对导电性能有改善，但水灰比较大。掺碳纤维石墨混凝土样品，针对石墨质量分数71％，相对石墨掺入碳纤维2％，电导率值由0．8S／cm降为0．17S／cm。其中材料的多孔性是材料导电性降低的主要因素。Graphite concrete has the advantages of acid and alkali resistance, low cost and performance stability, Aimed at best conductance, a series of experiments of conduct graphite concrete are designed. The effect of ratio to its conduct property is studied. Four - pin electrode method is adopted to view conductance of graphite concrete. The experimental result shows that asymmetry exists in conductance of graphite concrete. Coarse graphite concrete conduces a better conductance than fine graphite concrete, the conductance is about 0.8 S/cm, puts up a good consistence of conductance, and offers a condition for engineering application. With 20% electric Ni powder added, the conductance is improved, but more water is needed. Adding 2% carbon fibre to graphite content, whose weight fraction is 71%, the conductance is dropped from 0.8 S/cm to 0.17 S/cm. The porosity is the chief factor for the depress.

关 键 词：电磁屏蔽 石墨 混凝土 电导率 

分 类 号：TU528[建筑科学—建筑技术科学]