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.
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
关键词
电磁屏蔽
石墨
混凝土
电导率
electromagnetic shielding
graphite
concrete
conductance
