壳核导电骨料砂浆的电阻率与阻抗稳定性研究  

Study on Resistivity and Impedance of Conductive Core-Shell Aggregate(CCSA) Mortar

作　　者：张晏清[1] 李博[1] 张雄[1] 

机构地区：[1]同济大学先进土木工程材料教育部重点实验室,上海200092

出　　处：《材料导报》2013年第10期128-131,共4页Materials Reports

摘　　要：在骨料表面包覆石墨粉制备壳核导电骨料并制备导电水泥砂浆。实验表明:壳核导电骨料水泥砂浆试件的抗压强度大于45MPa,远远高于石墨导电砂浆。同时研究了壳核导电骨料砂浆的破坏机理,结果表明达到导电渗流阈值所需石墨的掺量为3%～4%。研究了掺量低于和高于纤维临界值状况下的壳核导电骨料砂浆的电阻率稳定测量方法。通过交流频谱仪测得的阻抗图谱分析,揭示了在渗流阈值前后壳核导电骨料砂浆内部的导电机理。Conductive core-shell aggregate was prepared by coating graphite powder on quartz sand, and then conductive cement mortar was produced with those aggregates. The results show that compressive strength of conduc- tive core-shell aggregate mortar was larger than 45 MPa which was obviously higher than graphite conductive mortar. The broken mechanism of conductive core-shell mortar was studied, to achieve the required electrical conductivity threshold,the graphite content only 3%--4% in conductive core-shell aggregate mortar. The mea sure method of sta- bility of resistivity of conductive core-shell aggregate mortar when the dosage below and above threshold was studied, and the internal conductive mechanism by measuring the impedance of conductive core-shell aggregate mortar was revealed.

关 键 词：石墨 壳核 导电 交流阻抗 

分 类 号：TU525.9[建筑科学—建筑技术科学]