覆导电膜骨料水泥砂浆的强度与电热效应

采用聚合物树脂在石英砂表面包覆石墨制备覆导电膜骨料并以此制备导电水泥砂浆,研究了覆导电膜骨料表面形貌与试件的强度及电热性,试验表明:石墨可均匀牢固包覆于骨料表面,扫描电子显微镜显示其厚度约为10~50μm;随覆导电膜骨料掺量增加,材料电阻率大幅降低,质量分数为60%时达到渗流阈值,达到渗流阈值时覆导电膜骨料水泥砂浆中石墨质量约为水泥质量的3%;砂浆试件抗压强度达43.0MPa;覆导电膜骨料砂浆具有良好的电热效应,在25V电压下1h板面温度可达61℃.

Strength and Electro thermal Effect of Conductive Film Coated Aggregate Mortar

It is a new method to clear up road snow by using electro-thermal effect of the conductive concrete to melt ice.Conductive film coated aggregate(CFCA) was prepared by coating graphite on quartz sand with polymer resin and then conductive cement mortar was produced with those aggregates.The morphology of CFCA,mechanical and electro-thermal properties of CFCA mortar were measured.The SEM results show that the graphite can be uniformly coated on the aggregate surface,the thickness of coating is about 10~50 μm.The conductivity of the CFCA mortar reduces significantly with the increasing of CFCA.To achieve the electrical conductivity threshold,the CFA content is about 60%,which means that the graphite content in CFCA mortar is about 3%.Compressive strength of CFA mortar is 43 MPa.The temperature of the sample is up to 61 ℃ when heated 1h with AC25V-50Hz power.