Strength and Electrothermal Effect of Conductive Film Coated Aggregate Mortar

Abstract:

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.

Key words:graphite; coating; mortar; resistivity; heat