石墨碳纤维导电混凝土制备及接地特性研究

Study on Preparation and Grounding Characteristics of Graphite-carbon Fiber Electrically Conductive Concrete

选取碳纤维、石墨为导电相材料制备用于接地工程的导电混凝土,对石墨碳纤维导电混凝土的拌合工艺、配合比和接地特性进行了试验研究。结果表明,当碳纤维掺量0.6%、石墨掺量2%、单位用水量240 kg、砂率32%并采用半干拌法拌合工艺时,导电混凝土具有良好的导电性能和力学性能;混凝土电阻率随龄期增长趋于稳定,稳定值为1.62Ω·m左右,电阻率在-10～60℃范围内的变化幅度小于0.52Ω·m,随环境湿度变化电阻率的变化幅度小于0.28Ω·m,导电性能稳定;导电混凝土28 d抗压强度达到37.3 MPa,抗折强度达到5.0 MPa,满足接地材料的力学性能要求。

Carbon fiber and graphite are selected as conductive phase materials to prepare conductive concrete for grounding engineering. The mixing process, mix proportion and grounding characteristics of graphite-carbon fiber conductive concrete are experimentally studied. The results show that, when the carbon fiber content is 0.6%, the graphite content is 2%, the unit water use is 240 kg, the sand rate is 32%, and the semi-dry mixing method is adopted, the conductive concrete has good electrical conductivity and mechanical properties. The resistivity of concrete tends to be stable along with the age growth and the stable value is 1.62 Ω·m. The rangeability is less than 0.52 Ω·m when resistivity is between -10 ℃ and 60 ℃. The resistivity variation with environmental humidity change is less than 0.28 Ω·m, and the conductive performance is stable. The compressive strength of 28 d can reach 37.3 MPa and the bending strength of 28 d reaches 5.0 MPa, that can meet the requirement of mechanical properties of the grounding materials.