Abstract
Conductive asphalt concrete can eliminate snow and icing on road areas, and is a research hot topic for intelligent snow removal. By adding graphite, the electrical resistivity of asphalt concrete can be reduced to achieve the purpose of electrical conductivity. However, the aggregate electrical resistance in asphalt concrete is very large and does not play a conductive role. It is a new technical idea to use steel slag with good electrical conductivity as aggregate to mix graphite powder with good electrical conductivity to prepare steel slag graphite conductive asphalt concrete (SGCAC). In this paper, the effects of steel slag and graphite on the conductive properties of steel slag graphite conductive asphalt concrete are separately explained, and then the conductive mechanism and electrical resistance stability of the conductive slag and graphite are studied.
Highlights
After snowfall in winter in high and cold areas, roads are prone to snow or icing, which brings huge safety risks to transportation, affects people's safe travel, and even causes the entire transportation network to be paralyzed
Where δ - the electrical conductivity of the asphalt concrete; L - the side length of the cube specimen; d - the diameter of graphite particles; Vf - the volume fraction of graphite; R0 - the contact electrical resistance. It can be seen from the formula that the particle size of graphite, the content of graphite, and the contact electrical resistance are important factors that determine the resistivity of conductive asphalt concrete
Many studies have shown that slag graphite conductive asphalt concrete (SGCAC) has good electrical resistance stability [11,12], and the purpose of melting snow and icing can be achieved after being energized
Summary
After snowfall in winter in high and cold areas, roads are prone to snow or icing, which brings huge safety risks to transportation, affects people's safe travel, and even causes the entire transportation network to be paralyzed. The most commonly used snow removal method at home and abroad is to spray deicing salt, but a large amount of spraying deicing salt will cause erosion of the road surface and greatly reduce its service life. People began to explore automatic snow removal methods, by heating the road surface and making it warm, to achieve the purpose of melting snow and icing. The research on automatic snow removal methods mainly includes ground pipe heating method, new solar heat pipe method, infrared lamp heating method, and conductive concrete. In. 1971, the Soviet Union achieved an ideal deicing effect by mixing 22% by volume of graphite in conductive asphalt as a conductive material [1].At present, the research of conductive asphalt concrete mainly forms conductive network in concrete by adding conductive phase material to cementitious materials. In order to solve this problem, it is necessary to find a material that has both good mechanical properties and excellent electrical conductivity
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