Abstract
It is consensual that the self-healing property of asphalt concrete can repair the damage inside it during high temperature and rest period. In order to not affect the traffic, the rest period of asphalt pavement is very short and uncontrollable; so, it is necessary to obtain enough high temperature in a limited time to achieve higher healing efficiency of asphalt concrete. The purpose of this paper is to study the induction heating efficiency and healing behaviors of asphalt concretes doped with different conductive additives. Steel fiber, steel grit, and steel slag were added to asphalt mixtures as conductive additives to prepare induction healing asphalt concretes. The steel grit and steel slag were added to replace the aggregates of corresponding particle size by equal volume to ensure the consistency of asphalt concrete volume, which can avoid degrading the performance of asphalt concrete due to the change of porosity. The induction heating efficiency and healing rate of asphalt concrete were quantified by infrared camera and three-point bending-healing experiment, respectively. The results showed that the thermal properties of asphalt concrete changed with the addition of different conductive additives. The asphalt concrete with steel fiber had the best induction heating property. While steel slag had extremely weak induction heating speed, the better thermal insulation property of the asphalt concrete with steel slag resulted in a higher induction healing rate. It was suggested to add steel slag to induction healing asphalt concrete to improve the healing rate.
Highlights
Asphalt concrete pavement has attracted more and more attention because of its excellent service performance [1,2,3,4,5]
It was analyzed in turn how the thermal constants of asphalt concrete changed with the addition of steel fiber, steel grit, and steel slag
Based on the results discussed above, the following conclusions could be drawn: (1) e addition of steel ber and steel grit made asphalt concretes obtain better thermal conductivity, and the addition of steel slag improved the heat storage performance of asphalt concretes, which was benecial to induction healing
Summary
Asphalt concrete pavement has attracted more and more attention because of its excellent service performance [1,2,3,4,5]. Due to environmental and human factors, such as temperature [6], moisture [7], ultraviolet rays [8], and heavy load [9], it is often difficult for the service life of the asphalt concrete pavement to reach the design life. Macroscopic distresses, such as potholes, cracks, and ruts, are often caused by microdamage inside asphalt concrete [10, 11]. It will take longer time to transfer the temperature from the asphalt binder to the whole asphalt concrete,
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