Abstract
Induction healing is a proven technology which is able to improve the self-healing capacity of asphalt concrete. Healing is achieved via electromagnetic current produced by passing induction machine, where steel asphalt constituents heat up which in turn soften the bitumen in the asphalt layer, allowing it to flow and close cracks, repairing the damage. This paper reports on the study which investigated the influence of ageing on the healing capacity of Porous Asphalt (PA) concrete. Porous Asphalt concrete mix was prepared first, then subjected to an accelerated (laboratory) ageing process using a ventilated oven. In order to further evaluate the induction healing efficiency of asphalt concrete, Semi-circular bending (SCB) and healing cycles were performed on asphalt concrete specimens. The results show that with an increase of the ageing level of porous asphalt concrete, the induction healing efficiency decreases.
Highlights
Asphalt concrete when subjected to loading and environmental conditions leads to deterioration to its physical and mechanical properties, such as ageing [1,2,3]
That is due to the density of the steel fibres is 7.5 kg/m3, which is significantly higher than aggregates and asphalt mastic (
This study investigated the effect of asphalt ageing on induction healing, the following conclusions are drawn:
Summary
Asphalt concrete when subjected to loading and environmental (ultraviolet radiation, oxidation and moisture damage) conditions leads to deterioration to its physical and mechanical properties, such as ageing [1,2,3]. The ageing of asphalt involves synergy of several effects, such as: volatilisation, oxidation and steric hardening [3]. The volatilisation and oxidation result from the change in molecular structure, while steric hardening is a result of a molecular rearrangement [3]. In mechanical way, ageing of asphalt increases the stiffness and bitumen viscosity and eventually leads to ravelling and cracking in asphalt concrete [4,5,6]. A higher temperature or longer exposure period increase the asphalt ageing level, which changes the rheology of asphalt binder and reduces its ability to flow
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