Abstract
In this paper, steel slag/steel fiber composite asphalt mixture were prepared. The effects of the addition of steel slag and/or steel fibers on the mechanical, thermal, induction heating and healing properties of asphalt mixture were investigated. The results showed that adding steel slag and/or steel fibers improves the water stability, particle loss resistance and fracture energy of asphalt mixtures. The addition of steel fibers increased the thermal conductivity and thermal diffusion of the asphalt mixture, and steel slag showed a reverse effect. Steel slag asphalt mixture cooled more slowly than steel fiber asphalt mixture, which is beneficial to crack healing of asphalt mixture. The composite of steel fibers and steel slag can enhance the induction heating speed, heating homogeneity and thus enhance the induction healing ratio of asphalt mixture. It is concluded that steel slag/steel fibers composite asphalt mixture achieves good mechanical and induction healing properties.
Highlights
Asphalt concrete is a self-healing material which can close micro cracks during rest periods through bitumen flow and diffusion [1]
Marshall stability of SF, SS and SF + SS increased by 11.1%, 18.4% and 28.9% respectively. It means that adding steel fibers or steel slag can improve the high temperature property of asphalt mixture
The Marshall Stability Ratio (MSR) of SF, SS and SF + SS increased by 8.0%, 14.7% and 10.4% respectively compared with BA, which indicates that the water resistance of asphalt mixture was improved as well by the addition steel fibers or/and steel slag
Summary
Asphalt concrete is a self-healing material which can close micro cracks during rest periods through bitumen flow and diffusion [1]. The asphalt mastic containing steel fibers was heated very quickly while the mineral aggregates could not be heated [10] In such a way, the cracks within asphalt mastic can be healed quickly without affecting the stone structure. Sun et al prepared asphalt concrete by replacing mineral aggregates with steel slag and found that it can be heated at 11.6 ◦ C/min with induction heating [11]. He et al prepared asphalt mixture by adding 4% steel shots and found that its induction heating speed is 33.8 ◦ C/min [15]. Liu et al prepared conductive asphalt concrete by adding 8% steel wool fibers (by volume of bitumen) and its induction heating was 43.8 ◦ C/min [16]. The water stability, mechanical properties, thermal parameters, heating/cooling characteristics, and healing ratios of different asphalt mixtures were studied
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