Self-healing efficiency of ferrite-filled asphalt mixture after microwave irradiation
However, without the aid of external influences such as energy supply or material supplement, the self-healing ability of asphalt mixture is quite limited.
Self-healing ability increases significantly
In a paper, the efficiency of self-healing of asphalt mixture with Ni-Zn ferrite powders was analysed based on the concept of microwave heating. The recovery rate of stiffness modulus and the fatigue life extension ratio were adopted to evaluate the self-healing efficiency of asphalt mixture. Different influence factors, such as heating temperature, healing time and damage level, were analysed. The results proved that Ni-Zn ferrite powders can promote the self-healing ability of asphalt mixture significantly. It is found that when the asphalt mixture is filled with 80% ferrite powders (volume fraction of mineral powders), under the condition of healing for 3 h after heating to 55 °C by microwave, the fatigue life extension ratio of 50% damaged ferrite-filled asphalt mixture can reach 1.33.
The study is published in: Construction and Building Materials, Volume 141, 15 June 2017, Pages 12–22