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Monday, 16 September 2019
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Raw materials & technologies, Technologies

Self-healing efficiency of ferrite-filled asphalt mixture after microwave irradiation

Friday, 31 March 2017

Asphalt-based composites have the ability to heal themselves. Under certain conditions, strength and stiffness modulus can be restored so that the fatigue life can be extended.

Self-healing efficiency of ferrite-filled asphalt mixture after microwave irradiation. Source: pixabay.com/CCO

Self-healing efficiency of ferrite-filled asphalt mixture after microwave irradiation. Source: pixabay.com/CCO

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

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