Q1. What have the authors contributed in "Crack length based healing characterisation of bitumen at different levels of cracking damage*" ?
This study aims to characterise the healing properties of asphalt binders at different damage levels. Results show that the CLbased healing index is a fundamental and accurate parameter to evaluate the healing rate and healing potential of the bitumen. Higher damage levels ( introduced by higher load levels or longer loading time ) can effectively decrease the binders ’ healing potentials when the binders are at the relatively low damaged levels. The healing potential becomes low when the material is at severe damage state, thus will remain at that low levels even though the damage level increases.