Influence of microcapsules on self-healing performance and road performance of dense-graded asphalt mixture

Abstract

Asphalt mixture containing microcapsules has a certain self-healing ability, which can prolong the service life of asphalt pavement. In order to study the self-healing performance and road performance of asphalt mixtures containing microcapsules, the intermittent fatigue test and split test were used to study the effect of microcapsule content on self-healing performance, and the road performance of the mixture with different microcapsule content was studied. The results show that with the increase of the amount of microcapsules, the intermittent fatigue life and SHSR of asphalt mixtures containing microcapsules increased first and then decreased, and reached the maximum when the amount of microcapsules was 6%. The low-temperature bending strain of the mixture increased, while the dynamic stability (DS) and TSR decreased. Considering the change law of self-healing performance and road performance, the recommended content range of microcapsules was 4%-6%.