The penetrating restoration mechanism of reactive polymer on slight crack of asphalt pavement

To explore the penetrating restoration mechanism of reactive polymer on slight crack (<3 mm) of asphalt pavement, based on the self-developed reactive MMA material, through the combination of viscosity control and micro-analysis methods, the penetration depth of different viscosities of binding materials to micro-crack and microstructure of the preventive maintenance interface were studied. The results show that the penetration depth of the binding material to the micro-crack is positively correlated with the viscosity of the material, and the restoration effect of the micro-crack depends on the fullness of the filling and curing state of the material in the crack. When the filler content is 20%, the penetration depth of the binding material to the micro-crack can reach 1 mm. The penetration depth can be changed through viscosity control, and a full-continuous restoration structure can be obtained. The microstructure of the micro-crack restoration area shows that the penetration enhancement of the polymer seal material to the micro-crack in the pavement includes three processes: penetration, filling, and curing.