Rheological and self-healing properties of asphalt binder containing microcapsules

The objective of this investigation is to prepare the microcapsule and study the rheological and self-healing properties of asphalt containing microcapsules. Urea formaldehyde resin (UF) self-healing microcapsule was prepared by in-situ polymerization method and the monomer properties of microcapsule were characterized. Penetration, softening point, ductility, dynamic shear rheology (DSR), bending beam rheology (BBR) and self-healing tests were conducted to study the rheological property and self-healing ability of asphalt containing microcapsules. The results show that UF microcapsule material has been successfully synthesized, and the microcapsules can withstand the high temperature during the construction of asphalt pavement to a certain extent. Compared with the properties of matrix asphalt, the ductility of self-healing asphalt containing UF microcapsules decreases obviously, the softening point and rutting factor increase slightly, the durability and self-healing ability increase obviously, the low temperature crack resistance decreases slightly.