Influence of microcapsules on rheological properties of asphalt mortar

Abstract

In order to study the effect of microcapsules on the rheological properties of asphalt mortar, microcapsules were prepared by interfacial polymerization and mixed with 70# matrix asphalt and SBS modified asphalt in different proportions to prepare two kinds of microcapsule asphalt mortars. The rheological properties of asphalt mortar were measured by dynamic shear rheological experiment and curved beam rheological experiment. The test results show that the microcapsules prepared by the interfacial polymerization method have a smooth surface, a high coating rate, and an average particle size of about 14.3μm; in the high temperature rheological properties, the rutting factor of the two asphalt mortars showed varying degrees of reduction with the increase of the microcapsule content. When the content of microcapsules is greater than 0.6%, the high temperature rheological properties of the microcapsule asphalt mortar do not change significantly; in the low temperature rheological properties, the creep stiffness modulus S gradually decreases with the increase of the microcapsule content, and the creep rate m gradually increases with the increase of the microcapsule content.