Microstructural, Mechanical, and Shrinkage Characteristics of Cement Mortar Containing Fine Reclaimed Asphalt Pavement

Abstract

The microstructural, mechanical, and shrinkage characteristics of cement mortar containing 100% fine reclaimed asphalt pavement (RAP-mortar) were revealed through an extensive experimental program in this study. The work utilized petrographic technology and isothermal microcalorimetry to investigate microstructural features and cement heat of hydration. Mechanical properties were determined, and shrinkage properties and cracking potential under restrained drying condition were characterized through the shrinkage test and a customized ring test, respectively. Despite significant strength loss and high shrinkage, the RAP-mortar exhibited higher ductility, toughness, and crack resistance compared with the plain mortar. A potential material application for the RAP-mortar could be the structures whose strength requirement is low but are vulnerable to cracking problems. The RAP-mortar material might also be used for attenuation of high energy thanks to its improved ductility and toughness.