Enhancing Shear Strength of Bonding Materials Used for Asphalt Concrete and Composite Pavement Layers

A tack coat is a thin cut-back cement or asphalt emulsion coating applied on an existing non-absorbent pavement. good bonding between the and concrete necessary to provide sufficient structural strength. Poor adhesion will result in shear failure. The test one of basic tests determine bond This study aims quantify best resistance obtained using three types asphalts (RC70, RC800 modified with polymer 4.5% MC70), PG (76-10) 4.5%, Sikadur®-31 CF usage at elevated temperatures +25°C +45°C Nitomortar TC2000 epoxy from Fosrok company. All are surfaces application rate 0.5kg/m2 except for Nitomortar, which depends layer thickness ranges (1-2.5) mm instead rate. special attachment loading mechanism were designed facilitate measurement asphalt-to-concrete contact strength Al-Ahmad Lab-Baghdad. Vertical force multiple-layer sample 0.25 kN/sec until failure occurs interface. final this stated terms maximal power needed break bond. average materials (0.049, 0.0455, 0.0085, 0.677, 1.088, 1.361) MPa Respectively. It concluded that has maximum Also, adding increased viscosity. used enhanced composite pavement layers