PREDICTED THE PULL OFF TENSILE STRENGTH OF ASPHALT BINDER USING MODIFIED BBS TEST

Abstract

Affinity is a term used to describe the amount of the adhesion bond between asphalt binder and aggregate. Adhesion force may be used as indicator to the amount of energy or work required to breakdown the adhesive bond between asphalt binder and aggregate. Four types of aggregate brought from various regions of Iraq to study of affinity between asphalt binder and these aggregate; taking into consideration mineral composition in order to measured required force to separate asphalt binder from aggregate. Standard and modified device are manufacture locally to obtained more accurate and realistic experimental result. the Pull Off Tensile Strength of aggregate type S5 brought from Diyala was greater than other types of aggregate for dry and wet test condition and different stub (standard and modified). Also had less Pull off Tensile Strength Losses than other types due to increased present of calcite and high pore size with high stiffness of aggregate.