This paper examines the effects of tack coat type, tack coat application rate, and surface type (i.e., hot mix asphalt (HMA) versus Portland cement concrete (PCC)) including milled versus unmilled surfaces on the interface shear strength based on full-scale test application. To achieve this objective, four types of tack coat materials were applied at four three application rates on four different types of surfaces (existing HMA, new HMA, milled HMA, and PCC). To simulate field test conditions, cores were extracted from a full-scale test site that was designed and constructed using conventional tack coat application and paving equipment. Results of this study showed that all tack coat materials showed the highest shear strength at an application rate of 0.70 litres per square metre. A direct relationship is observed between the roughness of the existing surface and the developed shear strength at the interface. (a) For the covering entry of this conference, please see ITRD abstract no. E220164.
Samenvatting