Evaluating Warm Asphalt Technology as a Possible Tool for ResolvingLongitudinal Joint Problems

摘要

This paper summarizes preliminary findings from an integrated laboratory and field study that is currentlyrnunderway in the City of Hamilton to examine the impact of warm asphalt and how it can be used as arnpossible tool for examining longitudinal joint problems. It is a partnership between the City of Hamilton,rnthe Centre for Pavement and Transportation Technology located at the University of Waterloo, andrnMcAsphalt Industries. There are several reasons to consider reducing the temperature at which a hot mixrnis placed in the field. Lowering the mix temperatures could result in several construction and performancernbenefits including reduced aging of the asphalt binder, reduced fumes or odours, reduced tenderness of thernmix during compaction and reduced draindown with coarse mixes.rnA longitudinal joint is the interface that exists between two Hot Mix Asphalt (HMA) lanes that are pavedrnone after another. Premature failure of these longitudinal joints can vary from slight ravelling at the jointrnto complete erosion of the mix at the longitudinal joint leaving a large gap in the pavement.rnOverall, this paper shares some of the key findings from the initial laboratory and field evaluation. Thisrnincludes Dynamic Modulus and Resilient Modulus results observed from the laboratory prepared samples.rnIn addition, findings from the field evaluations, including longitudinal joint permeability testing andrnsurface distress surveys are presented.