The use of liquid anti-stripping additives (LAA) for reducing moisture damage in asphalt concrete pavements was evaluated using pavement cores from pairs of projects with-and-without LAA. Results were analyzed using the wet/dry tensile strength ratio (TSR). In addition, a diazo-dye for determining the presence and concentration of polyamine LAA was attempted to assess the value of the test as a field procedure.
The chemical additive detection tests proved inconclusive, but the TSR analysis gave a positive indication of the need for the use of LAA in the wetter environments of the state. For drier environments and for low traffic volumes, use of LAA may not be cost effective. The indirect tensile test was judged to be a potentially valuable tool for statewide use in the evaluation of anti-stripping additive needs.