Test Methods and Specifications

Polymer modified binders (PMBs) are prepared from mixtures of polymers, additives and bitumen selected to achieve their required properties. Some of these binder systems can segregate leading to variations in measured properties and in some instances significant reductions in desired field performance.

This test method provides a measure of a PMBs tendency to segregate after sustained storage at high temperatures. It involves placing a sample of the PMB into an oven at an elevated temperature and, after a prescribed time, measuring the softening points of the top and bottom halves of the sample.