Highways Agency Reports

Tests are described that compare the performance under accelerated trafficking of two road base materials, dense bitumen macadam and heavy duty macadam. The construction, instrumentation, and means of testing the pavements is described, and the measurements made during the test are detailed. The relative stiffnesses of the two materials was within the range normally expected, but analysis of the results shows little difference in overall performance of the early life of the pavement, heavy duty macadam has a superior performance to that of the conventional dense bitumen macadam.