AASHTO T 279-18 PDF Download

AASHTO T 279-18 is a standard method of test that focuses on the accelerated polishing of aggregates using the British wheel. This laboratory procedure is designed to estimate the extent to which different coarse aggregates may polish. The British wheel is used to simulate the polishing action that occurs on aggregates when vehicles travel on paved surfaces. By subjecting the aggregates to this accelerated polishing process, the test aims to determine their resistance to polishing and their potential for causing skid-related accidents on roads.

This standard method of test provides detailed instructions on how to perform the accelerated polishing test using the British wheel. It covers aspects such as the selection and preparation of test specimens, the operation of the British wheel equipment, and the evaluation of the results. The test results are typically expressed in terms of the polished aggregate friction value (PAFV), which indicates the aggregate's resistance to polishing. A low PAFV value suggests a higher potential for skid-related accidents, while a high PAFV value indicates a better resistance to polishing and a lower skid potential.