Evaluation of procedures for analyzing the durability of porous friction courses for road surfaces
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The durability of porous friction courses (PFC) is an important aspect to consider in the design of this type of hot-mix asphalt (HMA). Currently various highways authorities design such mixtures chiefly on the basis of determining their volumetric properties. But though this approach ensures that the mixture works appropriately, it does not guarantee durability. This study evaluates three tests (the Cntabro wear test [Cntabro] the Hamburg Wheel Tracking Test [HWTT], and the Overlay Test [OT]) regarded as possible procedures for evaluating PFC durability. This evaluation is based on a laboratory programme including two mixing systems involving two different binders (76-22 Performance Grade [PG] and Asphalt Rubber [AR]), with their corresponding gradings and compositions. It also includes a comparison of the performance of the mixtures manufactured. The Cntabro test is recommended, due to its lesser variability in comparison with the HWTT the OT, as an analytical tool for selecting the combination of materials to be included in the pertormance of more advanced tests for the selection of optimum asphalt content (OAC) Presented at the 87 Annual Meeting of the Transportation Research Board, January 15, 2008, Washington D.C. Translated and printed with permission of TRB. TRB is not responsible for the translation.
