Incorporation of reclaimed asphalt pavement and post-fabrication asphalt shingles in micro-surfacing mixture

The inclusion of Reclaimed Asphalt Pavement (RAP) and Recycled Asphalt Shingles (RAS) is relatively common in hot mix asphalt, but not in micro-surfacing. As of now, the micro-surfacing is composed only of virgin aggregates. In order to study the feasibility of incorporating RAP and RAS in micro-surfacing mixtures, a research project conducted at the Laboratoire sur les Chaussees et Materiaux Bitumineux (LCMB), at Ecole de technologie superieure (ETS) was done. The tests performed in the first part of the study to evaluate different properties of mixtures incorporating RAP and RAS into micro-surfacing mixtures prepared with virgin aggregates were the modified cohesion test, wet track abrasion test, and lateral/vertical displacement test. Then, the possibility of preparing micro-surfacing mixture using only RAP and RAS materials as the aggregate skeleton of the mix was studied. The results showed that it was possible to prepare micro-surfacing mixtures using 100 percent RAP materials. As for RAS, a limit of 17 percent is suggested. The results for the second part of study indicated that the maximum amount of added RAS in micro-surfacing mixture prepared using only RAP materials is 10 percent in order to respect the International Slurry Surfacing Association (ISSA) mix design standards. (A) For the covering abstract of this conference see ITRD record number 201402RT334E.