STRENGTH CHARACTERISTICS OF RECLAIMED ASPHALT PAVEMENT-STONE DUST COMPOSITE BLENDED WITH FRESH BITUMEN

Abstract

ABSTRACT The recycling of asphalt has become a common practice in the transportation industry. Motivation for recycling typically includes the environmental, economic and social benefits. The use of RAP in the roadway construction fits with the global objectives of sustainable development by the prudent use of natural resources. This and other factor has attracted the attention of this research. Sieve analysis, specific gravity, bulk density were determined on both RAP and stone dust. The strength characteristics such as compaction and CBR were also carried out on the five different mixes A to E at varying percentage of bitumen content. The result shows that RAP has a uniform gradation while stone dust is medium coarse sand, the specific gravity of RAP and stone dust were found to 2.2 and 2.67 and their corresponding bulk densities were 1.19 and 1.78g/cm3.The highest MDD for 0% bitumen was 2.56g/cm3 with OMC of 8.2% and the least was 1.874g/cm3 MDD with 10.4% OMC. The highest MDD after the control was 2.53g/cm3 at 2% bitumen with 9% OMC. The minimum MDD recorded after apart from that of control was 1.876g/cm3 at 10.8% OMC also at 2% bitumen content. The maximum CBR value apart from that of control (0%) was at 1% bitumen for all different types of mixes.