Characterization of soil mixed with reclaimed asphalt pavement waste for road shoulder

Abstract

The usage of fresh bitumen and aggregates in pavement construction and rehabilitation can be minimised by utilising reclaimed asphalt pavement (RAP). RAP is a waste material generated from the old or damaged pavement surface. Although it has been practiced since the 1970s while several suggestions on the usage of RAP in the new mixture have been introduced, there are a limited number of studies found. It is also cost-effective and sustainable for the environment because the materials used are recycled materials. This research is about the characterization of soil mixed with reclaimed asphalt pavement (RAP) for the local road shoulder. RAP is one of the rehabilitation methods to replace the existing surface of deterioration where the upper pavement was later removed and replaced with the new pavement. From previous research, if soil is mixed with the other materials, it will improve the finding. In this research, the objectives are to determine the material properties of soil and RAP, investigate the optimum moisture content of material and degree of compaction for road shoulder and investigate the optimum mix proportion of soil and RAP under the California Bearing Ratio (CBR) test for road shoulder. The sample of soil and RAP has been tested Atterberg limit, liquid limit and plastic limit for soil. Sieve analysis for soil and RAP. Compaction test for soil and CBR test for soil and RAP were conducted with mixed proportion of 10S, 2S8RAP, 4S6RAP, 6S4RAP, 8S2RAP and 10RAP. The finding from the laboratory test, 20% of RAP (8S2RAP) showed the better mixed proportion for road shoulder. Therefore reuse material such as RAP can be used as a road shoulder material for road construction.