ABSTRACT
Recycling of pavement material has become a viable alternative in road maintenance and rehabilitation. This paper presents the result of a laboratory evaluation of RAP-virgin aggregate at different percentage in asphalt concrete mixture (ACB14). To identify the suitability of RAP as a material in pavement, a few physical tests were implemented on the RAP and the aggregate sizes refer to the Standard Specification of Road Works (JKR, 1988). The indirect Tensile test was capable to determine the Resilient Modulus of samples by using Universal Asphalt Testing Machine (UTM). The Indirect Tensile Test were based on the temperature (25° and 35°). The test was conducted on the following RAP/virgin aggregate mixture: 0/100, 15/85, 30/65, 45/55 and 60/40%. The preliminary testing on RAP indicated that the materials are suitable and appropriate to be an aggregate replacement which has a low specific gravity and fulfill all the coarse aggregate requirement. Different percentage of RAP in the mixture influence the decreases of Mr values which is caused by RAP aggregate coating by bitumen. Lastly this study shows that 30% of RAP as an aggregate replacement is suitable gradation.
