Development of an asphalt concrete mixture for Asphalt Core Rockfill Dam

The main objective of this paper is to develop asphalt concrete mixture and conduct performance tests for Asphalt Core Rockfill Dam (ACRD). Three conditions of mineral filler content have been used: 10, 12 and 14%, namely: F10, F12 and F14 respectively. The amount of optimum bitumen for each filler condition were determined by Marshall mix design method. The stress strain properties of the asphalt concrete (AC) were studied through Unconfined Compression Strength (UCS) Test, Indirect Tensile Test (IDT) and Triaxial Tests. Moisture susceptibility and water penetration were evaluated using Indirect Tensile Test and Permeability Test respectively. The result exhibits that the increase of filler content from 10 to 14% has significant effect on optimum asphalt content and properties of asphalt concrete mixture. Among all mixtures, mix F10 yielded highest strength behavior and moisture resistance. Result also suggests that asphalt concrete specimen was impervious to water (k value <10−8 mm/s) when the mixture was produced at air void content no larger than 4%, 3.4% and 3.6% in mix F10, F12 and F14 respectively.