Description
This study was initiated to suggest possible solution for preventing moisture damage of the CRM-modified asphalt pavement mixtures. Among many candidates, the hydrated lime (HL) was selected as the best additive for improving aggregate-bitumen adhesion from previous studies. Asphalt concrete specimens were prepared using various
contents of the additive for estimating tensile strength retaining ratio by additive dosage under severe moisture condition. A cycle of freezing at -18oC and thawing at 25oC in 24 hours, and submerging at 60oC water for another 24 hours were applied for each specimen. The indirect tensile strength (ITS) before and after freezing and thawing cycle was measured and the retained tensile strength ratio (TSR) was calculated from the ITS test results. The TSR ratio improving levels were different for additive contents and a significant strength improvement was observed from 0.8% – 1.0% of HL contents.
