Abstract

Bio-oil (BO) derived from waste wood has the potential to be the modifier for asphalt binders. This study attempts to evaluate the effect of BO on the moisture damage potential of asphalt binder and mix by blending BO at two dosages (2 % and 4 %, by weight) in AC30. BO was obtained by fast pyrolysis of waste wood. To achieve this objective, surface free energy (SFE), bitumen bond strength, and indirect tensile strength tests were conducted for evaluating the cohesive and adhesive bond strength, the work of debonding, energy ratios (ERs), pull off tensile strength (POTS), and tensile strength ratio (TSR). The test results indicated that the addition of BO improves the cohesive and adhesive bond strength. Also, an increase in the work of debonding was observed by conducting the SFE test. Thereafter, ERs indicated that BO has compromised the moisture damage resistivity of AC30. A reduction in POTS was also observed on inclusion of BO. TSR of mixes reduced consistently on BO addition, thereby indicating that BO has compromised the moisture-induced damage resistivity of mixes. However, all mixes resulted in more than 80% TSR value, which is the minimum requirement to counter the moisture-induced damage. A “good” correlation was observed between ERs and TSR. This study concludes that although the inclusion of BO is a promising prospect, BO has the propensity to compromise the moisture-induced damage resistivity of the asphalt mix.

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