Moisture damage in asphalt can lead to premature pavement failures and costly repairs. While hydrated lime is commonly used to reduce this risk, concerns around its carbon intensity and future supply have prompted investigations into alternative adhesion agents. This National Asset Centre of Excellence (NACOE) project evaluated the effectiveness of locally available binder adhesion agents (BAAs) using Queensland materials, while assessing the suitability of an interim Austroads laboratory testing protocol. Laboratory testing examined the moisture sensitivity of four South East Queensland aggregates using hydrated lime and alternative amine-, silane- and bio-oil based adhesion agents. The findings demonstrated that several liquid anti-stripping agents can provide equivalent or improved performance compared to hydrated lime, although effectiveness varies depending on aggregate type. The study also supported the use of multiple laboratory testing methods to assess moisture sensitivity until a more reliable standardised approach is developed. The findings provide valuable insights into alternative moisture damage mitigation strategies, supporting the potential use of more sustainable materials in Queensland's asphalt pavements.
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