Abstract
ABSTRACT Hydrated lime (HL) has been used in asphalt mixtures to enhance the resistance to moisture damage in three ways, viz, as a filler, bitumen additive, and coating to aggregates. Quartzite aggregates are weaker in adhesion to asphalt binder due to higher silica content in chemical composition. This study compared three HL addition mechanisms to improve moisture-induced damage in hot mix asphalt made with high siliceous quartzite aggregates. Extensive experimental investigations were carried out, such as indirect tensile strength (ITS), tensile strength ratio (TSR), and fracture energy (FE), to compare the effects of HL addition with respect to conventional mixes. The ITS and TSR results found that HL-additive and HL-coating methods improved the resistance to moisture damage. Compared to control mixtures, HL-treated mixtures showed 20–25 percent higher TSR values. Meanwhile, the HL-filler method showed better resistance to fracture than the other two methods, offering better resistance to fracture in the field.
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