Abstract: The article describes laboratory investigations regarding production and performance of half-warm mix (HWMA) AC 16 asphalt concrete mixes with produced with foamed bitumen and incorporating hydrated lime. The experiments were designed to evaluate the influence of the hydrated lime added in partial substitution of limestone dust in the filler on the properties of the asphalt mixes produced at decreased temperatures. The performed laboratory tests included assessment of two reference asphalt mixtures (HMA and HWMA produced at ca. 120°C and compacted at ca. 100°C) and four HWMA mixes with 10% and 30% of limestone dust substituted for hydrated lime and with typical and increased (+0.3%) bitumen content. The mixtures were evaluated based on the air void content in Marshall samples (Vm) indirect tensile strength of dry and freeze-thawed Marshall samples (ITSdry, ITSfreeze-thaw), resistance to moisture and frost damage (ITSR) and wheel tracking performance (PRDair, WTSair). Additionally, a multivariate optimization of these properties was utilized to distinguish the best performing mixtures and showcase their features. The adopted methodology allowed to evaluate relationships between the investigated properties of the half-warm mix asphalt concrete and its composition in scope of the mix performance and its projected durability.
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