Investigation into three-layered HMA mixtures

摘要: Abstract Hot-mix asphalt (HMA) mixtures consist of three phases: aggregate, binder (mastic) and air voids, which the first two (aggregate binder) provide structure that withstands various kinds loading. Due to nature high inhomogeneity between aggregate binder, significant stress strain concentration occurs at interface phases, causes adverse effect HMA potentially contributes pavement distresses/failure. This paper presents a novel idea mitigate by introducing an intermediate layer in mixture. Microstructural analyses layered system indicated three-layered composite mixture would greatly improve performance The showed more than 10% reduction internal consequently its could be improved. To validate theoretical analyses, laboratory experiment was conducted compare conventional conceptual mixture, formed incorporating stiff natural (gilsonite) as layer. results limited confirmed findings from analyses.