Case Studies to Determine the Relationship between Rehabilitation Process, Hot-Mix Asphalt Lift Thickness, and Pavement Smoothness

摘要

With the introduction of High Speed Inertial Profilograph (HSP), it has become possible to ascertainrnpavement smoothness accurately and instantaneously. HSP used for Highway smoothness testing inrnOntario are ASTM Class 1 compliant, with capability to determining the smoothness of the pavementrnlayer accurately and in a repeatable manner. The HSP can be operated at speeds of up to 80km/hr forrnprompt results with minimum interruption to traffic during smoothness testing. Users of the Profilographrndevices have started utilizing the HSP as a tool to isolate operational issues from pre-existing conditionsrnwith the objective of achieving the desired contractual smoothness as a function of the rehabilitationrnprocess and lift(s) thickness of hot-mix asphalt. Case studies were undertaken on various highways inrnOntario, that were undergoing Full Depth Reclamation (FDR), Cold-in-place Recycling (CIR), ExpandedrnAsphalt Stabilization (cold in-place recycling with expanded asphalt, CIREAM) processes andrnconventional grind-and-pave projects. This paper outlines key lessons learned from the results of thesernstudies, with special attention given to achievable smoothness end results as a function of thernrehabilitation process. The paper also summarizes guidelines established as a result of this study tornundertake profile-quality-control of various types of rehabilitation techniques outlined above.