Asphalt overlays provide an economical means for treating deteriorated pavements. Thin bonded overlay (TBO) systems have become popular options for pavement rehabilitation because they provide functional improvements and ensure a high degree of waterproofing benefits. The use of spray paver technology for the construction of TBO leads to continuously varying asphalt binder content, up to approximately one-third of the layer thickness.

The graded material behavior and thinness of TBOs make them challenging to characterize in a lab, and it is often difficult to realistically simulate them for design and analysis purposes. In this seminar, Eshan Dave will outline newly developed laboratory fracture measurement techniques, numerical simulation methods for design and analysis, and early field performances of TBOs.