Using Computer Modeling to Improve the Design of Unbonded Concrete Overlays

Status:  Complete
Report Date:  01/30/2012

Summary:

Researchers evaluated existing design procedures for unbonded concrete overlays, including MnDOT guidelines, by analyzing UBCO crack propagation using a computer model that relates the load capacity of a pavement to its dimensions and material properties, including fracture energy. Results suggest that this model shows promise for improving UBCO design by determining the load capacity of a new single-layer portland cement concrete pavement designed using current procedures, and then determining thickness and material properties for a UBCO that will yield the same load capacity.

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