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Evaluations of Concrete Pavement Rehabilitations Focused on Portland Cement Concrete Overlays in Texas
As of 2016, Texas Department of Transportation (TxDOT) manages a total of 16,327 lane miles of Portland cement concrete (PCC) pavement, which represents an important asset to TxDOT. As PCC pavements in Texas built in the 1960s through 1980s have already exceeded or are approaching the end of their design lives, many of these projects will require rehabilitations of some form. Considering the expected steady increase in truck traffic in the future, PCC overlays represent one of the best options for that rehabilitation. Currently, guidelines on PCC pavement overlays on PCC pavement focus on overlay slab thickness determination, but do not provide clear directions on whether existing PCC pavement is a good candidate for concrete overlay, or if the pavement is a good candidate, which overlay type –bonded concrete overlay (BCO) or unbonded concrete overlay (UBCO) –is appropriate. Sound guidelines are needed for the selection of an optimum overlay type, especially for continuously reinforced concrete pavement (CRCP) overlays, which could extend the performance period of structurally deficient PCC pavements in Texas at a reasonable cost. In the present study, the evaluations of PCC overlay performance of various BCO and UBCO projects built in Texas were conducted to develop the BCO design procedures based on mechanistic-empirical principles, and the development of design guidelines for the selection of an optimum overlay type.
