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... 1   Bonded concrete overlays on asphalt (BCOAs) consist of a 3- to 7-in.
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... 2 Evaluation of Bonded Concrete Overlays on Asphalt Pavements Laboratory testing of samples extracted from in-service pavements encompassed • Soil classification, the Atterberg limits, and gradation; • Concrete compressive and split tensile strength; • Concrete coefficient of thermal expansion; • Asphalt complex modulus; • Hamburg wheel tracking tests; • Asphalt bulk-specific gravity; and • Composite concrete–asphalt shear testing. Results of the in-service performance evaluations, based on in-service ages ranging from 7 to 26 years and subjected to low, moderate, and high traffic volumes, found most segments performing in good condition.

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