Research on Composite Pile Behavior and Development of a Rock Strength Database

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Status:  Complete
Report Date:  06/28/2018


For a bridge project in northern Minnesota, bridge designers needed data on hard rock that was too strong for MnDOT's standard testing approach. Researchers used a high-capacity load frame at the University of Minnesota to test rock samples from the project site and to examine the stiffness characteristics of concrete-filled steel piles used throughout the state. The study provided key data for the bridge design and validated MnDOT's practice of using concrete-filled steel piling for bridge load bearing and load transfer to the underlying bedrock.

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