Civil Engineering Association

THE EFFECT OF HIGH STRENGTH CONCRETE ON THE BONDABILITY OF PRESTRESSING STRANDS

Adequate bond between prestressing strand and concrete is essential for adequate structural performance and reliability of concrete members. Bond quality affects transfer and development lengths of prestressed members. If the bond between the strand and concrete is not enough, the transfer and development length of the member may exceed the code requirement. Hence non ductile failure occurs due to inadequate shear reinforcement provision. Researchers found the current code equations governing the bond of strand have been shown to be inaccurate. Hence bond test is needed that will help to determine the effects on bond of variations in concrete properties or constituent materials. The Prestress Concrete Institute (PCI) financed projects that investigated strands manufactured by various manufacturers using various test methods. Research conducted by Cousin,
Johnson and Zia indicates that the ACI code equations for bond might be inadequate and more research is needed to fully understand the bond mechanics between concrete and
prestressing strand. According to Mote (2001), concrete strength would affect bond of prestessing strand.

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