An Assurance Criterion for Flexural Bond Pretensioned Hollow Core Units


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Title: An Assurance Criterion for Flexural Bond Pretensioned Hollow Core Units

Author(s): Arthur R. Anderson and Richard G. Anderson

Publication: Journal Proceedings

Volume: 73

Issue: 8

Appears on pages(s): 457-464

Keywords: anchorage (structural) : bond (concrete to reinforcement); bonding; flexural strength: hollow core slabs: nondestructive tests: precast concrete; prestressed concrete; prestressing steels; postensioning; quality control; slippage.

Date: 8/1/1976

This paper reports the results of tests on 36 factory-produced hollow core units of spans ranging from 8 to 20 ft. The purpose of the test program was to investigate the flexural bond performance of routinely-produced precast-prestressed products. The specimens were obtained from five different plants on the West Coast. The tests indicate that the overwhelming majority of such members can be expected to meet or exceed the limiting tension in prestressing steel established by the bond development criteria of Section 12.1 1.1, ACI 3 I8-71. Evidence is presented showing a reserve of strength beyond the level of general bond failure, even under repeated load applications. A simple, nondestructive assurance procedure is proposed by which the quality of bond can be monitored within precasting plants. Production problems which may lead to poor bond between prestressing steel and concrete are discussed.