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Development of Standard Specifications for Bending/Straightening Concrete Reinforcing Steel


This report describes the results of laboratory experiments in which concrete reinforcing steel of various sizes was "cold" and "hot" bent under different conditions and was subsequently straightened. The bent/straightened steel was inspected for cracking and tested in tension for strength and ductility.

The laboratory data were analyzed to determine the conditions that may cause reinforcing bars to crack during bending/straightening operations, or that may render the engineering properties of bars unsuitable for reinforcing concrete. The results of those analyses were used to propose standard specifications for bending/straightening reinforcing bars, for WSDOT considerations.


  • Date Published: April, 1991
  • Publication Number: WA-RD 216.1
  • Last Modified: September 26, 2007
  • Authors: Khossrow Babaei, Neil M. Hawkins.
  • Originator: Washington State Transportation Center (TRAC)
  • # of Pages: 48 p., 1,076 KB (PDF)
  • Subject: Bars (Building materials), Bending, Cracking, Ductility, Fracture mechanics, Laboratory tests, Reinforced concrete, Reinforcement (Engineering), Reinforcing steel, Specifications, Straightening, Tensile strength.
  • Keywords: Concrete, reinforcing steel, bending, strength, ductility, cracking.
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This abstract was last modified April 29, 2008