Bond Between High-Performance Concrete (HPC) and Reinforcing Bars in Splices of Beams

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Title: Bond Between High-Performance Concrete (HPC) and Reinforcing Bars in Splices of Beams

Author(s): Mohammad-Reza Esfahani and B. V. Rangan

Publication: Special Publication

Volume: 172

Issue:

Appears on pages(s): 971-992

Keywords: Bonding; concretes; high-performance concretes; high-strength concretes; reinforcing materials; silica fume; splicing

Date: 12/1/1999

Abstract:
The paper presents studies on local bond and bond strength of splices. The study was conducted in two stages. In the first stage, an analytical equation was developed to calculate the bond strength of splices in normal strength concrete. The mean value of test/calculated bond strength for the proposed equation is 1.007 with a standard deviation of 0.08 1. The second stage of the study comprised the study on local bond and the bond strength of splices in the case of high performance concrete (HPC)/high strength concrete (HSC). The study on local bond involved tests on forty five short length specimens. Using these test results, a relationship for bond strength normalised with respect to the tensile strength of concrete is obtained. The study of bond in splices involved tests on twenty two beams made of HPC/HSC. In each beam, the tensile steel was spliced in the constant moment zone. Using the relationship for local bond in HPC/HSC, the analytical model developed for normal strength concrete is modified. Good correlation between calculated and test strengths of splices in the case of HPC/HSC is found.