Report C : self-consolidating concrete (SCC) for infrastructure elements - bond behavior of mild reinforcing steel in SCC.
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2012-08-01
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Edition:Final report.
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Abstract:The main objective of this study was to determine the effect on bond performance
of mild reinforcing steel in self-consolidating concrete (SCC). The SCC test program
consisted of comparing the bond performance of normal and high strength SCC with their
respective MoDOT standard mix designs.
Two test methods were used for bond strength comparisons. The first was a direct
pull-out test based on the RILEM 7-II-128 “RC6: Bond test for reinforcing steel. 1. Pullout
test” (RILEM, 1994). The direct pull-out tests were performed on specimens with #4
(#13) and #6 (#19) deformed reinforcing bars.
The second test method consisted of a full-scale beam splice test specimen
subjected to a four-point loading until failure of the splice. This test method is a non-
ASTM test procedure that is generally accepted as the most realistic test method for both
development and splice length. The beam splice tests were performed on beams with #6
(#19) reinforcing bars spliced at midspan at a specific length to ensure bond failure
occurs prior to shear or flexural failure.
Analysis of the SCC data indicates that using SCC does not result in any increase
in the required development length of mild reinforcing.
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