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Design and evaluation of high-volume fly ash (HVFA) concrete mixes, report B : bond behavior of mild reinforcing steel in HVFA concrete.
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2012-10-01
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Design ; NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance ;
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Abstract:The main objective of this study was to determine the effect on bond performance
of high-volume fly ash (HVFA) concrete. The HVFA concrete test program consisted of
comparing the bond performance of two concrete mix designs with 70% cement
replacement with Class C fly ash relative to a Missouri Department of Transportation
(MoDOT) standard mix design.
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
occurred prior to shear or flexural failure.
Analysis of the HVFA concrete test data indicates that using greater than 50%
replacement of cement with fly ash in concrete does not result in any increase in the
required development length of mild reinforcing steel.
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