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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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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    • NTL Classification:
      NTL-HIGHWAY/ROAD TRANSPORTATION-Design ; NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance ;
    • 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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