Title:
Effect of Reinforcing Bar Orientation and Location on Bond with Self-Consolidating Concrete
Author(s):
Arnaud Castel, Thierry Vidal, Kriengkai Viriyametanont, and Raoul Francois
Publication:
Structural Journal
Volume:
103
Issue:
4
Appears on pages(s):
559-567
Keywords:
bars; self-consolidating concrete; strength
DOI:
10.14359/16432
Date:
7/1/2006
Abstract:
In this paper, the effect of reinforcing bar orientation and location on steel-concrete bond behavior is studied. The investigations are performed on two self-consolidating concretes (SCCs) and two vibrated concretes (VCs) (25 and 40 MPa [3625 and 5800 psi]). Different casting conditions are used to study the effect of the reinforcement orientation (vertical or horizontal) in relation with the casting direction and the effect of the horizontal bars’ location along the height of small and tall concrete elements. In this study, the concrete casting direction is always vertical. For small-size concrete elements, SCC25 shows a better resistance against bleeding than VC25. The difference, however, is not significant for SCC40 and VC40. For samples reinforced with ribbed bars, the orientation of the bars (horizontal or vertical) has a significant and equivalent influence on both 25 MPa (3625 psi) concretes. The VC40 and SCC40 bond strength values are almost equivalent and not affected by the orientation of the bars. For tall concrete elements, voids formation under the horizontal bars was clearly observed for every type of concrete. The size of the voids was almost equivalent for SCC25, SCC40, and VC40, but significantly larger in the case of VC25, especially near the top casting surface. Finally, the maximum ultimate bond strengths obtained were approximately 20% higher for SCC than for VC, regardless of the concrete strength.