Effect of Contamination on Reinforcing Bar-Concrete Bond
Current specifications require the removal of reinforcing bar contaminants that reduce bond prior to placing concrete. This study focused on the interactions of contaminant type, bar size, epoxy coating, concrete strength, and test method (beam and direct pullout). The majority of the beam tests showed the bond strength was not significantly affected, with certain exceptions. However, the direct pullout tests revealed a significant reduction of bond strength in most situations. Although the bond strength was still greater than that required by code, it is recommended that specifications for removal of contaminants should not be relaxed until further study is performed.
A. Belarbi et al., "Effect of Contamination on Reinforcing Bar-Concrete Bond," Journal of Performance of Constructed Facilities, American Society of Civil Engineers (ASCE), May 2010.
The definitive version is available at http://dx.doi.org/10.1061/(ASCE)CF.1943-5509.0000091
Civil, Architectural and Environmental Engineering
Chemical and Biochemical Engineering
Associated General Contractors of America
Erectors and Riggers Association (St. Louis, Mo.)
Industry Advancement Fund
National University Transportation Center
Site Advancement Foundation
Southern Illinois Construction Advancement Program
St. Louis Construction Training and Advancement Foundation
Keywords and Phrases
Bond Strength; Construction Specifications; Contaminants; Reinforcing Bar Placement; Slippage; Splatter; Reinforced concrete; Reinforcing bars
Article - Journal
© 2010 American Society of Civil Engineers (ASCE), All rights reserved.