Effect of Contamination on Reinforcing Bar-Concrete Bond

Abstract

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.

Department(s)

Civil, Architectural and Environmental Engineering

Second Department

Chemical and Biochemical Engineering

Sponsor(s)

Associated General Contractors of America
Erectors and Riggers Association (St. Louis, Mo.)
Industry Advancement Fund
McCarthy Construction
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

International Standard Serial Number (ISSN)

0887-3828

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2010 American Society of Civil Engineers (ASCE), All rights reserved.

Publication Date

01 May 2010

Link to Full Text

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