Effects on Impact-Echo Signals Caused by Adjacent Steel Reinforcing Bars and Defects in Lap-Splice Regions: Experimental Study

ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

  


Title: Effects on Impact-Echo Signals Caused by Adjacent Steel Reinforcing Bars and Defects in Lap-Splice Regions: Experimental Study

Author(s): Alex Pagnotta, David Trejo, Paolo Gardoni and Qindan Huang

Publication: Special Publication

Volume: 292

Issue:

Appears on pages(s): 1-14

Keywords: impact-echo, defect around reinforcing bar, alkali-silica reaction, corrosion, steel-concrete interface, impact-echo transfer function

Date: 10/2/2013

Abstract:
Previous studies have identified the impact-echo method as a viable technique for detecting defects around steel reinforcing bars in reinforced concrete (RC) members. Defects can form around reinforcement as a result of corrosion, alkali-silica reactions, delayed ettringite formation, freezing and thawing, and other deterioration mechanisms. This paper investigates the feasibility of using impact echo testing on RC members to evaluate defects in lap-splice regions. In lapped bars challenges exist because adjacent bars may have different defect conditions. A small-scale experimental setup for making this determination is designed to replicate field conditions. Variables in the experiment include defect thickness and defect length. Impact-echo results from the small-scale experimental design are presented to determine if impact-echo testing can be used to identify the presence of defects at the steel concrete interface in specimens containing adjacent steel reinforcing bars.