Effects on impact-echo signals caused by adjacent steel reinforcing bars and defects in lap-splice regions: Experimental study

Alex Pagnotta, David Trejo, Paolo Gardoni, Qindan Huang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish (US)
Title of host publicationStructural Health Monitoring Technologies 2011 - Held at the ACI Fall 2011 Convention
PublisherAmerican Concrete Institute
Pages88-100
Number of pages13
Edition292 SP
ISBN (Print)9781632663214
StatePublished - Jan 1 2011
EventStructural Health Monitoring Technologies 2011 at the ACI Fall 2011 Convention - Cincinnati, OH, United States
Duration: Oct 16 2011Oct 20 2011

Publication series

NameAmerican Concrete Institute, ACI Special Publication
Number292 SP
ISSN (Print)0193-2527

Other

OtherStructural Health Monitoring Technologies 2011 at the ACI Fall 2011 Convention
CountryUnited States
CityCincinnati, OH
Period10/16/1110/20/11

Keywords

  • Alkali-silica reaction
  • Corrosion
  • Defect around reinforcing bar
  • Impact-echo
  • Impact-echo transfer function
  • Steel-concrete interface

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

Fingerprint Dive into the research topics of 'Effects on impact-echo signals caused by adjacent steel reinforcing bars and defects in lap-splice regions: Experimental study'. Together they form a unique fingerprint.

Cite this