TY - GEN
T1 - Effects on impact-echo signals caused by adjacent steel reinforcing bars and defects in lap-splice regions
T2 - Structural Health Monitoring Technologies 2011 at the ACI Fall 2011 Convention
AU - Pagnotta, Alex
AU - Trejo, David
AU - Gardoni, Paolo
AU - Huang, Qindan
PY - 2011
Y1 - 2011
N2 - 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.
AB - 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.
KW - Alkali-silica reaction
KW - Corrosion
KW - Defect around reinforcing bar
KW - Impact-echo
KW - Impact-echo transfer function
KW - Steel-concrete interface
UR - http://www.scopus.com/inward/record.url?scp=84904254172&partnerID=8YFLogxK
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M3 - Conference contribution
AN - SCOPUS:84904254172
SN - 9781632663214
T3 - American Concrete Institute, ACI Special Publication
SP - 88
EP - 100
BT - Structural Health Monitoring Technologies 2011 - Held at the ACI Fall 2011 Convention
PB - American Concrete Institute
Y2 - 16 October 2011 through 20 October 2011
ER -