In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
American Concrete Institute
38800 Country Club Dr.
Farmington Hills, MI
Feedback via Email
Home > Publications > 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.
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
Appears on pages(s): 1-14
Keywords: impact-echo, defect around reinforcing bar, alkali-silica reaction, corrosion, steel-concrete interface, impact-echo transfer function
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.
Click here to become an online Journal subscriber