United States Department of Transportation
i
Evaluation of concrete structures affected by alkali-silica reaction and delayed ettringite formation - part 2.
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2012-12-01
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[PDF-7.11 MB]
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures;NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance;
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Abstract:This report details the results of a comprehensive research project aimed at evaluating the potential use of
non-destructive testing (NDT) to assess structures affected by ASR and/or DEF. This project was a
collaborative effort between the University of Texas at Austin and Texas A&M University (TAMU). The
results presented in this report are those obtained by the team at TAMU. Available data on the performance
of large-scale samples exhibiting alkali-silica reaction (ASR) and/or delayed ettringite formation (DEF) are
presented, and the analysis of these data shows that steel-concrete bond is affected by ASR/DEF. Multiple
techniques for assessing the steel-concrete interface are presented, and the impact-echo method is selected
for further study. A small-scale laboratory experiment using impact-echo shows that this technique has the
potential to detect ASR/DEF-induced defects at the steel-concrete interface. The application of impact-echo
to large-scale samples with ASR yields inconclusive results, and further work is needed to determine if
impact-echo can be used to assess the steel-concrete interface of ASR/DEF-affected field structures.
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