Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Evaluation of Concrete Structures Affected by Alkali-Silica Reaction and Delayed Ettringite Formation - Part 2
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. Alkali-silica reaction (ASR) has been identified in reinforced concrete (RC) bridge columns, and petrographic analysis has indicated the presence of expansive ASR products at the interface between concrete and reinforcing steel, possibly changing the steel-concrete bond behavior.
Evaluation of Concrete Structures Affected by Alkali-Silica Reaction and Delayed Ettringite Formation - Part 2
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. Alkali-silica reaction (ASR) has been identified in reinforced concrete (RC) bridge columns, and petrographic analysis has indicated the presence of expansive ASR products at the interface between concrete and reinforcing steel, possibly changing the steel-concrete bond behavior.
Evaluation of Concrete Structures Affected by Alkali-Silica Reaction and Delayed Ettringite Formation - Part 2
P. Gardoni (Autor:in) / A. Pagnotta (Autor:in) / Q. Huang (Autor:in) / D. Trejo (Autor:in)
2013
130 pages
Report
Keine Angabe
Englisch