Monitoring Alkali-Silica Reaction Significance in Nuclear Concrete Structural Members

A large-scale testing program on alkali silica reaction (ASR)-affected concrete structural members without shear rein-forcement representative of structural members found in nuclear power plants is presented. Three concrete specimens, designed to experience a free expansion rate of approximately 0.1...

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Veröffentlicht in:Journal of Advanced Concrete Technology 2018/04/26, Vol.16(4), pp.179-190
Hauptverfasser: Hayes, Nolan Wesley, Gui, Qiang, Abd-Elssamd, Ammar, Pape, Yann Le, Giorla, Alain Benjamin, Pape, Sihem Le, Giannini, Eric R., Ma, Zhongguo John
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Sprache:eng
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Zusammenfassung:A large-scale testing program on alkali silica reaction (ASR)-affected concrete structural members without shear rein-forcement representative of structural members found in nuclear power plants is presented. Three concrete specimens, designed to experience a free expansion rate of approximately 0.15% per year were fabricated and placed within a controlled environmental chamber (38 ± 1°C (100 ± 2°F) and 95 ± 5% relative humidity (RH)). Sixty-four (64) embed-ded transducers and twelve (12) long-gauge fiber-optic sensors provide evidence of strong anisotropic expansion and oriented ASR-induced cracking resulting from the confinement effect caused by the reinforcement layout and addi-tional structural boundary conditions. Surface cracking is not indicative of internal ASR-induced damage/expansion.
ISSN:1346-8014
1347-3913
DOI:10.3151/jact.16.179