The current state of the accelerated concrete prism test / Jason H. Ideker in Cement and concrete research, Vol. 40 N° 4 (Avril 2010)  

Public ISBD [article]  inCement and concrete research > Vol. 40 N° 4 (Avril 2010) . - pp. 550–555 Titre : The current state of the accelerated concrete prism test Type de document : texte imprimé Auteurs : Jason H. Ideker, Auteur Année de publication : 2012 Article en page(s) : pp. 550–555 Note générale : Bibliogr. Langues : Anglais (eng) Mots-clés : Pore solution  Alkali–aggregate reaction  Durability  Alkalis  Accelerated concrete prism test Résumé : Expansions due to alkali–silica reaction (ASR) in the accelerated concrete prism test (ACPT–60 °C) show a significant reduction at 13 weeks compared to 52 week testing in the standard concrete prism test (CPT–38 °C). Previous work indicated that increased leaching, higher mass loss and a reduction in the pH were observed when temperature was increased from 38 to 60 °C. After further investigation the authors have revealed that non-reactive fine aggregate from certain sources combined with the same reactive coarse aggregate exhibited further reduction in expansion in the ACPT. Expansion data for a wide range of reactive coarse aggregates in 38 and 60 °C testing regimes is shown. Data investigating the Spratt reactive coarse aggregate combined with seven different non-reactive sands will be shown to demonstrate the dramatic effect of the non-reactive sand. Selected pore solution analyses will be given to further elucidate this issue. En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609002245 [article] The current state of the accelerated concrete prism test [texte imprimé] / Jason H. Ideker, Auteur . - 2012 . - pp. 550–555. Bibliogr. Langues : Anglais (eng) in Cement and concrete research > Vol. 40 N° 4 (Avril 2010) . - pp. 550–555 Mots-clés : Pore solution  Alkali–aggregate reaction  Durability  Alkalis  Accelerated concrete prism test Résumé : Expansions due to alkali–silica reaction (ASR) in the accelerated concrete prism test (ACPT–60 °C) show a significant reduction at 13 weeks compared to 52 week testing in the standard concrete prism test (CPT–38 °C). Previous work indicated that increased leaching, higher mass loss and a reduction in the pH were observed when temperature was increased from 38 to 60 °C. After further investigation the authors have revealed that non-reactive fine aggregate from certain sources combined with the same reactive coarse aggregate exhibited further reduction in expansion in the ACPT. Expansion data for a wide range of reactive coarse aggregates in 38 and 60 °C testing regimes is shown. Data investigating the Spratt reactive coarse aggregate combined with seven different non-reactive sands will be shown to demonstrate the dramatic effect of the non-reactive sand. Selected pore solution analyses will be given to further elucidate this issue. En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609002245

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