Gregor Gluth, X. Ke, A. Vollpracht, L. Weiler, S. A. Bernal, M. Cyr, K. Dombrowski-Daube, D. Geddes, C. Grengg, C. Le Galliard, M. Nedeljkovic, J. L. Provis, L. Valentini, B. Walkley
- The current ability to predict the carbonation resistance of alkali-activated materials (AAMs) is incomplete, partly because of widely varying AAM chemistries and variable testing conditions. To identify general correlations between mix design parameters and the carbonation rate of AAMs, RILEM TC 281-CCC Working Group 6 compiled and analysed carbonation data for alkali-activated concretes and mortars from the literature. For comparison purposes, data for blended Portland cement-based concretes with a high percentage of SCMs (≥66% of the binder) were also included in the database. The results show that the water/CaO ratio is not a reliable indicator of the carbonation rate of AAMs. A better indicator of the carbonation rate of AAMs under conditions approximating natural carbonation is their water/(CaO + MgOeq + Na2Oeq + K2Oeq) ratio, where the index ‘eq’ indicates an equivalent amount based on molar masses. This finding can be explained by the CO2 binding capacity of alkaline-earth andThe current ability to predict the carbonation resistance of alkali-activated materials (AAMs) is incomplete, partly because of widely varying AAM chemistries and variable testing conditions. To identify general correlations between mix design parameters and the carbonation rate of AAMs, RILEM TC 281-CCC Working Group 6 compiled and analysed carbonation data for alkali-activated concretes and mortars from the literature. For comparison purposes, data for blended Portland cement-based concretes with a high percentage of SCMs (≥66% of the binder) were also included in the database. The results show that the water/CaO ratio is not a reliable indicator of the carbonation rate of AAMs. A better indicator of the carbonation rate of AAMs under conditions approximating natural carbonation is their water/(CaO + MgOeq + Na2Oeq + K2Oeq) ratio, where the index ‘eq’ indicates an equivalent amount based on molar masses. This finding can be explained by the CO2 binding capacity of alkaline-earth and alkali metal ions; the obtained correlation also indicates an influence of the space-filling capability of the binding phases of AAMs, as for conventional cements. However, this ratio can serve only as an approximate indicator of carbonation resistance, as other parameters also affect the carbonation resistance of alkali-activated concretes. In addition, the analysis of the dataset revealed peculiarities of accelerated tests using elevated CO2 concentrations for low-Ca AAMs, indicating that even at the relatively modest concentration of 1% CO2, accelerated testing may lead to inaccurate predictions of their carbonation resistance under natural exposure conditions.…
MetadatenAutor*innen: | Gregor GluthORCiD, X. Ke, A. Vollpracht, L. Weiler, S. A. Bernal, M. Cyr, K. Dombrowski-Daube, D. Geddes, C. Grengg, C. Le Galliard, M. Nedeljkovic, J. L. Provis, L. Valentini, B. Walkley |
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Persönliche Herausgeber*innen: | A. Jędrzejewska, F. Kanavaris, M. Azenha, F. Benboudjema, D. Schlicke |
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Dokumenttyp: | Beitrag zu einem Tagungsband |
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Veröffentlichungsform: | Verlagsliteratur |
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Sprache: | Englisch |
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Titel des übergeordneten Werkes (Englisch): | International RILEM Conference on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures: SynerCrete 2023 |
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Jahr der Erstveröffentlichung: | 2023 |
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Organisationseinheit der BAM: | 7 Bauwerkssicherheit |
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| 7 Bauwerkssicherheit / 7.4 Baustofftechnologie |
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Verlag: | Springer |
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Verlagsort: | Cham |
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Jahrgang/Band: | 2 |
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Erste Seite: | 1029 |
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Letzte Seite: | 1037 |
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DDC-Klassifikation: | Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurbau |
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Freie Schlagwörter: | Alkali-activated materials; Carbonation; Mix design |
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Themenfelder/Aktivitätsfelder der BAM: | Infrastruktur |
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Veranstaltung: | International RILEM Conference on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures: SynerCrete 2023 |
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Veranstaltungsort: | Adamantas, Greece |
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Beginndatum der Veranstaltung: | 14.06.2023 |
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Enddatum der Veranstaltung: | 16.06.2023 |
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DOI: | 10.1007/978-3-031-33187-9_94 |
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Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
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Datum der Freischaltung: | 19.06.2023 |
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Referierte Publikation: | Nein |
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