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RILEM TC 281-CCC Working Group 6: Carbonation of alkali activated concrete—preliminary results of a literature survey and data analysis

  • The current understanding of the carbonation of alkali-activated concretes is ham-pered inter alia by the wide range of binder chemistries used. To overcome some of the limitations of individual studies and to identify general correlations between their mix design parameters and carbonation resistance, the RILEM TC 281-CCC working group 6 compiled 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. A preliminary analysis of the database indicates that w/CaO ratio and w/b ratio exert an influence on the carbonation resistance of alkali-activated concretes but, contrary to what has been reported for concretes based on (blended) Portland cements, these are not good indicators of their carbonation resistance when considered individually. A better indicator of the carbonation resistance ofThe current understanding of the carbonation of alkali-activated concretes is ham-pered inter alia by the wide range of binder chemistries used. To overcome some of the limitations of individual studies and to identify general correlations between their mix design parameters and carbonation resistance, the RILEM TC 281-CCC working group 6 compiled 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. A preliminary analysis of the database indicates that w/CaO ratio and w/b ratio exert an influence on the carbonation resistance of alkali-activated concretes but, contrary to what has been reported for concretes based on (blended) Portland cements, these are not good indicators of their carbonation resistance when considered individually. A better indicator of the carbonation resistance of alkali-activated concretes under conditions approxi-mating natural carbonation appears to be their w/(CaO + Na2O + K2O) ratio. Furthermore, the analysis points to significant shortcomings of tests at elevated CO2 concentrations for low-Ca alkali-activated concretes, indicating that even at a concentration of 1 % CO2, the outcomes may lead to inaccurate predictions of the carbonation coefficient under natural exposure conditions.zeige mehrzeige weniger

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Metadaten
Autor*innen:Gregor GluthORCiD, X. Ke, A. Vollpracht, S. A. Bernal, Ö. Cizer, M. Cyr, K. Dombrowski-Daube, D. Geddes, C. Grengg, C. Le Galliard, M. Nedeljkovic, J. L. Provis, Z. Shi, L. Valentini, B. Walkley
Persönliche Herausgeber*innen:J. I. Escalante-Garcia, P. Castro Borges, A. Duran-Herrera
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Proceedings of the 75th RILEM Annual Week 2021: Advances in Sustainable Construction Materials and Structures
Jahr der Erstveröffentlichung:2023
Organisationseinheit der BAM:7 Bauwerkssicherheit
7 Bauwerkssicherheit / 7.4 Baustofftechnologie
Verlag:Springer
Verlagsort:Cham
Jahrgang/Band:40
Erste Seite:667
Letzte Seite:676
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurbau
Freie Schlagwörter:Alkali-activated materials; Carbonation; Concrete; Durability; Testing
Themenfelder/Aktivitätsfelder der BAM:Infrastruktur
Veranstaltung:75th RILEM Annual Week
Veranstaltungsort:Mérida, Yucatán, Mexico
Beginndatum der Veranstaltung:30.08.2021
Enddatum der Veranstaltung:03.09.2021
DOI:10.1007/978-3-031-21735-7_72
ISSN:2211-0852
ISSN:2211-0844
ISBN:978-3-031-21734-0
ISBN:978-3-031-21735-7
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:16.03.2023
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:17.07.2023
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