TY - CONF A1 - Gluth, Gregor A1 - Ke, X. A1 - Vollpracht, A. A1 - Bernal, S. A. A1 - Cizer, Ö. A1 - Cyr, M. A1 - Dombrowski-Daube, K. A1 - Geddes, D. A1 - Grengg, C. A1 - Le Galliard, C. A1 - Nedeljkovic, M. A1 - Provis, J. L. A1 - Shi, Z. A1 - Valentini, L. A1 - Walkley, B. ED - Escalante-Garcia, J. I. ED - Castro Borges, P. ED - Duran-Herrera, A. T1 - RILEM TC 281-CCC Working Group 6: Carbonation of alkali activated concrete—preliminary results of a literature survey and data analysis T2 - Proceedings of the 75th RILEM Annual Week 2021: Advances in Sustainable Construction Materials and Structures N2 - 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 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. T2 - 75th RILEM Annual Week CY - Mérida, Yucatán, Mexico DA - 30.08.2021 KW - Alkali-activated materials KW - Durability KW - Carbonation KW - Testing KW - Concrete PY - 2023 SN - 978-3-031-21734-0 SN - 978-3-031-21735-7 DO - https://doi.org/10.1007/978-3-031-21735-7_72 SN - 2211-0852 SN - 2211-0844 VL - 40 SP - 667 EP - 676 PB - Springer CY - Cham AN - OPUS4-57157 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -