RILEM TC 281-CCC Working Group 6: Carbonation of Alkali Activated Concrete

RILEM TC 281-CCC Working Group 6: Carbonation of Alkali Activated Concrete: Preliminary Results of a Literature Survey and Data Analysis

Gluth, Gregor J.G. (Federal Institute for Materials Research and Testing Berlin)
Ke, Xinyuan (University of Bath)
Vollpracht, Anya (Rheinisch-Westfälische Technische Hochschule)
Bernal, Susan A. (University of Leeds)
Cizer, Özlem (Katholieke Universiteit Leuven)
Cyr, Martin (Université de Toulouse)
Dombrowski-Daube, Katja (University of Technology Bergakademie Freiberg)
Geddes, Dan (University of Sheffield)
Nedeljković, Marija (TU Delft Materials and Environment)

2023

The current understanding of the carbonation of alkali-activated concretes is hampered 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 approximating 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.

Accelerated testing
Alkali-activated materials
Carbonation
Natural exposure

http://resolver.tudelft.nl/uuid:77d53af4-3764-49aa-8875-53a1f851225d

https://doi.org/10.1007/978-3-031-21735-7_72

Springer

2023-09-16

978-3-031-21734-0

Proceedings of the 75th RILEM Annual Week 2021: Advances in Sustainable Construction Materials and Structures, 40

RILEM Bookseries, 2211-0844, 40

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

book chapter

© 2023 Gregor J.G. Gluth, Xinyuan Ke, Anya Vollpracht, Susan A. Bernal, Özlem Cizer, Martin Cyr, Katja Dombrowski-Daube, Dan Geddes, Marija Nedeljković, More Authors