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

Preliminary Results of a Literature Survey and Data Analysis

Book chapter (2023)

Authors

Gregor J.G. Gluth Federal Institute for Materials Research and Testing Berlin
Xinyuan Ke University of Bath
Anya Vollpracht Rheinisch-Westfälische Technische Hochschule
Susan A. Bernal University of Leeds
Özlem Cizer Katholieke Universiteit Leuven
Martin Cyr Université de Toulouse
Katja Dombrowski-Daube University of Technology Bergakademie Freiberg
Dan Geddes University of Sheffield
Marija Nedeljković Materials and Environment - CEG
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Research Group
Materials and Environment (CEG) (TU Delft)
Copyright: © 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
DOI
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https://doi.org/10.1007/978-3-031-21735-7_72
Carbonation Alkali-activated materials Natural exposure Accelerated testing
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Published Date

2023

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Materials- Mechanics- Management & Design

Research Group

Materials and Environment

Abstract

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.