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

Gregor J.G. Gluth, Xinyuan Ke, Anya Vollpracht, Susan A. Bernal, Özlem Cizer, Martin Cyr, Katja Dombrowski-Daube, Dan Geddes, Cyrill Grengg, Cassandre Le Galliard, Marija Nedeljkovic, John L. Provis, Zhenguo Shi, Luca Valentini, Brant Walkley

Research output: Chapter or section in a book/report/conference proceedingChapter or section

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.

Original languageEnglish
Title of host publicationProceedings of the 75th RILEM Annual Week 2021. RW 2021
EditorsJ. I. Escalante-Garcia, P. Castro Borges, A. Duran-Herrera
Place of PublicationCham, Switzerland
PublisherSpringer Science and Business Media B.V.
Pages667-676
Number of pages10
ISBN (Electronic)9783031217357
ISBN (Print)9783031217340
DOIs
Publication statusPublished - 11 Mar 2023
Event75th RILEM Annual Week & International Conference on Advances in Sustainable Construction Materials and Structures - Merida, Mexico
Duration: 30 Aug 20213 Sept 2021
http://rilemweek2021.uanl.mx/

Publication series

NameRILEM Bookseries
Volume40
ISSN (Print)2211-0844
ISSN (Electronic)2211-0852

Conference

Conference75th RILEM Annual Week & International Conference on Advances in Sustainable Construction Materials and Structures
Country/TerritoryMexico
Period30/08/213/09/21
Internet address

Bibliographical note

Funding Information:
This article was prepared within the framework of RILEM TC 281-CCC. The article has been reviewed and approved by all members of the TC. Lia Weiler (RWTH Aachen University) is thanked very much for assistance in extending and reviewing the database. Participation of S. A. Bernal in this study was sponsored by the Engineering and Physical Sciences Research Council (EPSRC) through the ECF EP/R001642/1.

Keywords

  • Accelerated testing
  • Alkali-activated materials
  • Carbonation
  • Natural exposure

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanics of Materials

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