CO2 binding capacity of alkali-activated fly ash and slag pastes

Marija Nedeljković, Bahman Ghiassi, Stefan Melzer, Chris Kooij, Sieger van der Laan, Guang Ye

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Quantification of the CO2 binding capacity of reinforced concrete is of high importance for predicting the carbonation potential and service life of concrete structures. Such information is still not available for alkali activated materials that have received extensive attention as a sustainable substitute for ordinary Portland cement (OPC)-based concrete. To address this gap, this paper evaluates the CO2 binding capacity of ground powders of alkali activated fly ash (FA) and ground granulated blast furnace slag (GBFS) pastes under accelerated carbonation conditions (1% v/v CO2, 60% RH, 20 °C) for up to 180 days. The CO2 binding capacity, the gel phase changes, and the carbonate phases are investigated with complementary TG-DTG-MS, FT-IR and QXRD techniques. Five mixtures with different FA/GBFS ratio are considered. CEM I and CEM III/B pastes are also studied to provide a baseline for comparisons. The results showed that the alkali-activated pastes have a lower CO2 binding capacity in comparison to cement-based pastes. Furthermore, alkali-activated pastes have similar CO2 binding capacity regardless of the FA/GBFS ratio. It was observed that the silicate functional groups corresponding to the reaction products in the pastes were progressively changing during the first 7 days, after which only carbonate groups changed. It was also found that the CO2 bound in the alkali-activated pastes occurs to a substantial extent in amorphous form. Graphcal abstract: [Figure presented]

Original languageEnglish
Pages (from-to)19646-19660
Number of pages15
JournalCeramics International
Volume44
Issue number16
DOIs
Publication statusPublished - Nov 2018

Bibliographical note

Funding Information:
This research was carried out under the project S81.1.13498 in the framework of the Partnership Program of the Materials innovation institute M2i (www.m2i.nl) and the Technology Foundation STW (www.stw.nl), which is part of the Netherlands Organisation for Scientific Research (www.nwo.nl). The first author thanks Damir Kralj from Ru?er Bo?kovi? Institute, Zagreb, Croatia, for providing valuable data regarding FT-IR spectra of the standard CaCO3. The second author acknowledges the financial support of the European Union's Marie Curie Individual Fellowship program under REAgrant agreement No. 701531.

Funding Information:
This research was carried out under the project S81.1.13498 in the framework of the Partnership Program of the Materials innovation institute M2i ( www.m2i.nl ) and the Technology Foundation STW ( www.stw.nl ), which is part of the Netherlands Organisation for Scientific Research ( www.nwo.nl ). The first author thanks Damir Kralj from Ruđer Bošković Institute, Zagreb, Croatia, for providing valuable data regarding FT-IR spectra of the standard CaCO 3 . The second author acknowledges the financial support of the European Union's Marie Curie Individual Fellowship program under REAgrant agreement No. 701531 .

Publisher Copyright:
© 2018 Elsevier Ltd and Techna Group S.r.l.

Keywords

  • Alkali-activated FA/GBFS
  • CO binding capacity
  • TG-DTG-MS

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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