Abstract
Carbonation of alkali-activated fly ash (FA) and ground granulated blast furnace slag (GBFS) pastes has been investigated after one year of exposure to 0.038 % (v/v) CO2 at 20°C, 55% RH. In particular, the aim was to study the gel deterioration in the samples and changes of the compositions and proportions of the individual chemical domains after carbonation. For that purpose, a new method called PhAse Recognition and Characterization (PARC) [1] based on SEM-EDS elemental mapping was used. The paste bulk chemical composition was evaluated with PARC and XRF. The crystalline products of carbonation were determined and quantified with X-ray diffraction (XRD). Local microanalysis shows that carbonation of the pastes was occurring predominantly around GBFS particles (carbonation of Ca-(Na-)Al-Si-H+Mg gel) and throughout the gel (carbonation of Ca-(Na-)Al-Si-H and Ca-(Na-)Si-H).
Original language | English |
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Title of host publication | 4th International Conference on Service Life Design for Infrastructures |
Subtitle of host publication | (SLD4) 27-30 August 2018 – Delft, Netherlands |
Editors | Guang Ye, Yong Yuan, Claudia Romero Rodriguez, Hongzhi Zhang, Branko Šavija |
Publisher | Rilem |
Pages | 512-515 |
ISBN (Electronic) | 978-2-35158-213-8 |
Publication status | Published - 2018 |
Event | 4th International Conference on Service Life Design for Infrastructures - Delft, Netherlands Duration: 27 Aug 2018 → 30 Aug 2018 Conference number: 4 |
Publication series
Name | Rilem proceedings |
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Publisher | Rilem |
Number | PRO 125 |
Conference
Conference | 4th International Conference on Service Life Design for Infrastructures |
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Abbreviated title | SLD4 |
Country/Territory | Netherlands |
City | Delft |
Period | 27/08/18 → 30/08/18 |
Keywords
- Alkali-activated GBFS and FA
- gel
- Carbonation
- PARC