Fang, G;
Wang, Q;
Zhang, M;
(2021)
Micromechanical analysis of interfacial transition zone in alkali-activated fly ash-slag concrete.
Cement and Concrete Composites
, 119
, Article 103990. 10.1016/j.cemconcomp.2021.103990.
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Abstract
This paper systematically investigates the micromechanical properties of interfacial transition zone (ITZ) in alkali-activated fly ash-slag (AAFS) concrete using nanoindentation, backscattered electron microscopy and energy dispersive spectroscopy. Results indicate that the micromechanical properties of ITZ depend on the chemical composition of reaction products and its microstructural characteristics. The ITZ with high proportion of N-C-A-S-H and C-A-S-H gels tends to have high elastic modulus because of their superior micromechanical properties. The formation of reaction products would refine the microstructure of ITZ and improve its elastic modulus. The evolution of micromechanical properties of ITZ can be divided into three stages: (i) accelerated growth stage via fast chemical reactions (<12 h); (ii) stationary stage via stable chemical reactions (12 h-7 d); (iii) decrement stage via microcrack propagation (7 d-28 d). ITZ is not the weakest region in AAFS concrete due to its desired micromechanical properties and compact microstructure compared to paste matrix.
| Type: | Article |
|---|---|
| Title: | Micromechanical analysis of interfacial transition zone in alkali-activated fly ash-slag concrete |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.cemconcomp.2021.103990 |
| Publisher version: | https://doi.org/10.1016/j.cemconcomp.2021.103990 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
| Keywords: | Alkali-activated materials, Nanoindentation, Elastic modulus, Hardness, Microstructure |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10122725 |
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