Tu, Wenlin;
Fang, Guohao;
Dong, Biqin;
Zhang, Mingzhong;
(2023)
Multiscale study of microstructural evolution in alkali-activated fly ash-slag paste at elevated temperatures.
Cement and Concrete Composites
, 143
, Article 105258. 10.1016/j.cemconcomp.2023.105258.
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Abstract
To promote the high-temperature application of alkali-activated fly ash-slag (AAFS), it is vital to thoroughly understand the performance of AAFS at elevated temperatures. This paper presents a systematic study on the multiscale microstructural evolution in AAFS paste in terms of nanostructure, chemical composition and morphology changes characterised using 29Si nuclear magnetic resonance, X-ray diffraction and Fourier transform infrared spectroscopy, as well as the pore structure evolution by means of mercury intrusion porosimetry, backscattered electron microscopy and X-ray microcomputed tomography. Results indicate that the decomposition of C-A-S-H and N–C-A-S-H gels occurs while gel pores are filled at elevated temperatures up to 800 °C, along with the crack development, whereas micro-cracks are healed by melting and viscous sintering. This study provides an in-depth insight into the damage mechanisms of AAFS paste at elevated temperatures from a multiscale viewpoint, accounting for Level I: solid gel particles, Level II: gel matrix, and Level III: AAFS paste.
Type: | Article |
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Title: | Multiscale study of microstructural evolution in alkali-activated fly ash-slag paste at elevated temperatures |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1016/j.cemconcomp.2023.105258 |
Publisher version: | https://doi.org/10.1016/j.cemconcomp.2023.105258 |
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, Geopolymer, Nanostructure, Microstructure, 3D pore structure, Damage evolution |
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 |
URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10175610 |
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