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Multiscale study of microstructural evolution in alkali-activated fly ash-slag paste at elevated temperatures

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. Green open access

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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
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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