Micromechanical analysis of alkali-activated fly ash-slag paste subjected to elevated temperatures

Article


Tu, W., Fang, G., Dong, B. and Zhang, M. 2024. Micromechanical analysis of alkali-activated fly ash-slag paste subjected to elevated temperatures. Cement and Concrete Composites. 153 (Art. 105735). https://doi.org/10.1016/j.cemconcomp.2024.105735
AuthorsTu, W., Fang, G., Dong, B. and Zhang, M.
Abstract

To advance the development of high-temperature/fire-resistant alkali-activated materials, it is vital to understand their behaviour subjected to elevated temperatures. This paper presents a systematic experimental study on microstructural characteristics and micromechanical properties of alkali-activated fly ash-slag paste (AAFS) after exposure to 20–800 °C. The microstructural evolution in terms of morphology, phase assemblage and gel compositions was examined using backscattered scanning electron microscope-energy dispersive spectrometry (BSEM-EDS), while atomic force microscopy (AFM) and nanoindentation tests were conducted to evaluate the micromechanical properties at elevated temperatures. Results indicate that the volume fraction of unreacted particles drops from 29.7 % to 4.0 %, whereas porosity in AAFS paste goes up from 4.1 % to 15.4 % at up to 800 °C. The average hardness and elastic modulus are in the ranges of 0.6–14.5 GPa and 27.0–104.2 GPa, respectively. Based on the obtained experimental results, the microstructure-micromechanical property relations and inherent damage mechanisms were then discussed in depth from a multiscale viewpoint.

JournalCement and Concrete Composites
Journal citation153 (Art. 105735)
ISSN0958-9465
Year2024
PublisherElsevier
Accepted author manuscript
License
File Access Level
Anyone
Digital Object Identifier (DOI)https://doi.org/10.1016/j.cemconcomp.2024.105735
Publication dates
Online30 Aug 2024
Publication process dates
Accepted29 Aug 2024
Deposited04 Sep 2024
Copyright holder© 2024 Elsevier
Permalink -

https://repository.uel.ac.uk/item/8y3qz

Restricted files

Accepted author manuscript

  • 43
    total views
  • 0
    total downloads
  • 3
    views this month
  • 0
    downloads this month

Export as

Related outputs

Alkali-activated materials with organics: A critical review
Ruan, S., Gao, R., Tu, W., Yan, D. and Zhang, M. 2024. Alkali-activated materials with organics: A critical review. Composites Part B: Engineering. 284 (Art. 111712). https://doi.org/10.1016/j.compositesb.2024.111712
Multiscale microstructure and micromechanical properties of alkali-activated concrete: A critical review
Tu, W. and Zhang, M. 2024. Multiscale microstructure and micromechanical properties of alkali-activated concrete: A critical review. Cement and Concrete Composites. 152 (Art. 105664). https://doi.org/10.1016/j.cemconcomp.2024.105664