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. 2021 Jul 30;14(15):4264. doi: 10.3390/ma14154264

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

PMC Copyright notice

Scanning electron micrographs (SEMs) of cement and fly ash. (a) Cement; (b) Class C; (c) Class F; (d) SW1; (e) SW2 and (f) Wood [66]. Reprinted with permission from Elsevier [66].