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. 2021 Apr 23;14(9):2175. doi: 10.3390/ma14092175

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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

Microstructures of bio-sandstone improved with the bio-composite cement after (a,b) two injections; (c,d) four injections; and (e,f) six injections. Reprinted with permission from [77]. Copyright 2021 Elsevier.