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. 2020 Jul 14;13(14):3128. doi: 10.3390/ma13143128

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© 2020 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 (http://creativecommons.org/licenses/by/4.0/).

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(a) Roughened steel fibre after pullout (SE-Image). (b) Roughened steel fibre after pullout (BSE-image). Low-vacuum mode, voltage 15 kV, working distance 10 mm.