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. 2020 Aug 15;13(16):3616. doi: 10.3390/ma13163616

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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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View of the destroyed sample after the flexural strength test: (a) reference concrete; (b) fiber-reinforced concrete with steel fibers and (c) fiber-reinforced concrete with polypropylene fibers.