a Opole University of Technology, Faculty of Civil Engineering and Architecture, Department of Physics of Materials, Katowicka 48,. 45-061 Opole, Poland.
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1877-7058 © 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license
(http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the organizing committee of BDB 2016
doi:10.1016/j.proeng.2016.08.306
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