Correction to: Evaluation of surface cracks of bending concrete using a fully non-contact air-coupled nonlinear ultrasonic technique
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1 Correction to: Materials and Structures (2018) 51:104 https://doi.org/10.1617/s11527-018-1230-z
The article Evaluation of surface cracks of bending concrete using a fully non-contact air-coupled nonlinear ultrasonic technique, written by Jun Chen, Chenglong Yang and Quanquan Guo, was originally published online without open access. After publication in volume 51, article ID 104 RILEM decided to grant the author to opt for open choice and to make the article an open-access publication. Therefore, the copyright of the article has been changed to © The Author(s) 2018 and the article is forthwith distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, duplication, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.