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. 2020 May 20;10:8318. doi: 10.1038/s41598-020-65285-6

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, 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. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Fluorescence image of microcapsules in hardening cementitious matrix for a slice from the IC-5% sample with a field of view is 620 mm × 890 mm; (b) SEM image of microcapsules in hardening cementitious matrix; (c) SEM image of cracking on microcapsules triggered by cementitious matrix. (d) SEM image of dissolved microcapsules in cementitious matrix; microcapsule fabrication: polymer dose, 1%; stirring rate, 250 rpm; PVA concentration in outer water phase, 0.5%.