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Appl. Sci. 2017, 7(2), 123; doi:10.3390/app7020123

Microstructural Evolution within the Interphase between Hardening Overlay and Existing Concrete Substrates

Faculty of Civil Engineering, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
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Academic Editor: Jorge de Brito
Received: 23 December 2016 / Revised: 17 January 2017 / Accepted: 23 January 2017 / Published: 25 January 2017
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Abstract

This article presents the microstructural evolution within the interphase between a hardening overlay made of cement mortar and an existing concrete substrate. The substrate has been treated using four methods, due to which different surfaces were obtained: a raw surface, a surface formed after contact with the formwork, a grinded surface, and a shotblasted surface. Special focus is placed on the results of the microporosity within the interphase zone (IZ) using X-ray micro computed tomography (micro-CT). The microporosity profiles obtained from the micro-CT images have been used to assess the nature of the IZ between the hardening overlay and the existing concrete substrate. It has been shown that microporosity and the number of pores in the concrete within the IZ increases during the hardening time of an overlay made of cement mortar. It also depends on the applied surface treatment method. However, no significant changes in the microporosity of the existing concrete substrate have been noted. View Full-Text
Keywords: concrete; surface treatment; cement mortar; overlay; substrate; microporosity; microstructure; interface; interphase; X-ray micro computed tomography concrete; surface treatment; cement mortar; overlay; substrate; microporosity; microstructure; interface; interphase; X-ray micro computed tomography
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Sadowski, Ł.; Stefaniuk, D. Microstructural Evolution within the Interphase between Hardening Overlay and Existing Concrete Substrates. Appl. Sci. 2017, 7, 123.

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