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    Effect of the roughness of steel fibre surface on its wettability and the cement paste close to fibre surface

    Year: 2021

    Journal: Constr. Build. Mater., Volume 289, JUN 28

    Authors: Antonova, Anna; Eik, Marika; Jokinen, Ville; Puttonen, Jari

    Organizations: AaltoENG doctoral programme of the School of Engineering of the Aalto University

    Keywords: Fibre-matrix interface; Steel fibre; Surface treatment; k-means clustering; Roughness; Contact angle; Wetting; ITZ

    This study experimentally examines the relationship between fibre surface roughness, its wettability, and the microstructure of the cement paste close to the fibre. Results indicate that the amount of water that adheres to or is retained by the fibre surface grows with the increase in roughness. The distributions of porosity and of unhydrated cement grains, which were produced through analysis of BSE images with a k-means clustering algorithm up to 100 lm from fibre surface, revealed a decrease in both large pores and porosity when roughness increased but not a clear effect on the distribution of unhydrated cement grains. (C) 2021 The Author(s). Published by Elsevier Ltd.
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