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Materials 2018, 11(6), 993; https://doi.org/10.3390/ma11060993

Investigation of Tensile Creep of a Normal Strength Overlay Concrete

Unit for Strength of Materials and Structural Analysis, Institute of Basic Sciences in Engineering Sciences, Innsbruck University, Technikerstr. 13, A-6020 Innsbruck, Austria
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Received: 15 May 2018 / Revised: 5 June 2018 / Accepted: 8 June 2018 / Published: 12 June 2018
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Abstract

The present contribution deals with the experimental investigation of the time-dependent behavior of a typical overlay concrete subjected to tensile stresses. The latter develop in concrete overlays, which are placed on existing concrete structures as a strengthening measure, due to the shrinkage of the young overlay concrete, which is restrained by the substrate concrete. Since the tensile stresses are reduced by creep, creep in tension is investigated on sealed and unsealed specimens, loaded at different concrete ages. The creep tests as well as the companion shrinkage tests are performed in a climatic chamber at constant temperature and constant relative humidity. Since shrinkage depends on the change of moisture content, the evolution of the mass water content is determined at the center of each specimen by means of an electrolytic resistivity-based system. Together with the experimental results for compressive creep from a previous study, a consistent set of time-dependent material data, determined for the same composition of the concrete mixture and on identical specimens, is now available. It consists of the hygral and mechanical properties, creep and shrinkage strains for both sealed and drying conditions, the respective compliance functions, and the mass water contents in sealed and unsealed, loaded and load-free specimens. View Full-Text
Keywords: concrete; tensile creep; shrinkage; mass water content concrete; tensile creep; shrinkage; mass water content
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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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Drexel, M.; Theiner, Y.; Hofstetter, G. Investigation of Tensile Creep of a Normal Strength Overlay Concrete. Materials 2018, 11, 993.

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