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- W2116804142 abstract "The influence of applied stresses on adsorbed water in cement paste has been proposed long ago (independently by Powers and by Ruetz) as a possible mechanism able to explain delayed deformations (creep) of concrete. Following this approach, the application of compressive stresses should lead to an increase in internal relative humidity (RH). This hypothesis has never been confirmed experimentally. Even though water redistribution due to loading was applied in some modeling approaches for description of short-term creep, the RH dependence upon the stress state has generally been neglected over the past decades. This study shows that instantaneous RH changes do accompany applied load and can be accurately measured. Moreover, the measured RH changes may in fact explain a large part of the short-term creep deformation and also the commonly-observed difference between static and dynamic elastic moduli. In this study, mortars made with water-to-cement ratio of 0.3 were loaded in uniaxial compression or tension, while internal RH was measured by means of embedded water activity sensors. At the same time, elastic moduli were measured in compression using both the standard static method and ultrasound resonance spectroscopy." @default.
- W2116804142 created "2016-06-24" @default.
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- W2116804142 date "2015-09-17" @default.
- W2116804142 modified "2023-09-26" @default.
- W2116804142 title "RH Dependence upon Applied Load: Experimental Study on Water Redistribution in the Microstructure at Loading" @default.
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- W2116804142 doi "https://doi.org/10.1061/9780784479346.040" @default.
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