Deformation mechanism of hardened cement paste under high stress and application of flow law
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Keywords

Cement paste
Triaxial test
Flow law
Dislocation creep

How to Cite

Sakai, Y. (2019). Deformation mechanism of hardened cement paste under high stress and application of flow law. Journal of Asian Concrete Federation, 4(2), 78–88. https://doi.org/10.18702/acf.2019.1.4.2.79

Abstract

In this study, a creep test was performed on hardened cement paste (HCP) with stepwise load increase at different confining pressures and saturation degrees. The strain rate–stress relationship, obtained under a stress of >75% of the maximum strength and plotted on a log–log chart, showed a slope of six. From previous studies on crystalline materials, such as rock, metal, and ice, it can be inferred that this slope indicates a deformation governed by dislocation creep. If dislocation creep occurs in HCP, the deformation may be governed by crystalline hydrates other than calcium silicate hydrate (C-S-H) because dislocation creep is generally not defined for gel materials. Further study and careful discussion are required because a slope of six is a necessary condition for the dislocation creep. The activation volume was evaluated, and the flow law was applied to calculate the strain rate of HCP. The obtained activation volume gives a better fit for the measured results than the previously reported values.

https://doi.org/10.18702/acf.2019.1.4.2.79
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Copyright (c) 2024 Yuya Sakai

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