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Open AccessFeature PaperArticle

Design and Evaluation of a Deformable Sensor for Interstitial Pore Pressure Measurement in Concrete under Very High Stress Level

Université Grenoble Alpes, CNRS, Grenoble INP, 3SR, 38000 Grenoble, France
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Appl. Sci. 2019, 9(13), 2610; https://doi.org/10.3390/app9132610
Received: 19 May 2019 / Revised: 19 June 2019 / Accepted: 21 June 2019 / Published: 27 June 2019
(This article belongs to the Section Civil Engineering)
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Abstract

Previous studies have shown the strong influence of free water saturation ratio on the triaxial behavior of concrete at high confinement. This influence of the free water is usually attributed to a pore pressure effect. This article presents an experimental method aiming at measuring the pore pressure of free water into concrete samples under very high mean stress. Two types of deformable pressure sensors were designed and tested. The first one works in hydrostatic compression while the second one acts as a flexible membrane. The two sensors give comparable results and show that pore pressure may reach several hundred MPa in saturated concrete sample under a maximum 400 MPa hydrostatic compression. Such levels of pressure may explain the loss of shear strength and increase in volumetric stiffness observed on the macroscopic behavior of concrete due to the presence of free water. View Full-Text
Keywords: pore pressure; sensor; design; experimental method; high confinement; concrete pore pressure; sensor; design; experimental method; high confinement; concrete
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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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MDPI and ACS Style

Accary, A.; Malecot, Y.; Daudeville, L. Design and Evaluation of a Deformable Sensor for Interstitial Pore Pressure Measurement in Concrete under Very High Stress Level. Appl. Sci. 2019, 9, 2610.

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