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Experimental characterization of the interstitial pore pressure of wet concrete under high confining pressure

Abstract : The main objective of this PhD thesis is to identify experimentally the interstitial pore pressure of a very wet concrete under high confining pressure. This work is a part of a more general project aiming to understand the concrete behavior under impact during which, a high triaxial stress states occurs. Besides, massive concrete structures keep a saturation ratio strongly depth dependent almost their life time. The quantity of free water contained in concrete pores has a preponderant role on its behavior under high confinement compare to other material parameters (e.g: water/cement ratio or the concrete porosity). Under such loading, porosity closure occurs and causes an increase of interstitial pore pressure which is never measured.In order to perform interstitial pore pressure measurement, two configurations issued from a new testing technic have been developed using the Giga press of 3SR Lab. The technic, detailed in the first two chapters, consists in replacing the 14 cm R30A7 reference concrete sample by a smaller one with a water collect cap below it. The latter is composed of two parts: a movable plug equipped by a sealing joint permitting the access into the cap free space, and a micro-holed cap which is accosted on the concrete sample. A deformable sensor is placed into the free space of the water collect cap. Thus, when the sample is pressurized at high confinement, the interstitial water inside the concrete is transmitted to the sensor through cap micro-holes. The design, protection and calibration of each sensor are discussed.The second part of this thesis is dedicated for pore pressure analysis results. This latter seems to reach high values ranging from 250 till 400 MPa for 500 MPa of confinement. The concrete volumetric behavior under drained condition is lower than the saturated concrete under undrained condition. The collected data reveals that pore pressure increases linearly with the confining pressure within a slope of 0.7.An analytical modeling, within the poro-mechanical framework, is developed in order to estimate the pore pressure and concrete volumetric behavior under high confinement. The model shows promising results while comparing it to the experimental values
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Submitted on : Monday, September 3, 2018 - 3:44:12 PM
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  • HAL Id : tel-01866716, version 1

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Abdallah Accary. Experimental characterization of the interstitial pore pressure of wet concrete under high confining pressure. Chemical and Process Engineering. Université Grenoble Alpes, 2018. English. ⟨NNT : 2018GREAI040⟩. ⟨tel-01866716⟩

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