Dynamic testing of concrete under high confined pressure. Influence of saturation ratio and aggregate size
1 Laboratoire Sols, Solides, Structures et Risques, Université Grenoble Alpes, BP. 53, 38041 Grenoble Cedex 9, France
2 Laboratoire de Mécanique des Solides, Ecole Polytechnique, 91128 Palaiseau, France
a Corresponding author: firstname.lastname@example.org
Published online: 7 September 2015
Concrete structures can be exposed to intense pressure loadings such as projectile-impact or detonation near a concrete structural element. To investigate the mechanical behaviour of concrete under high confining pressure, dynamic quasi-oedometric compression tests have been performed with a large diameter (80 mm) Split Hopkinson Pressure Bar apparatus. The concrete sample is placed within a steel confining ring and compressed along its axial direction. Hydrostatic pressures as high as 800 MPa and axial strain of about − 10% are reached during the tests. In the present work, experiments have been conducted on two types of concrete: MB50 microconcrete with a maximum grain size of 2 mm and R30A7 ordinary concrete of maximum grain size about 8 mm. Both concretes are tested in dry or saturated conditions. According to these dynamic experiments it is noted that grain size has a small influence whereas water content has a strong effect on the confined behaviour of concrete.
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