Dynamic testing of concrete under high confined pressure. Influence of saturation ratio and aggregate size

• Published in: EPJ Web of conferences 2015-01, Vol.94, p.1071
• Main Authors: Forquin, P., Piotrowska, E., Gary, G.
• Format: Article
• Language: English
• Subjects: Axial strain; Compression tests; Concrete; Concrete structures; Confining; Detonation; Dynamic tests; Engineering Sciences; Grain size; Mechanical properties; Mechanics; Mechanics of materials; Moisture content; Solid mechanics; Split Hopkinson pressure bars; Structural mechanics; Structural members
• ISSN: 2100-014X; 2101-6275; 2100-014X
• DOI: 10.1051/epjconf/20159401071

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.