EXPERIMENTAL STUDY ON STRENGTH AND DEFORMATION OF REACTIVE POWDER CONCRETE UNDER TRIAXIAL COMPRESSION

Reactive powder concrete possesses excellent properties such as ultra-high strength, high toughness, and high durability etc. Failure criterion of triaxial compression is necessary to safety design of reactive powder concrete members under triaxial compression stress state. The phi 50x100 mm cylinders fabricated with reactive powder concrete was tested under triaxial compression with 0MPa, 20MPa, 40MPa and 60MPa confining pressures respectively. Failure modes and complete axial stress-strain curves were obtained. Results indicate that: 1) the failure modes of specimens with the different confining pressures were similar to that of uniaxial compression; 2) the crack width was decreased with increasing confining pressures; 3) the axial compression strength and axial strain corresponding to compression strength were increased with increasing confining pressure. With obtained results, the practical failure criterion of reactive powder concrete under triaxial compression was proposed. It is important to safety design of reactive powder concrete members under the stress state of triaxial compression.