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Based on an extensive experimental program,the paper studies the behavior of HPFRCC under triaxial compression. The experimental parameters are lateral confining pressure and PVA fiber content by volume. The test results indicate that ultimate strength and peak strain are significantly improved with the increases of confining pressure. The confining effect introduced by the fibers becomes minor in triaxial compression tests,where there is relatively high external confining pressure. The axial stress-strain curves with different confining pressure and different PVA fiber content by volume are obtained. Lateral confining pressure constraints the lateral expansion of HPFRCC,so there is a big plastic deformation with its ultimate strength improved. At lower confining pressure,PVA fiber content by volume has some effect on the decreased section of stress-strain curve. According to test results,the paper establishes formula of confining pressure with ultimate strength and axial peak strain respectively.
Based on an extensive experimental program, the paper studies the behavior of HPFRCC under triaxial compression. The experimental parameters are lateral confining pressure and PVA fiber content by volume. The test results indicate that ultimate strength and peak strains are significantly improved with the increases of confining pressure. The confining effect introduced by the fibers becomes minor in triaxial compression tests, where there is relatively high external confining pressure and the different PVA fiber content by volume are obtained. Lateral confining pressure constraints the Lateral expansion of HPFRCC, so there is a big plastic deformation with its ultimate strength improved. At lower confining pressure, PVA fiber content by volume has some effect on the decreased section of stress-strain curve. According to test results, the paper established formula of confining pressure with ultimate strength and axial peak strain r espectively.