Sixty high performance concrete cylinder specimens with different confining pressures and concrete strengths were designed for conventional triaxial compression tests to study the mechanical properties under triaxial stress.The results showed that longitudinal splitting and oblique shear failure occurred under uniaxial and triaxial compression respectively.The stress-strain curve of specimens could be divided into three stages:elastic rising section,plastic rising section and softening falling section.The softening falling section is smoother than that of uniaxial compression,showing an increase in ductility.With the increase of lateral pressure,the elastic modulus,peak stress and peak strain of specimens increased significantly.Finally,the calculation formula between lateral pressure and peak stress,peak strains were established by the least square method.
high performance concreteconventional triaxial testsfailure characteristicsmechanical properties
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