Abstract：In order to improve the brittleness of high-strength plain concrete(HSPC),the cube and axial compressive tests were carried out for HSPC and high strength steel fibers and carbon nanotubes reinforced concrete(HSSFCNRC),HSPC is transformed into HSSFCNRC by being mixed some carbon nanotubes and steel fibers,the stress-strain curves are achieved and the constitutive equations are also established.The test results show that the failure deformations of prism specimens of HSPC are typical brittle failures;while HSSFCNRC destruction process is belonging to a typical plastic damage.Secondly,the axial-pressure ratios of two kinds of concrete(the ratio of the axial and cube compressive strength) increase with concrete strength increased,but the peak strains,elastic modulus and Poisson's ratios of HSPC are smaller than those of HSSFCNRC.Thirdly,because of the brittleness of HSPC and the limitations of a pressure testing machine,the data on the decline of the stress-strain curves are collected less than the latter,and the latter is much more gentle than the former.These characteristic indexes of the above are illustrated that the steel fibers and carbon nanotubes have effectively improved the brittle failure of HSPC.Thusly,the above results can lay a foundation for relevant engineering applications.

Keyword：high-strength concrete;steel fiber;carbon nanotube;modulus of elasticity;constitutive equation;