Mechanical properties of the concrete containing ferronickel slag and blast furnace slag powder.

• F-S concrete presents identical mechanical properties to conventional concrete. • The stress-strain curve characteristics were mainly related to F-S concrete strength. • The stress-strain constitutive equations were established for F-S concrete. This study investigated the mechanical properties of concrete of strength grade C30 and C35, containing different content (10%–50%) of a composite admixture of ferronickel slag and blast furnace slag powder (referred to as F-S powder and F-S concrete hereafter, respectively). The mechanical properties include axial compressive strength, elastic modulus, Poisson's ratio, splitting tensile strength, and the compressive stress-strain relationship. The difference in mechanical properties between F-S concrete and conventional concrete was analyzed. Test results indicated that the positive correlation of conventional concrete between the axial compressive strength, elastic modulus, splitting tensile strength, and cubic compressive strength was applicable to F-S concrete irresponsible of the specific F-S powder content. Both Poisson's ratio and the failure mode under compression for F-S concrete were identical to those of conventional concrete. The shape characteristics and fitting parameters of the stress-strain curve were mainly related to F-S concrete strength grade but had little connection with the specific F-S powder content. Furthermore, based on tested data, the stress-strain constitutive equations were established for F-S concrete, which provides a reference for the test analysis of large specimens and corresponding engineering application. [ABSTRACT FROM AUTHOR]