Verification of mechanical properties’provisions of existing codes for high-strength concrete

Concrete is one of the most used building materials. In recent decades, achieving high compressive strength in concrete has been the main objective of concrete workers. One of these produced concrete is high-strength concrete which its use is being developed due to the increasing demand for faster utilization of under construction buildings and facilities. High-strength concrete was used in 1965 in Chicago for the first time. High compressive strength , high tensile strength , greater modulus of elasticity , lower permeability , longer durability due to less porosity and high bonding strength between bars and reinforced concrete are benefits of these concrete products . In this paper, our attempt is to investigate the mechanical properties of high-strength concrete with the equations of conventional concrete of the five United states of America , Europe , Canada , Australia and Japan Codes and suggest a suitable relationship by comparing the results of previous investigations .