MIX DESIGN OF VERY HIGH STRENGTH STEEL FIBER REINFORCED CONCRETE (VHS SFRC) FOR TUNNEL LINER

摘要

This paper presents, in the particular case of high loaded tunnel liners, the mix design of a VHS SFRC based on adapted mechanical analysis and mix proportioning approach. This concrete satisfied the requirements of compressive strength, flexural strength, punching shear strength, ductility and workability. At 28-day age, it achieved a compressive strength of 141 MPa, a modulus of rupture of 19 MPa, and an equivalent splitting tensile strength in punching shear test of 16 MPa.