Uniaxial tension– Compression behaviour of the UHPFRC using GGBS

Abstract

The purpose of this study was to investigate the mechanical characteristics of Ultra-High Performance Fibre Reinforced Concrete (UHPFRC) under compression uniaxial loading conditions, using waste in the mixture. UHPFRC is a class of cementitious material with high durability and strength, limited to a minimum value of compressive strength of 150 MPa. The difference with traditional concrete lies mainly in the post-peak behaviour that occurs due to the presence of fibres, which are responsible for ensuring the ductile behaviour of the material. Uniaxial compression tests on twenty cylindrical specimens were carried out and tested after 28 days of curing, with a percentage of steel fibres of 1% at a displacement loading speed of 0.5 mm/min. The mixture design that was used allowed to manufacture a thixotropic material, characterized by a compressive strength and an average modulus of elasticity of 150.89 MPa and 47.71 GPa respectively. A simple production process was used, including Ground Granulated Blast Furnace Slag (GGBS) as the main sustainable material and as partial substitute for cement. Curves for design and structural analysis were plotted and compared with the average experimental curve and with other research consulted in the literature, including the elastic and inelastic behaviour of the material.