Characterisation of Steel Fiber Reinforced Concrete: Ductility and Service Life

Abstract

Plain concrete is a brittle material with low tensile strain and strength capacities. Steel fiber reinforced concrete (SFRC) has gained prominence as an innovative construction material, offering improved tensile and flexural properties over conventional concrete. Singapore Standards, “SS 674: Fiber concrete- Design of fiber concrete structures” just launched recently to offers a comprehensive structure for enhancing comprehension of Fiber-Reinforced Concrete. This study presents a comprehensive characterization of SFRC, focusing on both its mechanical properties particularly residual strength. Following this, a series of experimental works are conducted to assess the residual tensile strength under flexural loading behavior of SFRC specimens. Examining the tensile strength and residual strength of SFRC to assess its material strength and behaviour after being subjected to a load will help engineers comprehend the material's strengths and weaknesses. At 40 kg/m³ fibers content shows an increase of residual strength with a strain hardening behaviour observed as compared to the 20 kg/m³ and 30 kg/m³ fibers content.  In conclusion, this study offers a holistic characterisation of SFRC, encompassing mechanical properties with higher residual strength. The outcomes provide scientific understanding and practical insights of SFRC for engineers and practitioners seeking to optimise the use of SFRC to enhance structural longevity and reduce maintenance costs.