ABSTRACT
Modern admixtures, enhanced fiber performance, and optimized concrete mixes are driving the increased use of sprayed steel fiber reinforced concrete (S-SFRC) in structural applications, particularly in underground construction. S-SFRC enables the construction of permanent tunnel linings without traditional reinforcement, reducing construction time, especially in sections with complex geometry. Ensuring the performance requirements for permanent S-SFRC tunnel linings requires reliable and representative mechanical characterization. This conference contribution presents results from an experimental program aimed at developing an S-SFRC mix that consistently achieved the 3c strength class (Annex L, EC-2) by analyzing the strength class obtained via Method B of EN 14488-3. Sprayed panels were produced to evaluate the mechanical performance of S-SFRC with 40 kg/m³ of steel fiber. Valuable data for the use of S-SFRC as permanent tunnel linings was obtained and analyzed herein.
