Comportamento Flessionale di Lastrine a matrice cementizia con rinforzi ibridi

Recently, the interest in the use of high performance cement-based materials (HPC) has been increased due to the need to intervene on existing buildings no longer meeting the structural and seismic requirements imposed by the revised national codes. A retrofitting strategy that might be successfully adopted in precast structures is represented by the substitution of the unsafe roofing elements with innovative composites characterized by lightness and high structural performances. The significant self-weight reduction might play a positive role on both the static and the dynamic building behavior. The paper investigates the flexural response of three sets of cement-based plates (400 mm long, 70 mm wide, 15 mm thick); the first set was reinforced with unoriented high carbon steel microfibers, the second one with two layers of glass fabrics and the third one with a combination of steel fibers and textiles. Performing four point bending tests, it was find out that the combination of high-carbon steel microfibers and alkali-resistant glass textiles (hybrid reinforcement) is capable of increasing the structural performances in terms of tensile strength, ductility and crack pattern.