Low-grade RC beams strengthened with TRM composite based on basalt, carbon and steel textiles: Experimental and analytical study

This study develops an easy-to-conduct numerical calculation method to assess the effect of Textile Reinforced Mortar when used as externally bonded flexural strengthening technique in low-grade reinforced concrete beams from ancient structures (aged between 60 and 100 years old). Using materials main mechanical characteristics dimensions inputs, model defines behaviour strengthened elements. paper includes experimental characterization whole solution, constituent composite pure tensile scaled flexure. In total three different – basalt, carbon steel cords are inner reinforcement. Tests carried out on sixteen that reproduce low-quality concretes with a compression strength below 17 MPa and, general, poor properties, those present old decayed structures. campaign two other particular features adopted retrofitting technique: ratio use anchorage system. The obtained findings assessed satisfactorily compared developed approach, leading us conclude is effective solution for made terms increasing their deformation load-bearing capacity under loads (the maximum bending moment has increased 30% 200%). Besides, failure mechanism due undesired premature detachment was effectively countered using U-shaped anchors, failing failure.