Steel fiber reinforced polymer (SFRP) and steel fiber reinforced grout (SFRG) have emerged as promising and cost-effective technologies for the external strengthening of RC structures. Although the first studies date back to 2004, so far the literature related to the flexural strengthening of RC slab/beams with steel fiber sheets is rather limited. As a result, the application of such materials on a real structural member may be discouraged and, conversely, the use of carbon/glass FRP alternative systems may be preferred. The study presented in this paper contributes to filling this knowledge gap by presenting the preliminary results of 10 four-point bending tests performed on RC slabs externally strengthened with SFRG/SFRP systems. Test results have provided valuable information in terms of maximum forces, deformability and failure modes by varying the number of layers and the density of steel fiber tape. Furthermore, it was observed that the effectiveness of the SFRG system was not reduced by applying the strengthening system from the bottom, after having placed two slabs on a scaffold (at an height of about 1.80 m from the floor), in order to simulate the typical working operations found in the field.
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