Mechanical investigation of two fiber-reinforced repair mortars and the repaired system

The mechanical behavior of two repair mortars was investigated. The first one is a fiber reinforced lime-based mortar, which contains thickening agent and limestone additions. The second one is a fiber reinforced ordinary mortar, which contains a small quantity of silica fume and additives. Mechanical characterization was based on compression, tensile and three-point bending tests. The bond between the repair mortars and substrate was investigated by slant shear and flexural bonding tests. The results obtained have demonstrated the influence of the surface roughness and moisture conditions on the bond strength. Finally, Scanning Electron Microscopic observations have showed the morphology of the repair mortar-to-substrate interfacial zone.