Pull-off tests are significant to determine the tensile strength of
the FRCM composite after the material has been applied to a surface.
The tests were performed on specimens of FRCM bonded to
the surface of a clay single brick according to EN 1542 [32]. The
mechanical characteristics of the bricks are reported in the first
part of Chapter 7. The test specimen is formed by drilling a shallow
core perpendicular to the surface and leaving the core attached to
the brick. This had a depth of 10 mm. A steel disk was attached to
the external surface of the core using epoxy adhesive. A tensile
loading device was applied to the test specimen coincident with
the axis of the specimen. The steel disk had a nominal diameter
of 50 mm and a thickness of 25 mm.
The failure mode can occur: