In order to investigate the bond behaviour between the cast-in-place UHPC and the GFRP plate, it was decided to subject the bond interface to two distinct types of load configurations, one under pure shear load and the other under pure tension load. Two different types of specimens were designed for each loading configuration.
Preparation of Bond Interface
The bond interface for all of the specimens tested, for both shear and tension specimens, were prepared in a similar fashion. The bond surface of the GFRP plate was first coarsened using a Grit 60 belt sander followed by manual coarsening using a heavy duty sanding stone. A thin layer of epoxy (approximately 1 mm in thickness) was then applied to the coarsened surface. Coarse silica sand aggregates, with diameters ranging from 4.5 to 9.0 mm, were distributed evenly overtop of the epoxy to achieve an aggregate density of approximately 4 kg/m2. The applied aggregate density is in agreement with experimental results obtained in similar research . The coarse silica sand aggregates were gently pressed downwards onto the GFRP plate to ensure good bonding. The plates with the bonded sand aggregates were allowed to cure undisturbed for 7 days prior to casting of the UHPC onto the bond interface. Figure 1 includes photographs showing different stages during the preparation of the specimens.