Most notably, the majority of tests have been undertaken on clay brick substrates, carbon FRPs and externally-bonded retrofits.
Three types of porous brick substrates and one stone material were chosen and investigated regarding chemical and mineralogical composition, textural and surface (roughness and microhardness) properties.
An experimental program was developed using six different small scale specimens with traditional bricks as substrate, rendered on both sides with several optimized render systems.
Results from the species richness surveys show that diversity was significantly increased with the application of an AM fungal treatment and that overall, results suggest that brick-based substrate blends are most effective for vegetation performance as are deeper depths (although this varied with time).
Different bond lengths were analysed in double shear bond tests, using clay brick walls as substrate, so as to evaluate the influence of the bond length depending on the reinforcement system used.
Bond behavior between masonry and FRP was investigated in the present paper; in particular, its numerical modeling was carried out considering both single bricks and masonry prisms (with presence of mortar joints between the bricks) as possible substrate.
Different percentages of organic matter (green waste compost: 0%, 10%, 25 %, 50 by volume) were added and mixed well with a commercial green roof substrate (crushed brick base, containing less than 4% organic matter).
All treatments supported a similar plant biomass, but treatments with a high proportion of crushed brick in the growth substrate supported richer assemblages, with more species able to seed, and a smaller amount of Sedum acre.
The shear bond behaviour, which is crucial for the effectiveness of most applications, was then investigated on strong and weak concrete, tuff, clay brick and brick masonry substrates, providing information on bond strength, failure mode, load-slip response and effective transfer length.
