smaller sized coarse aggregate produces higher strengths for a given water-to-cement ratio. In fact, it is generally agreed that, although larger coarse aggregates can be used to make high-strength concrete, it is easier to do so with coarse aggregates below 12.5 mm (Y, in.) (ACI 363-95). legislation governing the main marine extractive industries (i.e. aggregate mining) may be extremely complex and governed in part by or subnational national authorities (Radzevicius et al., 2010).