Abstract
The study under auspices of the BE-sTrONG project examined concretes with low cement content (higher w/b) with hydrophobic admixtures from Polyhedral Oligomeric Silsesquioxanes (POSS) and Rapeseed Oils (RO), containing 50% of clinker and 50% of either ground granulated blast furnace slag or natural volcanic pozzolan, against market’s references in marine environment. The investigated admixtures showed reduction of chloride intrusion and permeability, especially RO, against the references (w/b 0.40) corresponding to almost 30% less w/b. RO, however, causes reduction in compressive strength, which yet may be confronted adjusting its composition.