The most important pathological manifestations in the concrete blocks of the armed masonry are the efflorescence and the fissures; the former are aesthetic and the latter are structural. These pathologies are caused by the porosity of the block; which facilitates the entry of salts from the sea breeze and salt mist present in the marine atmosphere. These salts, as a result of the wind are dragged and deposited in homes built outside the sea. A solution to this problem is to use a material that minimizes the progress of fissures and cracks, such as sugar beet nanoplatelets (BNP); which are plant residues from the food industry. In the present investigation the study of cracked concrete blocks is approached, studying some mechanical, physical and chemical properties; the results show that with the addition of BNP the compressive strength increases, and the absorption and carbonation decrease when compared to concrete without nanoadditive.