AbstractStudying the characteristics and evaluating the condition of bricks and plasters of the external masonry, belonging to historical buildings known as Fabbrica Vecchia and Marchesato, located in Marina di Ravenna at the entrance of the ship canal which links Ravenna to the Adriatic Sea, the problem of the determination of the soluble salts content has been tackled. A cause of deterioration of bricks and plasters is the presence of soluble salts, originated from air pollution, capillary raising of solutions and marine aerosol. In the examined case, the soluble salts are composed mainly of halite and gypsum. It has been observed that the differential thermal analysis (DTA) and the themogravimetric analysis (TGA), besides giving information about alteration and deterioration of the above said materials, point out well the presence of gypsum and halite and allow their quantitative assessment, through data obtained from TGA. The comparison with a chemical method of analysis (ion chromatography) of such soluble salts has lead to the conclusion that the determination of their content through TGA is preferred because it is a direct method, with a good precision level.
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