The crystallization of soluble salts in porous materials is one of the most important weathering processes contributing to the decay of monuments and archaeological masonries. A study on the inhibition effects of citric and phosphocitric acids on sodium sulphate crystal growth in porous stones was carried out. Macroscale experiments showed that the evaporation rate of the solution is markedly increased by the presence of the inhibitors. In the presence of the inhibitors sodium sulphate mainly effloresced reducing, therefore, subefflorescence. Interesting information about the morphology and the salt crystal size inside the pores was obtained by scanning electron microscopy measurements. It is concluded that the salt damage to porous stones due to crystallization appears to be largely reduced by the presence of crystallization modifiers.
Inibitori della crescita di cristalli di solfato di sodio in materiali lapidei.1.
MARROCCHI, Assunta;TATICCHI, Aldo;MINUTI, Lucio;BROGGI, Alessandra
2006
Abstract
The crystallization of soluble salts in porous materials is one of the most important weathering processes contributing to the decay of monuments and archaeological masonries. A study on the inhibition effects of citric and phosphocitric acids on sodium sulphate crystal growth in porous stones was carried out. Macroscale experiments showed that the evaporation rate of the solution is markedly increased by the presence of the inhibitors. In the presence of the inhibitors sodium sulphate mainly effloresced reducing, therefore, subefflorescence. Interesting information about the morphology and the salt crystal size inside the pores was obtained by scanning electron microscopy measurements. It is concluded that the salt damage to porous stones due to crystallization appears to be largely reduced by the presence of crystallization modifiers.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
