Materiales de Construcción, Vol 50, No 257 (2000)

Consolidating and water repellent treatments applied to wet and salt contaminated granite


https://doi.org/10.3989/mc.2000.v50.i257.415

B. Silva
Dpto. Edafología y Química Agrícola. Fac. de Farmacia, Univ. de Santiago de Compostela, Spain

T. Rivas
Dpto. Edafología y Química Agrícola. Fac. de Farmacia, Univ. de Santiago de Compostela, Spain

B. Prieto
Dpto. Edafología y Química Agrícola. Fac. de Farmacia, Univ. de Santiago de Compostela, Spain

Abstract


A comparison was made of the efficacy of two consolidants and two water repellents applied to samples of granite under optimum conditions, with the efficacy of the same products applied to the granite in the presence of soluble salts or water. The amount of product absorbed and the amount of dry polymer remaining after treatment were compared. The results show that the presence of water and soluble salts in the stone significantly modifies the consumption of the products (in particular the water repellents) and also the level of dry polymer retained. The water repellents were found to be much less effective when the substrate contained salts, whereas the presence of water did not appear to influence their efficacy. The lack of correlation between uptake, active dry polymer, and efficacy led to the conclusion that the presence of salts or water markedly changes the kinetics of the polymerization of the products.

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