Materiales de Construcción, Vol 48, No 250 (1998)

Durability of two water repelents applied to granite


https://doi.org/10.3989/mc.1998.v48.i250.475

T. Rivas
Dpto. de Edafología. Univ. de Santiago de Compostela, Spain

B. Silva
Dpto. de Edafología. Univ. de Santiago de Compostela, Spain

B. Prieto
Dpto. de Edafología. Univ. de Santiago de Compostela, Spain

Abstract


The durability of two water-repellents for granitic stonework was determined. Weathered and sound samples of granites widely used in building construction and restoration in Galicia (NW Spain) were treated with water repellents of known efficacy, and then subjected to two artificial weathering tests: prolonged exposure to UV light, and sodium sulphate crystallization cycles. In both tests, but especially in the salt crystallization cycles, both treatments rapidly lost their water-repellency. Furthermore, the hydrophobic layer of water repellent impeded salt mobility, favouring fissuration parallel to the treated surface, which was eventually shed in the form of a plaque.

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