STONE DURABILITY OF A SURFACTANT-SYNTHESISED ALKOSYLANE CONSOLIDANT ON GRANITES WITH DIFFERENT MINERALOGY AND TEXTURE
Document Type: Original Article
Pozo-Antonio, J.& Alonso-Villar E.
Enxeñaría dos Recursos Naturais e Medio Ambiente dept., Escola Superior de Minas, Universidade de Vigo, Vigo, Spain.
The aim of this study was to evaluate the durability of the surfactant-synthesised alkosylane consolidant UCA-2o, applied in two granites from the NW Iberian Peninsula (Albero and Rosa Porriño) with different mineralogy and texture. The consolidated samples were subjected to 20 wetting/drying cycles. Then, results obtained in the consolidated samples by a multi analytical approach(peeling test, optical microscopy, colour measurements in CIELAB colour space, static contact angle, roughness measurements and scanning electron microscopy) were compared with those from unconsolidated samples also subjected to the same number of cycles. In summary, after aging, satisfactory results were still identified in terms of surface cohesion. Moreover, both granites showed hydrophobic behaviours. Colour variations in comparison to unconsolidated surfaces showed different trends depending on the texture of each granite: Rosa Porriño with narrower surface fissures has experienced a higher global colour change in comparison to the most porous Albero, due to the yellowing of the consolidant layer, which was more extensive on the surface of the former.
Stone conservation Consolidation Granite Wetting/drying cycle Cultural heritage
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