Inhibition of swelling clays and consolidation of Itararé Sandstone using diaminoalkanes (DAA) and ethyl silicate (TEOS)

The conservation of stones containing swelling clay minerals such as montmorillonites is a challenging task. In this context, inhibitors (DAA) were tested and treatment based on consolidation with TEOS (ethyl silicate) was carried out sandstone minerals: the Itararé Sandstone (commercial name). laboratory experiment, inhibition swelling, pore size distribution, capillarity, colorimetric alteration, durability treatments against action water, effectiveness consolidation, penetration depth evaluated. Swelling effective in inhibiting from swelling. consolidant, despite its effectiveness, altered distribution water absorption significantly, forming very cracked gel, darkening stone, reducing resistance to presenting small depth. When applied before also occurred, porosity less altered, consolidant cracked, there chromatic modification sample became more resistant water. Therefore, proved be fewer changes physical characteristics stone than sole application consolidant.