Marine Aerosol Weathering of Mediterranean Calcarenite Stone: Durability of Ethyl Silicate, Nano Ca(OH)2, Nano SiO2, and Nanostructured Consolidating Products. (17th February 2019)

• Record Type: Journal Article
• Authors: Zornoza-Indart, Ainara; Lopez-Arce, Paula; Zoghlami, Karima; Leal, Nuno; Simão, Joaquim
• Is Part Of: Studies in conservation. Volume 64:Number 2(2019)
• Page Start: 73
• Page End: 89
• Publication Date: 2019-02-17
• Subjects: Sandstone -- marine aerosol weathering -- durability -- ethyl silicate -- nano Ca(OH)2 -- nano SiO2 -- nanostructured consolidating products; Art objects -- Conservation and restoration -- Periodicals; 700.288
• DOI: 10.1080/00393630.2018.1477654
• Languages: English
• ISSNs: 0039-3630

Abstract

ABSTRACT: Calcarenite stone samples from a historic building (Bizerte, Tunisia) were collected and treated under different environmental conditions with several consolidating products: alkoxysilane (ethyl silicate), a surfactant-templated novel sol–gel, Ca(OH)2, and SiO2 nanoparticles. These were subjected to marine aerosol accelerated aging cycles and studied by several non-destructive tests and techniques to assess the stability of the products. Results show that weathering caused by salt crystallization is not inhibited but it is slowed down due to the enhancement of superficial mechanical properties (surface cohesion and micro-hardness) achieved after one month of treatments application. A high or low relative humidity of the consolidation environment significantly affects the final mechanical and aesthetical physical properties and therefore conditions the durability of the treated substrates, even producing higher damage than observed in the blank specimens, depending on the product.