Evaluation of nanoparticulate consolidants applied to Novelda Stone (Spain)

Abstract

The main objective of this work is to test several nanoconsolidant treatments (pure Nano Estel, 1:1 diluted Nano Estel and Tecnadis ZR-110), with the aim of improving the intergranular cohesion of the Novelda Stone. The treatments were applied in laboratory by capillary suction and their effectiveness and depth of penetration have been evaluated on the basis of the petrophysical characteristics of the stone (petrography, elemental physical properties, hydric properties and ultrasound propagation), before and after consolidation. Subsequently, in order to estimate the durability of the treatments, accelerated ageing tests (salt crystallisation, freeze-thaw and wet-dry) were carried out. According to the results, we can conclude that none of the treatments is suitable for the treatment of Novelda stone. However, we consider that with further in-depth study Tecnadis ZR-110 could offer good results.

Evaluation of Eco-Friendly Consolidating Treatments in Pugliese Tuff (Gravina Calcarenite) Used in Italian Heritage Buildings

“…For many decades, there has been great concern about the conservation of built heritage, which has led numerous researchers to work on these issues by developing and testing numerous consolidating treatments. In general, there is a high consensus regarding the improvements obtained by porous calcarenites when applying consolidating treatments [28,[30][31][32][33][34]. However, even after having carried out tests prior to application, notable failures have been observed in the use of consolidating treatments, such as the use of some resins, polymers [35,36], or magnesium and/or zinc fluosilicates.…”