New nanomaterials for protecting and consolidating stone
Despite the consolidant based on ethyl silicate proves more reactivity than others, measures of cohesion revealed few differences between the products. The concept of the consolidation of materials is introduced to overcome this problem, or at least to reduce its severity. The sandstone is described in more detail in an earlier paragraph. Besides, Zornoza-Indart et al.
As mentioned, consolidant products based on calcium hydroxide nanoparticles are one of the most commonly used nanomaterials in stone consolidation. It is well known that calcium alkoxides react in presence of atmospheric moisture and carbon dioxide to precipitate metal carbonates nano-structured, and alcohols. In this way the consolidant colour can be tailored by changing the oxide particles used as filler. To address these problems several trials have been carried out in recent years to obtain mesoporous consolidating gels.
New Nanomaterials for Protecting and Consolidating Stone
Consolidation is one of the most important conservation treatments carried out on stone heritage. Journal of Nano Research Vol. This limitation has prevented the more widespread use of the sol-gel route for producing monoliths and films.
The ZnO-based systems showed the best antifungal properties against P. Weathering and air pollution compromise the preservation of historic buildings made of stone. As none of the consolidants completely blocked the rock pores, the breathability of the stone after the treatments was only slightly reduced. The effectiveness depends on the type of mortar and humidity conditions to which they are exposed.
However, photocatalytic mortars can be applied in new and old buildings, because the nanoadditives do not compromise the mortar hardened state properties. One of the main factors that have been proven to be the clue to produce the carbonation has been the effect of the relative humidity. Furthermore, Zornoza-Indart et al. Schematic illustrations of self-cleaning processes on untreated and treated stone surfaces.
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