In the present study, the consolidation effectiveness of some inorganic nanoparticles dispersions (silica, calcium hydroxide, and strontium hydroxide) has been evaluated when applied on a very porous stone substrate, i.e., Lecce stone. The strengthening effect of the nanoparticle- based treatments was compared to that exhibited by the well-known consolidant tetraethoxysilane. Ca(OH)2 and Sr(OH)2 nanoparticles were prepared in laboratory and characterized by scanning electron microscopy (SEM), energy- dispersive X-ray spectroscopy (EDS), dynamic light scat- tering (DLS), and Fourier transform infrared spectroscopy (FTIR). The kinetic stability of nanoparticles dispersions was determined by UV-vis spectrophotometric studies. Moreover, the study of the nanolime carbonatation process was carried out using FTIR spectroscopy. Distribution of the applied product into the stone substrate was examined by SEM-EDS. The chemical weathering effect of salt crys- tallization of the treated specimens was evaluated by per- forming the dry weight loss (DWL) test. All the results suggested that Ca(OH)2 and Sr(OH)2 nanoparticles, applied as 2-propanol dispersions, display some good properties as consolidating agents for a very porous bio-calcarenite such as Lecce stone.
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