Performance evaluation of Cappadocian tuffs treated with alcohol dispersion of calcium hydroxide nano-particles

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2022-12-08

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Çalışkan, Berkay Barış

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In this study, the effect of treatment with alcohol dispersion of calcium hydroxide Ca(OH)2 nanoparticles on controlling excessive water absorption and capillary water suction properties of Cappadocian tuffs was investigated extensively. For this purpose, two tuff types, Göreme Rock (CYT) and Cappadocian Rose (CPT), obtained from a quarry near Avanos-Nevşehir, were examined. Laboratory tests were conducted concerning their basic physical, hygric, mechanical, microstructural, and mineralogical properties before and after treatment, to evaluate the effect of the treatment by alcohol dispersion of calcium hydroxide Ca(OH)2 nanoparticles on Cappadocian tuffs. According to the achieved data, both CYT and CPT tuffs are lightweight, highly porous, and highly water vapor permeable building stones falling into the range of weak rocks. Moreover, these tuffs are highly water-absorptive building materials due to the presence of fine and capillary pores in high amounts. Since tuffs with high moisture content are more prone to degradation cycles, these materials should be avoided from water-saturated conditions. In this regard, to improve the hygric properties of tuff surfaces by lowering the water suction and penetration to a certain extent, alcohol dispersion of Ca(OH)2 nanoparticles was applied on their surfaces by capillary suction. The Ca(OH)2 nanoparticles penetrated the fine pores and capillaries of CYT and CPT were observed to form nano calcite (CaCO3) crystals in the porous matrix. It was revealed that the treatment with alcohol dispersion of Ca(OH)2 nanoparticles is promising and compatible as a surface treatment to control CYT and CPT tuffs’ excessive water absorption characteristics by reducing effective and fine porosity while maintaining basic physical, mechanical, and breathing properties.

Subject Keywords

Cappadocian tuffs, Alcohol dispersion of Ca(OH)2 nanoparticles, Surface treatment, Hygric properties, Capillary water suction

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https://hdl.handle.net/11511/101292

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

B. B. Çalışkan, “Performance evaluation of Cappadocian tuffs treated with alcohol dispersion of calcium hydroxide nano-particles,” M.S. - Master of Science, Middle East Technical University, 2022.