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

Çalışkan, Berkay Barış
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.


Tanideh, Gelareh; Tavukçuoğlu, Ayşe; Saltık, Emine Nevin; Department of Architecture (2022-2)
The focus of the study is to uncover whether the treatment of autoclaved aerated concrete (AAC) surface with alcohol dispersion of calcium hydroxide Ca(OH)2 nanoparticles controls its high water absorption properties to some extent or not. AAC as a lightweight and porous concrete material, is well-known for its high breathing and thermal resistivity features while it suffers from high water absorption and capillary suction in exposed conditions. Laboratory analyses were conducted on four types of AAC, used ...
Fabrication and characterization of porous hydroxyapatite and biphasic calcium phosphate ceramic as bone substitutes
Koc, N; Timucin, M; Korkusuz, Feza (2004-01-01)
In the present study, the calcium phosphate powders (HAP, HAP-TCP) were produced by a precipitation technique involving the use of aqueous solutions of calcium nitrate and diammonium hydrogen phosphate. Preforms of calcium phosphate ceramics were produced by using a modified slip casting technique. Porosity in the cast and in the sintered ceramic was obtained through custom made PMMA beads similar to200-300 mum size. The green ceramic samples were prepared by suspending the apatite powder and PMMA beads in ...
Microwave assisted synthesis of La-1 (-) xCaxMnO3 (x=0, 0.2 and 0.4): Structural and capacitance properties
Tabari, Taymaz; Singh, Dheerendra; Calisan, Atalay; Ebadi, Mehdi; Tavakkoli, Haman; Caglar, Basar (2017-12-01)
The effect of calcium incorporation on the physicochemical and electrochemical properties of the LaMnO3 (LM) perovskites was studied via several techniques. Moreover, a new microwave assisted method was used to synthesize La(1-x)Ca(,)M(x)nO(3)(LCM) perovskites with various calcium content (x = 0.2 and 0.4). Then, the physicochemical properties of the materials such as crystal structure, particle size, surface area, reducibility and band gap energy were investigated by X-ray Diffraction (XRD), High resolutio...
Bioflocculation of activated sludge: The role of calcium ions and extracellular polymers
Sanin, Faika Dilek (Informa UK Limited, 2000-12-01)
In an attempt to identify the bioflocculation mechanisms, this study examines the role of calcium ions in flocculation of activated sludge. Two calcium specific chelants, ethylenebis (oxyethylenenitrilo)tetraacetic acid (EGTA) and sodium hexametaphosphate (HMT) are used to extract calcium ions. Both chemicals successfully extract the calcium ions from sludge structure, which is confirmed either by an increase in solution calcium concentration or by a decrease in calcium concentration in the sludge solid mat...
ZHU, J; Karakaya, İshak; THOMPSON, WT (The Electrochemical Society, 1988-01-01)
To further the understanding of electrolytes of value in industrial magnesium electrolysis, the reversible emf for the formation of in fused salts containing and was studied. The data made possible the calculation of thermodynamic solution properties which were used with other data to construct features of the ternary phase diagram. The multiple discrete complex anion (MDCA) model was tested against the thermodynamic findings from the present study. Reasonable agreement was obtained between the experimen...
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.