Investigation of the Effect of Using Epoxy Coatings on Salt Crystallization in Ignimbrite (Nevsehir-Turkiye) Stones

Salt crystallization caused by water absorption in ignimbrites used as building stones is one of the most important factors that cause the deterioration of historical buildings. Salt crystals accumulated in the pores of the stones cause deterioration such as cracks and efflorescence during drying due to the effect of internal pressure. In this study, it is aimed to use epoxy coatings on the surface of ignimbrites found in Nevsehir (Turkiye) and to prevent damage caused by salt crystallization. Epoxy coated (treated) and untreated samples; their resistance to salt was examined by performing water absorption, apparent density, open porosity and salt crystallization experiments with sodium chloride solutions. At the end of the salt crystallization test, it was determined that there was a 6.20% increase in the dry weight of the epoxy coated samples, while there was a 0.82% decrease in the untreated ignimbrite samples. It was observed that the epoxy coating fills the pores in the stones and is more resistant to salt crystallization damage than untreated stones. Since epoxy coatings are effective in protecting the surface of ignimbrites, it has been concluded that they can be used to prevent deterioration of historical buildings caused by salt crystallization.