ABSTRACT Salt crystallization is known as one of the most important degradation mechanisms effective in the rocks degradation. Degradation occurred by salt crystallization especially effects porous rocks. Beside that, it has also an important effect on fractured and micro-fractured rocks. In this study, the resistances against salt crystallization of a total of 6 different types of tuffs that are used as building materials were determined by using dry weight loss test. Furthermore, their strength changes were determined by using ultrasonic wave velocity measurements. According to the obtained data, salt crystallization has an important degree of effect on the strength of tuffs. Also, changing of the resistance of the tuffs against salt crystallization, according to the petrographic properties of the tuffs and the included alteration zones in them were reported.

ÖZET Tuz kristalle?mesi, kayaçlaryn bozunmasynda etkin olan en önemli bozunma mekanizmalaryndan biri olarak bilinmektedir. Tuz kristalle?mesine ba?ly bozunma, özellikle gözenekli kayaçlar üzerinde etkili olmakla birlikte çatlak ve mikroçatlaklar içeren kayaçlar üzerinde de önemli etkilere sahiptir. Bu çaly?mada, farkly mevkilerden alynan ve yapy malzemesi olarak kullanylan 6 farkly tüfün tuz kristalle?mesine kar?y dirençleri kuru a?yrlyk kayby ve ultrasonik hyz ölçümleri yapylarak belirlenmeye çaly?ylmy?tyr. Elde edilen veriler sonucunda, tüflerin dayanymlarynyn tuz kristalle?mesinden önemli derecede etkilendi?i belirlenmi?tir. Ayryca tüflerin tuz kristalle?mesine kar?y dirençlerinin tüflerin petrografik özelliklerine ve içerdikleri ayry?ma zonlaryna ba?ly olarak de?i?ti?i görülmü?tür.