119 The 10 th International Conference of the Slovenian Society for Non-Destructive Testing “Application of Contemporary Non-Destructive Testing in Engineering” September1-3, 2009, Ljubljana, Slovenia, 119-125 ULTRASONIC DETERMINATION OF ELASTIC MODULUS OF MARBLES RELATION WITH POROSITY AND CaO % .H. Sarpün 1 , V. Özkan 2 and S. Tuncel 3 1 Afyon Kocatepe University, Physics Dept. 03100 Afyonkarahisar, Turkey, isarpun@gmail.com 2 Osmangazi University, Physics Dept. 26060 Eski ehir, Turkey, vozkan44@hotmail.com 3 TÜB TAK Marmara Research Center Gebze, Kocaeli, Turkey, Sabri.Tuncel@mam.gov.tr ABSTRACT Since ancient Greek times marble has been used for decoration and for sculpture. In this paper, we have analyzed marble samples, which were selected according to their porosity and the proportion of CaO values, with ultrasonic velocity measurement methods. Elastic modulus was evaluated from longitudinal and transverse velocity of ultrasonic wave propagation in marble samples. Our results indicate that the elastic modulus shows linear dependence to the porosity and the proportion of CaO. The correlation factor of fitted line is about 0.9. Also the longitudinal velocity shows more linearity than the transverse velocity. Keywords: Elasticity, Porosity, Ultrasonic Velocity, Marbles. 1. Introduction Marbles have been used as building stones, tiles and decoration since ancient Greeks. Marble word is used to describe stones that are product of the metamorphism of limestone beds subjected to adequate pressure and/or heat. Marble is a kind of rock consisting basically of crystallized grains of calcite or dolomite or a mixture of them. The colors of marbles result from foreign substances like muscovite and chlorite. Its physical properties depend on the chemical composition, the microstructure and fabric. Ultrasonic testing of marbles has been examined by several researchers [1-6]. Elasticity moduli, shear moduli and Poisson ratio of marbles and concrete have been determined by ultrasonic waves under varied pressure [1]. Similar work has been done by Vardoulakis [2] and the values obtained from ultrasonic non-destructive testing have been compared with values of destructive testing. Porosity – ultrasonic velocity relation has been studied in volcanic rocks under varied pressure [3]. Mean grain size determinations of marbles have been obtained by ultrasonic velocity and ultrasonic