In this study, Slake durability index test (SDI) values have been determined on sphere and rounded test samples preparing to massive marl. A new sample preparation method called Pasha Method was used to prepare sphere samples from the massive marl blocks collected from Tuncbilek lignite mine in Kütahya, Turkey. The SDI tests were performed on equal weight sphere test samples and rounded test samples with balanced charge. The SDI values were determined for the three different groups subjected to the SDI test for 12 cycles. The index values of the massive sphere test sample group were found to be higher than the index values of rounded test sample groups having balanced charge. As a result, such a study can be complement and development for slake durability index.
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