There are several factors affecting the results of the slake durability test which defines the disintegration of clay-bearing rocks through wetting and drying cycles as well as slaking behavior in water. These factors include angularity of the test specimens and structural properties of the rock material. This study aims to assess the effects of these factors on the results of the slake durability test. The materials selected for this purpose include clay bearing, rocks such as clayey sandstone, marl, clayey limestone, tuff, and weathered granite. Angular, subangular and rounded specimens were prepared from each rock type and subjected to the slake durability test. The results of the Wake durability tests indicate that angularity effects the slake durability index (ld2) values of the rock groups without any micro discontinuity. The ld2 values of these types of rocks show differences as high as 26% depending on the aggregate angularity. For the rock groups with micro discontinuities, disintegration was observed at the end of the second cycle for each group and it was concluded that the aggregate shape has no significant effect on the ld2 value of these rock. The regression analyses conducted to determine multi-cycled slake durability index via single-cycle slake durability index for the rock types used in the study indicate a strong statistical relationship. High average absolute error values occurred between experimentally and empirically defined ld values as a function of l6(50) and γd.