Slake Durability Test Apparatus
Product Code : EL-RTLE-10507
Quick Answer: The Slake Durability Test Apparatus assesses the deterioration of rocks, particularly shale and similar soft rocks, over repeated wetting and drying cycles by tumbling samples in mesh drums through water and oven-drying them for two cycles, with the percent loss of mass expressed as the slake durability index. It comprises a motorised drive unit, mounted on a baseplate, that rotates two or four drums (140 mm dia x 100 mm long, 2.00 mm mesh) at 20 r.p.m., with tank assemblies filled with water to a level 20 mm below the drum axis.
This test method has been developed to assess the deterioration of rocks over a period of time when subjected to water immersion. Samples are alternately tumbled in mesh drums through a water medium and oven-dried for two cycles. Slake durability is a simulated weathering test to determine abrasion resistance during wetting and drying cycles of shale and similar soft rocks, as used in embankments and other construction-related applications, and the percent loss of mass is referred to as the slake durability index. The slake durability apparatus consists of a motorised drive unit, mounted on a baseplate, which can rotate two or four drums at a speed of 20 r.p.m., with the tank assemblies filled with water to a level 20mm below the drum axis. The test drums are manufactured from 2.00 mm mesh, 140 mm dia. x 100 mm long.
Standards: ASTM D 4644
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Last Updated: September 2026
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