Slake Durability Apparatus
ASTM D 4644
Plake durability apparatus, 220-240 v 50 hz
This test method has been developed to assess the deterioration of rocks over a
period of time when subjected to water immersion. 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. Samples are alternately tumbled in mesh drums
through a water medium and oven-dried for two cycles. The percent loss of mass is
referred to as the slake durability index.
The slake durability apparatus consists of a motorized drive unit which is mounted on a
baseplate and which can rotate two or four drums at a speed of 20 r.p.m. The tank
assemblies are 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.