To determine the slake durability index (Weathering) of rocks.
EQUIPMENTS REQUIREDBox, Motor drive, Oven, Gloves, Rock samples.
THEORY:
Slake Durability Test: Slake Durability is a simulated weathering test to determine abrasion resistance during wetting and drying cycles of different rocks which used in Embankments and other construction related applications.
Weathering: Weathering is the breaking down or dissolving of rocks and minerals on earth’s surface.
Water, ice, acids, salts, plants, animals and changes in temperature etc are the agents of weathering.
Durability: Durability is defined as the ability of a material to remain serviceable in the surroundings environment during the useful life without damage or unexpected maintenance.
OR
Durability is defined as resistance to weathering agents.
PROCEDURE:
- Selecting the 10 Sample and weighing (40-50 gm), total weight must be 400-500 gm.
- Weight of clean, dry and empty drum.
- Selected specimen are placed in Drum and dried at constant temperature of 105 Celsius.
- After drying the Drum, assembly is weighted again and recorded as ‘A’.
- Water is placed in Drum almost half of the Drum, and at 20 revolution per minute Drum is revolved.
- After 10 min Revolution, Drum assembly is taken out, oven dried at 105 Celsius for 24 hours.
- Oven dried weight of Drum is taken again recorded as B.
SLAKE DURABILITY TEST MACHINE & sample examples
TEST SAMPLES ARE USED IN THE TEST WERE TAKEN FROM FIELD FROM BACK OF CIVIL ENGINEERING DEPARMENT.
Slake Durability Index : B/A * 100
B= Oven dried weight after the revolutions.
A= Oven dried weight before revolutions.
RESULTS:
COMMENTS: