IS 8764
Point Load Index tester, a rock testing instrument for determining the Diametrical Point Load Strength Index of rock cores and Irregular Lumps which may be tested without any treatment. The Point Load Test is primarily as index Test for strength classified of rock materials. This instrument is mainly intended for field
measurements on rocks specimen, but it can be used in the laboratory.
ASTM D5731
Digital Point Load Test Apparatus consists of a 60 kN capacity load frame with a
hydraulic loading ram driven by a hand pump. The frame is adjustable for
testing of samples up to 102mm diameter. A ruler assembled on the frame allows the
direct measurement of the distance between the conical platens before and
after the test. The compression load is measured by a pressure transducer
connected to an advanced digital display unit assuring the best accuracy and
resistance to the failure shocks.
Safety Features
IS 10082-1982 Specification
The instrument is useful for testing specimen from 50mm dia to 100mm and of thickness
of half the diameter. This is to test for indirect measurement of tensile strength of
rocks. The specimen is held in circular jaws, this is primarily similar to a
compression machine and consists of a small load frame having sturdy base
with two vertical threaded rods and an adjustable cross head. The hydraulic
jack is fitted at the centre of the base of the load frame. The jack of the load frame is self
retracting and two plain platens are supplied. A pressure gauge capacity 0-100 kn
x 1 kn is fixed at the base of jack. A maximum pointers is also provided on the
gauge, a pair of semi circular platens for 50mm dia samples also provided. The
instrument can be used in field also.
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.