Lab Services: Rock testing
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Test Method Title
Standard Test Method for Determination of the Point Load Strength Index of Rock and Application to Rock Strength Classifications
Point Load Strength Index, Estimated Uniaxial Compressive Strength, Strength Anisotropy Index
Description of Test
Rock specimens are subjected to an increasingly concentrated load until failure occurs by splitting the specimen. The concentrated load is applied through coaxial, truncated conical platens. The load at failure is used to calculate the point load strength index. This index can be used to estimate the unconfined compressive strength.
Preferred Test Sample Size
Rock core specimens
Number of Test Specimens
at least 10 and up to 20 specimens (for irregular shapes)
Test Specimen Size
The specimen's external dimensions shall not be less then 30 mm and not more than 85 mm with the preferred dimension about 50 mm.
Compressive strength, index test, point load, rock, axial, diametral