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Point Load Index Testing

The Point Load strength test is based on the indirect tensile strength test of rock by fracturing a specimen of rock using a machine equipped with conical platens and a load measuring system. The test provides a Point Load Strength (Is) for different size samples which is then corrected to a standard 50 mm size equivalent, the Point Load Strength Index (Is(50)), for comparison with other test results. The test applies to rock core samples, blocks and irregular specimens with a minimum dimension in the range of 25mm to 100mm.

Point Load Index tests can be used with AS 1726 Geotechnical Site Investigations to classify rock from ranges of Very Low (VL) Strength to Extremely High (EH) Strength.

39---Point-Load-Index
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