Description
The point load tester accurately determines the uncorrected point load strength index Is which is then converted to a point load index having a standard equivalent diameter (De) of 50 mm. The corrected Is(50) index enables rock strength classification; it can also be used to estimate the uniaxial compressive strength (UCS) and the rock’s anisotropy Ia(50). The device consists of a hydraulic ram, a manual hydraulic pump with a pressure gauge and a rigid two-column crosshead frame. Pressure applied by the pump displaces a piston carrying the lower conical platen. Pressure is directly read from the digital pressure gauge. The upper platen is fastened to the crosshead and a fixed graduated scale measures the sample diameter. The apparatus is supplied with front and rear protective shields. A carrying case is also provided to allow safe and efficient transportation. This instrument follows ASTM D5731 procedures.
Specifications
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Standard
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ASTM D5731
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Load capacity
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100 kN
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Maximum sample size
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4 inches (101.6 mm)
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Pump pressure
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70 Mpa
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Pressure accuracy
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0.2% FS
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Weight
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25 Kg
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Dimensions
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50 x 30 x 25 cm
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Benefits
Simple test
Direct reading of specimen diameter
Extreme rigidity
Inexpensive instrument
Portable, easy to carry on-site
Attractive alternative to the UCS test because provides similar data at a lower cost
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