Rock Classification

ASTM D5731 | ISRM | ASTM D5873 | AS 4133.4.1
The rock strength index apparatus consists of a high stability load frame 100 kN cap. with hydraulic loading ram actuated by a hand pump. Loading frame and manual pump are independent resulting in a superior functionality and usability of the equipment.

45-D0550: Digital rock strength index apparatus, 100 kN cap. conforming to ASTM D5731 and ISRM suggested method, complete with:
- Testing frame with high performances hydraulic jack and manual pump
- Load measurement by pressure transducer (traceable calibration certificate included)
- In built meter measuring the vertical clearance between the conical platens
- Supplied with rigid ergonomic carrying case with wheels
Battery charger 110-230 V, 50-60 Hz, 1 ph. Power cable included

Main features:
  • Superior functionality and usability of the equipment, since the pump is separate from the frame
  • Ergonomic digital read out unit with wide graphical display and 6 keys membrane keyboard
  • Effective resolution: 18 bit (1/262'000 div.)
  • Load measurement accuracy: ± 1 % 
  • Load resolution: 1 N
  • Supplied complete with traceable calibration certificate for load measurement accuracy 
  • Set of lower and upper platen with spherical seat for compression tests on small cylinders available as accessory 

The unit is conforming to ASTM D5731 and ISRM suggested method and the wide testing area allows to test both rock cylinders and irregular shaped samples.

45-D0550/D5: Set of lower and upper platen 52 mm dia. with spherical seat

45-D0550/D6: Mounting tool suitable for the conical points fitted on point load machine

58-C0215/T2: Serial cable for PC connection. Requires a PC with RS232 serial port or RS232/USB adaptor (see our model 82-Q0800/3)
Rock classification hammer is used to measure the rebound index on rock cores and samples.

32-D0561/C: Rock test classification hammer with low impact energy 0.735 Nm.
Supplied with hard plastic carrying case. Conforming to ASTM D5873 and ISRM.

The device is simple, easy to use, and is similar to the one used for testing concrete.
The level of impact energy only is different: 0.735 Nm.
Rock cores are positioned horizontally and the rebound index is obtained from the average of several measurements performed perpendicularly to the longitudinal axis, using the ASTM rock cradle as shown in the picture.

32-D0562/A: ASTM rock cradle, Universal model, can hold rock core samples from
EX (21.46 mm) to NX size (54.74 mm dia.). The cradle comprises a vertical hammer guide fit to a steel plate of minimum mass conforming to ASTM D5873, and a magnetic “V” block that can be easily fit to the steel plate.
Rock picks and hardness scale are used for preliminary rock identification.

  • 32-D1710 Fully polished, leather grip. Weight approx.: 650 g
  • 32-D1711 Fully polished, nylon vinyl grip. Weight approx.: 550 g

32-D1710: Rock pick pointed tip

32-D1711: Rock pick chisel edge

32-D0529: Mohs hardness scale set
Set of 9 mineral specimens.