Rock Classification Hammer (Low Impact Energy Model)

Standards Compliance :

• Complied as per ASTM D5873

Construction :

• This lightweight and portable impact hammer is used for rock classification tests.

• Includes rubbing stone for surface preparation.

• The hammer is similar to a device used for many years for strength classification tests of mass concrete.

Cylindrical Cores :

• Usually NX size, are held in a horizontal position and the hammer mechanism is impacted against the core to obtain rebound readings. A series of readings are taken along the length of the core to get the average rebound number.
• The core rock specimen normally NX °54.7 mm is held on a special cradle in horizontal position and the hammer tests the same in all its length to obtain average of the readings.
• The Rock Cradle is used to hold cores (EX °21.46 mm and NX °54.7 mm) in place during rock classification test procedures. The cradle incorporates a guide for positioning the hammer to allow for a series of readings along the length of the core.
• Rock cradle and Calibration Anvil should be ordered separately.