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Rock Classification Hammer



Rock Mechanics

Sub Category:

Surface Hardness

Product Group:

Rock Classification Hammer

This lightweight and portable impact hammer is used for rock classification tests. The hammer is similar to a device used for many years for strength classification tests of mass concrete. Cylindrical cores, usually NW size, are held in a horizontal position and the hammer mechanism impacted against the core to obtain rebound readings. A series of readings is taken along the length of the core to get the average rebound number.

Standards: ASTM D5873, EN 12504-2, ASTM C805

Weight, lbs 3
Description Rock Classification Hammer



Plunger Applies pressure for hammer rebound
Body Aluminum; with indicator scale
Rubbing Stone Prepares test surface
Accuracy Within 15 %
Weight Net 3 lbs. (1.4 kg)


NW Rock Cradle


ing 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 Standards: ASTM D5873

Digital Point-Load Test Apparatus


Originally developed at Imperial College, London, the apparatus comprises a two-column fixed crosshead frame and a hand operated hydraulic jack. Pressure applied by the jack extends the piston carrying the lower conical point. The upper point is fixed to the crosshead with a scale mounted on the frame to provide specimen diameter information for use in point-load strength index calculations. Pressure is indicated directly on the digital readout unit. Loads up to 55 kN can be applied to specimens as large as 101.6 mm in diameter. The apparatus is supplied complete with heavy-duty face mask. Standard: ASTM D5731