TECHNICAL NOTE. THE SHORE HARDNESS OF ROCK

The shore hardness (sh) of a specimen is determined from the rebound height of a diamond or tungsten-carbide tipped hammer released from rest on to a horizontal smooth surface. The arithmetic mean of at least 20 readings taken at random on a ground surface of the rock sample is usually taken. The technical note describes work on the effect of specimen size and the effect of moisture on sh. It has been established that sh is dependent on the volume of the specimen tested and not simply on length or area. A minimum specimen volume of 40 cu cm is suggested. The mean of at least 50 readings made on 5 specimens can then be taken as the shore hardness of a rock. Wet specimens usually give lower values of sh. Errors may arise if edge readings are included in the arithmetic mean of the shore hardness. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00207624
• Corporate Authors:

  Pergamon Press, Incorporated

  Headington Hill Hall
  Oxford OX30BW,    
• Authors:
  • Rabia, H
  • Brook, N
• Publication Date: 1979-10

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 335-336
• Serial:
  • International Journal of Rock Mechanics and Mining Science
  • Volume: 16
  • Issue Number: 5
  • Publisher: Pergamon Press, Incorporated
  • ISSN: 0020-7624

Subject/Index Terms

• TRT Terms: Crushers; Hardness; Moisture content; Physical properties; Rocks; Samples; Sampling; Test procedures; Volume
• Old TRIS Terms: Gyratory crushers; Rock properties; Shore hardness
• ITRD Terms: 5914: Hardness; 5920: Moisture content; 4154: Rock; 6251: Sample (mater); 6288: Test method; 6468: Volume
• Subject Areas: Geotechnology; Highways; I43: Rock Mechanics;

Filing Info

• Accession Number: 00309626
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Jul 22 1980 12:00AM