TECHNICAL NOTE. CONSISTENCY AND REPEATABILITY OF SCHMIDT HAMMER REBOUND DATA DURING FIELD TESTING

The Schmidt hammer has been used to compare the surface rebound hardness of rocks, from which the uniaxial compressive strength can be estimated. Field tests (1) to examine the consistency and repeatability of the Schmidt hammer when used on a rock exposure and (2) to ascertain the best procedure for recording rebound values are described. The tests were carried out on limestone, sandstone, hornfels and granophyre. It was concluded that: (a) collective data distributions of Schmidt hammer rebound value, with artificially low values eliminated by a realistic cut off point, and of peak values along a scanline in similar rock are approximately normal; (b) Schmidt hammer rebound values are consistent, variability across the face exceeds that at any individual point; (c) rebound values have a tendency to rise and to show considerable variation during the first 3-4 continuous impacts at a print; (D) to obtain a repeatable rebound value, the peak value from at least five continuous impacts at a point should be selected. (TRRL)

  • Availability:
  • Corporate Authors:

    Pergamon Press, Incorporated

    Headington Hill Hall
    Oxford OX30BW,    
  • Authors:
    • Poole, R W
    • FARMER, I W
  • Publication Date: 1980-6

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Filing Info

  • Accession Number: 00324850
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Jun 12 1981 12:00AM