The point load strength test is intended as an index test for the strength classification of rock materials. It may also be used to predict other strength parameters with which it is correlated, for example uniaxial tensile and compressive strength. The test measures the point load strength index of rock specimens, and their strength anisotropy index which is the ratio of point load strengths in directions which give the greatest and least values. Rock specimens in the form of either core (the diametral and axial tests), cut blocks (the block test), or irregular lumps (the irregular lump test) are broken by application of concentrated load through a pair of spherically truncated, conical platens. Little or no specimen preparation is needed. The test can be performed with portable equipment or using a laboratory testing machine, and so may be conducted either in the field or the laboratory. The testing machine consists of a loading system (for the portable version typically comprising a loading frame, pump, ram and platens), a system for measuring the load required to break the specimen, and a system for measuring the distance between the two platen contact points. (TRRL)

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  • Corporate Authors:

    Pergamon Press, Incorporated

    Headington Hill Hall
    Oxford OX30BW,    
  • Publication Date: 1985-4

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Filing Info

  • Accession Number: 00396929
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Aug 25 2004 2:39AM