By Austin Osman Spare
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2 to 4 kg. loads. The Knoop hardness number is very similar to the VDH. d) The Rockwell hardness (R-B and the R-C test) are based on depth of penetration with withapre-load a pre-load of 10kg. which is first applied to the surface and is retained for the main test when the depth of indentation for a further 150 kg. is recorded on a dial gage. A spherical indenter is used for softer minerals (R-B test), a conical 34 2. Properties of Stone 20 Percussion drilling. progress in em/min Fig. 30. Relationship of percussion drilling, as progress in em/min, to Shore hardness (Brinell MUELLER (1963) from KAHLER, modified by Hardness).
Rock Creep is the time-dependent deformation of a rock substance subjected to constant stress conditions. Creep is accelerated by well developed perfect cleavage of calcite in 3 directions. Marble is therefore very susceptible to creep and deformation possible on freely suspended marble slabs by their own weight. Buckling Table 9. /cm. fcm. 9 X 1010-55 Semi-elastic Non-elastic Adapted from: FARMER (1968). by creep on marble slabs of New Orleans grave yards and other old cemeteries of the Old and New World are a common sight (see Fig.
Impact toughness versus the compressive strenght. The separation of the different rock groups is similar to the relationship of the scleroscope hardness versus the compressive strength. Data compiled from data of OBERT et al. (1946), and WINDES (1949), and WINDES (1950) sive strength. At a given compressive strength granite has a higher impact toughness than sandstone or limestone. Differences in intergranular bonding appear to have an influence similar to that on the Schmidt and the Shore hardness.