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<br /> <br />8.12 <br />(Flow Chart may be modified by in-service perr~rmance data) <br />Check the appropriate boxes along flow chart lines to define <br />the durability of rock in question. <br />SANDSTONE <br />Ledge or Gentle <br />ridge former Slope <br />Reject <br />Closely spaced <br />discontinuities <br />Field <br />Test <br />Reject <br />Does not "Rings" when hit <br />"ring" when hit with hammer <br />with hammer <br />Knife scratch Knife scratch <br />medium hard with difficulty <br />Hreaks Breaks Breaks with <br />easily with difficulty <br />or difficulty <br />strong <br />earthy <br />odor Little No earthy <br />or to odor <br />absorbs moderate <br />eater earthy <br />easily odor <br /> Accept <br /> Lab <br />Reject test <br />Figure 8.2a. Rock durability field flow chart. <br />6 <br />f <br />i <br /> <br />j <br />