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Ra&57i+e Vlh and Physics(RWdies—HC001-15,HC002-15 HO003-14 <br /> HC004-15%HC005-15,HCOOrr15,aW HC007-15 <br /> Page 3 <br /> 3.2.1 Uniaxial Compressive Strength Test <br /> The uniaxial compressive specimens were loaded at a constant rate, chosen so <br /> that failure would occur within the two (2) minute to fifteen (15)minute period set forth in <br /> the ASTM (ASTM D 7012-04, Method C)specifications. The loading rate for all uniaxial <br /> compressive strength specimens was programmed into the computer as a ramp <br /> function defined as 9,000 lb/min. <br /> After placing the specimen between a set of hardened steel platens, the machine <br /> was then accelerated to the pre-selected loading rate. The data acquisition unit contin- <br /> uously monitored the load, cumulative test time, and position of the lower platen. The <br /> uniaxial compressive strength is calculated as the load at failure divided by the <br /> specimen area as indicated by equation 1 below. <br /> ac = P Eq. 1 <br /> [(7t'D2)/4] <br /> Where: <br /> ac =compressive strength (Ib/in2), <br /> P = peak or failure load (lb), <br /> D = specimen diameter(inches), and <br /> n = constant, 3.1416. <br /> 3.22 Bulk Density and SOMMc Gravity <br /> The bulk density of the uniaxial compressive strength specimens was determined <br /> by weighing the specimens to the nearest 0.1 gm, converting grams to pounds, and <br /> dividing the weight in pounds by the sample volume determined from measurements of <br /> diameter and height. The dimensions of the specimen were used since the rock is <br /> machined to a perfect right cylinder for the uniaxial compressive strength tests. The <br /> conversion between bulk density and specific gravity involves dividing the bulk density <br /> by 62.4 Ib/ft,the unit weight of water. <br /> IV. Test Results for All Boreholes <br /> The results for the uniaxial compressive strength tests can be found in Exhibit A. <br /> The specimen location photographs can be found in Exhibit B and the photographs of <br /> the core can be found in Exhibit C. <br />