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05/02/2001 09: 44 3034693581 PAGE 03 <br /> PROPOSED MIX DESIGN, NEWCASTLE COAL-FIRE CRATER <br /> BACKFILLING <br /> CELLULAR THERMAL CONCRETE <br /> WET DRY COMPRESSIVE CEMENT FOAM FLYASH <br /> DENSITY DENSITY STRENGTH Ibs/yd3 ft3/yd3 Ibs/yd3 <br /> Ib/ft3 Ib/f t3 si <br /> 30 25 125 300 20.3 212 <br /> This grout is a fluid, cellular concrete (foamed grout) having thermal <br /> refractory properties advantageous for sealing hot venting cracks in the <br /> subsidence crater. The mix will be modified to increase the slump for final <br /> grouted cap construction by adding a greater solids content, but no other <br /> additives will be used. <br />