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0oa 0oa 0oa areas argillites ASTM container method Biwabik bloated aggregate bloated product bloating materials bloating tests bloating-temperature range Bureau of Mines calcium oxide CD 0H cd CD CD CD H cd r4 cd rH CD TJ clays and shales CM CM CM CM CN compressive strength Cretaceous shale Dakota County Dark0gray shale Decorah shale Depth electric muffle furnace feed feet below glacial further tested Glacial clay glacial drift Goodhue County gray shale Greenish0gray shale Grosh i-l CD inches iron0stained lb/cu ft Light0gray lightweight aggregate Mesabi Range Minnesota clays oa oa oa particles percent Precambrian Virginia slate preliminary tests presented in table qoux-g/E qoux-z/X snxd qsan-g saxw rH rH Roadcut rotary kiln rotary-kiln tests Sample represents sample section Sauk River sieve analysis sintered snxd qoux-z/X saxw Stearns Stearns County suitable Swift Counties test cylinders TJ cd TJ rH TJ TJ weight