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The subject of variability of concrete-making materials was not covered in previous editions of ASTM STP 169. It has been derived from the work of the joint ASTM C01/C09 Task Group on Variability of Concrete-Making Materials. The Task Group is providing the impetus for development of guidelines on determining uniformity of concrete-making materials.
Vice president, Research and Technical Services, Portland Cement Association, Skokie, IL