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Sixty concrete mixes using different combinations of aggregate, combining good quality sand and gravels with poor quality sand and gravels, different sand contents and water-cement ratios, the latter ranging from 0.32 to 0.70, were used to determine their effect on the resistance of concrete to abrasion. Aggregates were selected which represented Los Angeles abrasion losses at 500 revolutions ranging between 12.6 and 39.1 per cent. Measure of resistance to abrasion loss was determined by three types of abrasion machines: the Davis steel ball and the dressing wheel abrasion apparatus, which represent the types of wear caused by steel wheels under heavy load, and the Ruemelin shotblast apparatus, which simulates the erosion caused by solids in flowing water.
Materials Engineer, Bureau of Reclamation, U. S. Department of the Interior, Denver, Colo.