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A three-phase program was undertaken to determine the effectiveness of reduced aggregate particle sizes in minimizing D-cracking in field exposures, to determine the importance of source of fine aggregate and quantity of maximum permissible aggregate particle size on freeze-thaw durability, and to evaluate the relative importance of certain field environmental conditions on D-cracking. These objectives were approached through laboratory freeze-thaw testing of concretes, resurveys of existing pavements in Ohio, and the construction and monitoring of a test road near Vermilion. Field surveys thus far indicate that reducing maximum aggregate particle sizes is beneficial, while the laboratory tests indicate that the proportion of coarser particle sizes has a significant effect on durability. The laboratory tests also showed that source of fine aggregate has essentially no bearing on durability, even when derived from coarse aggregate material of known low durability.