An 11 inch thick Portland Cement Concrete (PCC) test strip was constructed on an existing econocrete subbase, at the NAPTF, to investigate the effects of slab size, mix design, and curing procedures on shrinkage and curling of the PCC slabs. Two slab sizes: (4.5 by 4.5 meter (15 by 15 feet) and 6 by 6 meters (20 by 20 feet) were used on the test strip. The econocrete subbase had previously been constructed on a granular lower subbase over a low strength subgrade (4-5 CBR). A three-part optimized concrete mix was placed on half of the test strip, and the original two-part mix design was used on the other half. Both mixes complied with the FAA P-501 specification. Special attention was given to the curing stage. In addition to watering, the effect of thermal blankets was investigated. After the curling studies were completed the slabs were trafficked to failure.