Table 2 also provides the measured values of compressive strength and degree of hydration at ages of 7 d, 28 d, and 91 d for the three mortars. Degrees of hydration in the mixtures with the prewetted LWA (#2 and #3) were greater than that in mixture 1 at all ages, due to the extra water provided by the internal curing, in agreement with previous observations [12]. The compressive strengths of the three mixtures are nominally identical within the measured variation of the testing. The expected compressive strength reduction due to the increased air contents of mortar mixtures 2 and 3 are basically offset by the beneficial effects of their increased degrees of hydration. These results indicate that the FLAIR delivery of the SRA is equivalent to delivery by conventional means in terms of achieved hydration and strength.