The normalstrength
values were chosen based on typical values for
most prestressed concrete members, and the high-strength
values were chosen as representative of typical-span bridge
girders. All mixtures used high paste contents and highrange
water-reducing admixtures to achieve SCC behavior.
Two mixtures contained Class C fly ash, while the remainder
contained only portland cement. Four specimens were
cast using each concrete mixture with the exception of the
normal-strength shale (NSS) mixture. An extra specimen
was cast to test a trial version of this mixture in order to
utilize available space in the prestressing bed on another
project. Table 4 presents the mixture proportions for each
concrete type, including the different mixture used for
specimen NSS-1.