The normal strength 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.