| Self Consolidating Concrete (SCC) is a recent advancement in the concrete industry. SCC is a type of concrete that can be placed without consolidation and is widely accepted and used in the precast industry. The use of lightweight SCC is becoming more common due to increasing transportation costs. This research program examined the performance of two full-sized, precast/prestressed double tee beams cast with lightweight SCC. Each double-tee was instrumented with 4 vibrating wire strain gauges at midspan. The strains were monitored continuously while the double tees were in the precast plant's yard and again at erection at the structure Additionally the initial camber and camber growth of the double tees were measured. The lightweight SCC used in the double tees had a slump flow of approximately 31 inches and a VSI of 1.5. The concrete strength was 3970 psi at release and 6980 psi at 28 days, and the 28 day modulus of elasticity was 3400 ksi. Finally, transfer and development length of laboratory beams cast with the same lightweight SCC mixture were also measured. The measured prestress losses, transfer and development lengths, and camber were compared to values obtained using standard prediction equations. |
