High-Strength Self-Consolidating Concrete Girders Subjected to Elevated Compressive Fiber Stresses

摘要

There are limited measurements documented in the literature related to long-term prestress losses in self consolidated concrete (SCC) members. Recorded test data has shown variations in mechanical property behavior of SCC compared to conventional HSC mixtures in the 8-12 ksi range. Over the past year, precast manufactures such as Coreslab Structures, Inc., in Marshall, MO. have experienced inconsistencies in camber behavior with SCC which may be attributed to mechanical property variations, but variation in stress may also be a contributing factor. Additionally, increasing the allowable fiber stress limit is desired for full utilization of materials and members, as long as structural performance is maintained. Futhermore, accurate prediction of time-dependant prestress losses is essential for determination of the effective prestress force, which effects serviceability prediction and structural performance. Further investigation is required.