Testing and prediction of creep behavior of high performance self-compacting concrete - From material to structure

A high performance self-compacting concrete (HPC, C50) which exhibits much lower creep property than conventional high strength concrete (HSC, C50) is designed by substituting 40% cement with ultra-fine fly ash composite (UFAC), the long-term creep behavior of tested specimens under standard environment and simply supported T-section beams with six meter long under natural environment, constructed with HPC50, is tested. The predicted creep values based on formulae included in ACI-95 and CEB-FIP(MC90) fit well with the experimental results based on material trials, while serious discrepancy is found between the deduced values from structure experiment. The presented approach to predict time-dependent creep behavior of structures with modified creep models in ACI-95 and CEB-FIP(MC90) based on structural short-term testing results shows agreeable with experimental values. The proposed model can be used to calculate creep effect both in reinforced and prestressed concrete structures constructed by any kind of concrete.