TESTING AND PREDICTION OF CREEP BEHAVIOR OF HIGH PERFORMANCE SELF-COMPACTING CONCRETE-FROM MATERIAL TO STRUCTURE

摘要

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.