Study on Long-term Deformation Performance of High Performance Concrete Used in Bridge

摘要

The long-term deformation performance of high performance concrete with different W/C ratios (Water/ Cement ratio) and contents of fly ash used in bridge was studied. Meanwhile, the creep of high performance concrete studied was fitted by the improved three point method, that is, expressions of creep functions established by curves of time functions and existing creep predictions with optimized parameters based on experiments. Results show that: (1) Creep of ordinary concrete in this work differs from that of the high performance concrete with low W/C ratios and high fly ash contents, indicating the existing creep model could not be used to predict creep of this high performance concrete (2) The expressions derived from the improved three point method in this paper were more suitable for creep prediction of high performance concrete with low W/C ratios and high fly ash contents.