Abstract
The research objective of this study is to examine the strain recovery of concrete after compressive creep. First, the influences of concrete strength, load duration, and stress-strength ratio at loading time on the initial-recovery are investigated on 128 concrete prisms. The concrete strength, loading age, and load duration have no clear influence on the initial-recovery strain coefficient (the ratio of initial-recovery strain to initial strain) when the concrete age concrete is over 28 d and load duration is over 41 d, but the initial-recovery strain coefficient decreases as the stress-strength ratio at loading time increases. Moreover, the effects of loading age, load duration, and concrete strength on creep-recovery are investigated by examining data from tests and references. The basic creep-recovery model is obtained by fitting the creep-recovery experimental data from 28 concrete prisms. Then, a multi-coefficient creep-recovery model for concrete that considers the influence of creep, loading age, load duration, and concrete strength is proposed. Finally, the proposed creep-recovery model is verified with reference data, with better performance than the existing creep-recovery models.
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