روشي جديد براي تخمين خزش پايه بتن با استقاده از آزمايش هاي كوتاه مدت خزش تحت دماي بالاتر

A New Method for Estimation of Creep of Concrete Using Short-Term Tests under Higher Temperature

In the Present study, attempt will be made to propose a new method for prediction of long-term essential creep of concrete utilizing some short-term creep tests under high temperature. To do so, regarding the similarities between essential creep of concrete and creep in viscoelastic materials, the time-temperature equivalence relation in viscoelastic materials is evaluated for concrete. This relation states that experimental curves of creep at different temperatures fit Into a single curve when shifted along the axis of logaritmic time. To develop the model, an equation was first developed taking into account the effect of temperature and the maturity of concrete. Then, an appropriate method was proposed for transmission of the creep curve of concrete under a specific temperature to fit in the creep curve oldie same concrete under a temperature. The proposed model was verified using existing experimental data which very good agreement was observed.