Abstract
Most of the studies on creep of concrete have dealt with the deformation under lower sustained stress, but not with the rupture or the deformation under higher sustained stress. In this study, the creep rupture tests were performed on the normal and lightweight concretes.
The results obtained can be summarized as follows:
The phenomenon of creep rupture can be divided into three parts, transient creep, steady state creep and accelerating creep, and the relationship between the rate of steady state creep and the time to failure can be shown by an exponential function.
On the assumption that the time to failure takes place in a stochastic process, its fluctuation was discussed. The statistical analysis of the test results shows that the probability of survival at the same stress level is represented by a logarithmic normal distribution.
The creep limits of the normal and lightweight concretes are determinend, respectively, as 84.5% and 83.8% of the static strength, by the Probit analysis method.
