A Fundamental Study on Modeling Prediction of Deterioration of Concrete Exposed to Very Low Temperature
By Takuya Obara, Kenji Ogawa, Ichiro Iwaki and Takashi Mimura
Concrete Research and Technology
Vol.14, No.2, Mar 2003 (Issue 32)
- Synopsis:
- It is known that concrete exposed to repeated cycles of cooling from ordinary temperature to very low temperature below ? 20°C induces severer deterioration than that cooled to ? 20°C, which is the standard temperature for any general study of frost damage. By considering the behavior of water in the pores of cement paste matrix, the model to predict and quantify such deterioration is necessary. In this study, a simple dilation model was formulated based on the behavior of pore water during the cooling process. A new index of deterioration, other than relative dynamic modulus of elasticity, was also proposed. It was found that the index calculated from this model corresponds well to that obtained from experimental data of various mixture proportions and cooling conditions.
- Keywords:
- Very low temperature, Modeling, Hydrostatic pressure, Chemical potential, Pore size distribution, Index of deterioration
