2011 Volume 65 Issue 1 Pages 161-167
It is very important to predict the deterioration of concrete that is used for a storage container of the radioactive waste. So it is necessary to comprehend the deterioration of cement based materials associated with calcium leaching by contact with the ground water for the super long term. However, there are not many knowledge about the diffusion performance of deterioration of calcium silicate hydrate associated with calcium leaching. Therefore, this study focused on the degradation of calcium silicate hydrate with calcium leaching, in order to gain the knowledge of the transport properties of calcium silicate hydrate. As a result, there was the correlative relationship between porosity in calcium silicate hydrate and the diffusion coefficient of chloride ion of calcium silicate hydrate associated with calcium leaching. Also, we attempted to estimate the diffusion coefficient of chloride ion in the calcium leached hardened cement paste from plain hardened cement pastes, with the deterioration of calcium silicate hydrate and calcium hydroxide. And there was no difference between estimated value of the diffusion coefficient and measured one. Therefore, it was shown that it was important to consider the leaching of calcium hydroxide and the degradation of calcium silicate hydrate in order to predict of the transport properties of cement based materials.
