A. Aili, I. Maruyama, Y. Umeki, K. Yokokura,?Impact of Aggregate?Cement Paste Reaction Forming Al-tobermorite on Ion Transport in Aged Concrete, Transp. Porous Media. (2023).
We have previously reported that feldspar and quartz react with cement hydrates to form Al-tobermorite in modern concrete in the Hamaoka Nuclear Power Plant Units 1 and 2.
In fact, such reactions are also a topic of discussion in nuclear waste disposal, where very long-term (even after 10,000 years?) consideration is needed.
Therefore, we have examined how cesium (cations) and chloride (anions) would behave if Al-tobermorite were formed at about 50 degrees Celsius.
As expected, the tortuosity of pores is dramatically affected by such temperature + Ca/Si reduction of C-A-S-H + formation of Al-tobermorite, and migration is more likely to proceed. On the other hand, Al-tobermorite also shows the adsorption of Cs in the interlayer space during the ion exchange process.
if you want to do this experiment in the lab, it takes more than 15 years.
This research is sideway research of the Hamaoka project, but the results were useful for other fields.