Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7884638 | Cement and Concrete Research | 2018 | 11 Pages |
Abstract
Cementation of the secondary aqueous wastes from TEPCO Fukushima Daiichi Nuclear Power Plant is challenging due to the significant strontium content and radioactivity, leading to a potential risk of hydrogen gas generation via radiolysis of water content. The present study investigates the reduction of water content in calcium aluminate cement (CAC) with/out phosphate modification by a heat-treatment during the solidification. The reduction of water in the CAC was found restricted by the rapid formation of crystalline hydration phases, whereas the phosphate-modified system allowed the gradual reduction of water, achieving the reduction of 60% water content at 95â¯Â°C. Curing at 60-95â¯Â°C also eliminated the significant cracks found at 35â¯Â°C in the phosphate system. The possible difference in the amorphous products, NaCaPO4ânH2O type at 35â¯Â°C and Ca(HPO4)âxH2O type at 60-95â¯Â°C, may have contributed to the improvement in the microstructure together with the change in the pore size distribution.
Keywords
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Physical Sciences and Engineering
Engineering
Industrial and Manufacturing Engineering
Authors
Inés Garcia-Lodeiro, Keita Irisawa, Feiyang Jin, Yoshihiro Meguro, Hajime Kinoshita,