[3F06-09] Secondary aqueous waste treatment 1

[3F09] Development of solidification techniques with minimised water content for secondary radioactive aqueous wastes in Fukushima

(4)Heat-treatment of phosphate modified calcium aluminate cement under open system

*Maria Ines Garcia Lodeiro¹, Feiyang Jin¹, Keita Irisawa^2,1, Yoshihiro Meguro², Hajime Kinoshita¹ (1.University of Sheffield, 2.Japan Atomic Energy Agency)

Keywords:Calcium Aluminate Cement (CAC), Phosphates, C-A-P-H gel, hydroxyapatite

The present study investigates the effect of water loss during the curing of phosphate-modified CAC system at different temperatures (35ºC, 60ºC, 90ºC, 180ºC) in open systems. Experimental results indicate that these phosphate-based cements do not form the conventional CAC crystalline hydration products at these temperatures but provide structural integrity despite a significant amount of water loss. Hydroxyapatite was detected at temperatures ≥60ºC.