Browsing by Author "Kiyama, S"

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    Feasibility of incorporating cations and anions expected in radioactive waste streams in metakaolin-based geopolymers.
    (Electrical Components International, 2007-03-25) Perera, DS; Vance, ER; Aly, Z; Fuchs, A; Kiyama, S; Davis, J; Smith, SV
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    Geopolymers as candidates for low/intermediate level highly alkaline waste.
    (Materials Research Society, 2006-11-27) Perera, DS; Vance, ER; Kiyama, S; Aly, Z; Yee, P
    Geopolymers should be serious waste form candidates for intermediate level waste (ILW), insofar as they are more durable than Portland cement and can pass the PCT-B test for high-level waste. Thus an alkaline ILW could be considered to be satisfactorily immobilised in a geopolymer formulation. However a simulated Hanford tank waste was found to fail the PCT-B criterion even for a waste loading as low as 5 wt%, very probably due to the formation of a soluble sodium phosphate compound(s). This suggests that it could be worth developing a ìmixedî GP waste form in which the amorphous material can immobilise cations and a zeolitic component to immobilise anions. The PCTñB test is demonstrably subject to significant saturation effects, especially for relatively soluble waste forms.