Abstract
A sulphate-resisting portland cement (SRPC) modified with 20 vol% condensed silica fume was treated hydrothermally for 6 months at 200°C and 8.5 MPa in the presence of calcium bentonite, Inconel 625, and saline groundwater, and in contact with either used fuel of fuel recycle waste glass. In contact with the waste forms, the primary cement phase alite showed conversion into tobermorite/xonotlite. In contact with the compressed clay, hydroxyapatite and hydroxyellestadite were formed in addition to tobermorite.
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