Chemistry and Performance of Blended Cements and Backfills for
use in Radioactive Waste Disposal
Keyword(s):
Fly Ash
◽
ABSTRACTThe ability of NaCl and MgSO4 to impair the performance of Portland cement, blended cements containing slag and fly ash and of a permeable backfill have been measured. Performance is determined by decrease in pH, changes in mineralogy and loss of physical coherence. Experiments have been made at 25°, 55° and 85°C and extensively backed up by chemical models of cement performance. NaCl, up to 1.5M, has a comparatively slight impact on performance but MgSO4 rapidly and almost quantitatively reacts, lowering system pH's to < 10, conditioned by mixtures of Mg(OH)2 and magnesium silicates with gypsum.
1960 ◽
Keyword(s):
2009 ◽
Vol 17
(5)
◽
pp. 1031-1033
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2003 ◽
Vol 45
(10)
◽
pp. 634-646
2004 ◽
Vol 46
(1)
◽
pp. 38-51
Keyword(s):
2005 ◽
Vol 47
(3)
◽
pp. 220-222