TY - JOUR
T1 - Chemistry and performance of blended cements and backfills for use in radioactive waste disposal
AU - Duerden, S.
AU - Glasser, F. P.
AU - Goldthorpe, K.
AU - Pedersen, J.
AU - Quillin, K.
AU - Ross, D.
AU - Stronach, S. A.
AU - Tyrer, M.
PY - 1996
Y1 - 1996
N2 - The 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 1.5 M, 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.
AB - The 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 1.5 M, 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.
UR - http://www.scopus.com/inward/record.url?scp=0030706320&partnerID=8YFLogxK
U2 - 10.1557/PROC-465-287
DO - 10.1557/PROC-465-287
M3 - Article
VL - 465
JO - Materials Research Society Symposium Proceedings
JF - Materials Research Society Symposium Proceedings
M1 - 287
ER -