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Probing the water phases and microstructure in a model cement blend matrix used for the encapsulation of intermediate level nuclear wastes

Gorce, JP, Milestone, NB and McDonald, PJ (2006) Probing the water phases and microstructure in a model cement blend matrix used for the encapsulation of intermediate level nuclear wastes Materials Research Society Symposium Proceedings, 932. pp. 767-774.

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Abstract

The changes in microstructure and content of water phases during hydration of a 3:1 BFS:OPC blend are investigated by Mercury Intrusion Porosimetry (MIP), freeze-drying, Thermal Gravimetric Analysis (TGA) and 1H Nuclear Magnetic Resonance (NMR) relaxometry. MIP indicates that during the blend hydration, a reduction in the population of capillary pores (larger than about 100 nm) occurs while the population of gel pores (smaller than few tens of nanometres) increases. Between 3 and 90 days, the porosity estimated by MIP decreases from about 36% down to 18% while the median pore size decreases from about 140 nm down to 6 nm. 1HNMR relaxometry shows that after 1 day of hydration, nearly 70% of the evaporable water is held in capillary pores while about 30% is present in gel pores. After two weeks, most of the evaporable water (90%) is found in pores smaller than few tens of nanometres. : The amount of evaporable water detected by freeze drying decreases from less than 20 wt.% after one week of hydration down to about 16.3 wt.% after 90 days while the amount of chemical ly bound water related to the degree of advancement of the cement hydration and detected by TGA increases from 8 wt.% to 10.3 wt.%. During hydration the BFS:OPC blend matrix evolves from an open microporous network to one of a poorly connected network of water rich nanopores with increasing amounts of chemically bound water. © 2006 Materials Research Society.

Item Type: Article
Authors :
NameEmailORCID
Gorce, JPUNSPECIFIEDUNSPECIFIED
Milestone, NBUNSPECIFIEDUNSPECIFIED
McDonald, PJp.mcdonald@surrey.ac.ukUNSPECIFIED
Date : 24 July 2006
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 11:20
Last Modified : 17 May 2017 14:55
URI: http://epubs.surrey.ac.uk/id/eprint/830975

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