The Intermediate Level Wastes (ILW), produced during the reprocessing of spent nuclear fuel, are ... more The Intermediate Level Wastes (ILW), produced during the reprocessing of spent nuclear fuel, are commonly encapsulated in a blast furnace slag (BFS) and Portland cement (PC) composite and stored in repositories. These cements are required to safely immobilise these wastes for long durations of time. Additives are used in the cementitious wastes to further enhance them for example superplasticisers are used in general cement industry to increase fluidity, resulting in large reductions of water required for mixing, giving high early strength development, a decrease in permeability and ultimately significant reduction in costs. However superplasticisers contain molecules that can complex insoluble radioelements such as plutonium and uranium increasing their solubility and in turn mobility. This can be problematic while the cementitious wastes are stored. The standard storage conditions in the UK are that a cement is stored in a steel canister, then a backfill cement such as NRVB (Nirex...
The Intermediate Level Wastes (ILW), produced during the reprocessing of spent nuclear fuel, are ... more The Intermediate Level Wastes (ILW), produced during the reprocessing of spent nuclear fuel, are commonly encapsulated in a blast furnace slag (BFS) and Portland cement (PC) composite and stored in repositories. These cements are required to safely immobilise these wastes for long durations of time. Additives are used in the cementitious wastes to further enhance them for example superplasticisers are used in general cement industry to increase fluidity, resulting in large reductions of water required for mixing, giving high early strength development, a decrease in permeability and ultimately significant reduction in costs. However superplasticisers contain molecules that can complex insoluble radioelements such as plutonium and uranium increasing their solubility and in turn mobility. This can be problematic while the cementitious wastes are stored. The standard storage conditions in the UK are that a cement is stored in a steel canister, then a backfill cement such as NRVB (Nirex...
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