Potential Use of Ambient-Cured Geopolymers for Intermediate Level Nuclear Waste Storage
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MRS Advances © 2018 Materials Research Society DOI: 10.1557/adv.2018.276
Potential Use of Ambient-Cured Geopolymers for Intermediate Level Nuclear Waste Storage Supphatuch Ukritnukun1*, Charles Christopher Sorrell1, Daniel Gregg2, Eric R. Vance2, and Pramod Koshy1
1) School of Materials Science and Engineering, UNSW Sydney, Sydney, NSW 2052, Australia;
2) Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia
*Email: [email protected]
Abstract
There is growing interest in reducing the use of ordinary Portland cement (OPC) owing to its high energy consumption and CO2 emissions. An environmentally-friendly alternative is the use of geopolymers, which can potentially reduce direct CO2 emissions through the appropriate choice of raw materials, mix design, and curing regimes. In this regard geopolymer mortars are also realistic candidates for the replacement of OPC mortars in nuclear waste immobilisation applications as they provide a more durable incorporation matrix as well as suppressing the formation of radiolytic hydrogen. The advantages of geopolymers over OPC for nuclear waste immobilisation include i) lower water content as alkaline activator is the main component that drives geopolymerisation, ii) higher thermal stability (
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