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Potential Use of Ambient-Cured Geopolymers for Intermediate Level Nuclear Waste Storage

Published online by Cambridge University Press:  16 March 2018

Supphatuch Ukritnukun ,
Charles Christopher Sorrell ,
Daniel Gregg ,
Eric R. Vance  and
Pramod Koshy
Supphatuch Ukritnukun*
Affiliation:
School of Materials Science and Engineering, UNSW Sydney, Sydney, NSW2052, Australia;
Charles Christopher Sorrell
Affiliation:
School of Materials Science and Engineering, UNSW Sydney, Sydney, NSW2052, Australia;
Daniel Gregg
Affiliation:
Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW2234, Australia
Eric R. Vance
Affiliation:
Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW2234, Australia
Pramod Koshy
Affiliation:
School of Materials Science and Engineering, UNSW Sydney, Sydney, NSW2052, Australia;
*
*Email: [email protected]
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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 (<600°-800°C) compared to OPC concrete (<300°C), iii) higher compressive strength (50-80 MPa), and iv) lower leachability of radioactive ions when the mix design and curing temperature are appropriately balanced. UNSW and ANSTO have embarked on a long-term research program to investigate the possibility of using geopolymers for the immobilisation of Intermediate Level Liquid Waste (ILLW), the focus of which will be around the influence of gamma-irradiation on the durability.

Keywords

cement &concretenuclear materials
Type
Articles
Information
MRS Advances , Volume 3 , Issue 20: Scientific Basis for Nuclear Waste Management XLI , 2018 , pp. 1123 - 1131
Copyright
Copyright © Materials Research Society 2018 

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References

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