Geopolymers for the Immobilization of Radioactive Waste

Perera, D. S.; Blackford, Mark G.; Vance, E. R.; Hanna, John V.; Finnie, Kim S.; Nicholson, Catherine L.

doi:10.1557/proc-824-cc8.35

Cited by 28 publications

(18 citation statements)

References 2 publications

(2 reference statements)

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“…These processes are responsible for fluctuations of the compressive strength and final strength improvement of the samples when immersed in the magnesium sulfate solution. Ca +2 and Mg +2 ions can be accommodated in aluminasilicate gel as network-modifying cations [39].…”

Section: Effect Of Magnesium Content In Dolomitementioning

confidence: 99%

Review of Dolomite as Precursor of Geopolymer Materials

et al. 2016

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Abstract.Geopolymer is an environmentally friendly cementitious binder that does not require the existence of ordinary Portland cement (OPC). Geopolymer has many excellent advantages, including high early strength, low shrinkage, good thermal resistance and good chemical resistance. Previous commonly used materials include fly ash, clay and slag. The used of dolomite as precursor material in geopolymer field is still new and at the early stage of study. Only a few researchers have done studies on dolomite in geopolymer. Dolomite (CaMg(CO 3 ) 2 ) is abundant and generally inexpensive natural minerals. The possible use of these bulk calcium carbonate materials in improving the mechanical properties of geopolymers will therefore be of great interest. This paper summarizes some research outcomes on dolomite in geopolymer along with the potential of dolomite as geopolymer composites.

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Section: Effect Of Magnesium Content In Dolomitementioning

confidence: 99%

Review of Dolomite as Precursor of Geopolymer Materials

et al. 2016

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“…Cs is very soluble in water and the most difficult radionuclides to immobilize [6]. On the basis of the leaching rate, we can predict percentage of leaching during next the 300 years (10 half-lives of 137 Cs) and at the end of this period radioactivity will have decreased more [7].…”

Section: Radionuclides Leachabilitymentioning

confidence: 99%

The characteristic assessment of spent ion exchange resin from PUSPATI TRIGA REACTOR (RTP) for immobilization process

Othman

Yasir²,

Majid³

et al. 2014

AIP Conference Proceedings

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“…Davidovits (1994aDavidovits ( , 1994bDavidovits ( , 1994c) is attributed with the early development and formulation of geopolymers, for which he has been awarded several patents. Khalil and Merz (1994) and Perera et al (2004) have also studied the formulation and application of geopolymers for waste solidification.…”

Section: Geopolymersmentioning

confidence: 99%

“…The material is largely amorphous with some minor crystalline structure, again dependent on the source materials. Contaminant distribution studies showed that Cs was concentrated in the amorphous phase, while Sr was present in both the amorphous and crystalline phases (Perera et al 2004).…”

Section: Geopolymersmentioning

confidence: 99%

Review of Potential Candidate Stabilization Technologies for Liquid and Solid Secondary Waste Streams

Pierce¹,

Mattigod²,

Westsik³

et al. 2010

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Executive SummaryPacific Northwest National Laboratory has initiated a waste-form testing program to support the longterm durability evaluation of a waste form for secondary wastes generated from the treatment and immobilization of Hanford radioactive tank wastes. The purpose of the work discussed in this report is to identify candidate stabilization technologies and getters that have the potential to successfully treat the secondary waste stream liquid effluent, mainly from off-gas scrubbers and spent solids, produced by the Hanford Tank Waste Treatment and Immobilization Plant (WTP). Down-selection to the most promising stabilization processes/waste forms is needed to support the design of a solidification treatment unit (STU) to be added to the Effluent Treatment Facility (ETF). To support key decision processes, an initial screening of the secondary liquid waste forms must be completed by February 2010. Later, more comprehensive and longer term performance testing will be conducted, following the guidance provided by the secondary waste-form selection, development, and performance evaluation roadmap. The resulting waste form will be compliant to regulations and performance criteria and will lead to cost-effective disposal of the secondary wastes.This report starts with a brief review of some of the most commonly used solidification formulations that would be candidates for secondary liquid waste streams. In this review, the available data on performance are discussed, and some preliminary recommendations are provided for materials that should undergo additional screening testing. We also 1) discuss options for disposal of WTP secondary solid waste streams, 2) provide a brief overview of standard regulatory test methods used for measuring contaminant leachability and waste-form physical strength (with emphasis on the U.S. Environmental Protection Agency's [EPA's] new methods as a screening tool for comparing waste solidification materials of interest), and 3) provide an overview of factors that must be considered in long-term performance testing, including state-of-the-art characterization tools that can provide the data needed to technically defend predictive modeling simulations of long-term material behavior. The long-term wasteform testing and solid and leachate characterization must be robust enough to effectively predict material performance in the Integrated Disposal Facility over the 10,000-year period of performance for the engineered system. The solidification technologies for liquid waste streams include cement/grout, containerized Cast Stone, phosphate-bonded ceramics, alkali-aluminosilicate geopolymers, hydroceramics, L-TEM, and fluidized-bed steam reforming (FBSR). In addition to these, other mature technologies and two compounds, namely goethite and sodalite (that are still being developed), that show considerable promise as waste forms or getters are also discussed. It is our recommendation, based upon the available literature, that Cast Stone, chemically bonded phosphate ceramics (Ceramicrete...

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Geopolymers for the Immobilization of Radioactive Waste

Cited by 28 publications

References 2 publications

Review of Dolomite as Precursor of Geopolymer Materials

Review of Dolomite as Precursor of Geopolymer Materials

The characteristic assessment of spent ion exchange resin from PUSPATI TRIGA REACTOR (RTP) for immobilization process

Review of Potential Candidate Stabilization Technologies for Liquid and Solid Secondary Waste Streams

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