Durability tests on plasma treated surrogate cemented concentrates and resins

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  • NIRAS/ONDRAF

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Abstract

Plasma incineration might be a promising technique for the conditioning of various radioactive waste streams. Assessing the long-term durability of the plasma slag is essential to predict its performance during long-term disposal. In this paper, the stability of six plasma treated surrogate cemented concentrates or resins in a high pH environment is investigated. The slags were crushed (2 different granulometries) and immobilized in a cement matrix, after which samples were submitted to long-term durability tests (stability under water at 20 °C; stability in a high relative humidity environment at 38 °C) and to an accelerated Alkali-Silica-Reaction (ASR) test (1 M NaOH at 80 °C). The first results show that the expansion and strength loss of the cement-slag mixtures remain limited in the test conditions, although differences between the different materials and granulometries could be perceived. No visual damage was observed. Some tests are still ongoing and will last 2 years.

Details

Original languageEnglish
Pages (from-to)149-158
Number of pages10
JournalMRS Advances
Volume5
Issue number3-4
DOIs
Publication statusPublished - 26 Dec 2019
Event2019 - SSNW: Symposium on the Scientific Basis for Nuclear Waste Management - Vienna International Center, Vienna, Austria
Duration: 21 Oct 201924 Oct 2019
https://www.mrs.org/sbnwm-2019

Keywords

  • Plasma incineration, radioactive waste, long-term disposal

ID: 6021291