期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 318, 期 -, 页码 339-346出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2016.07.003
关键词
Cesium; Strontium; Solidification; Geopolymer; Diffusivity
资金
- National Research Foundation of Korea (NRF) - Korean government [2015R1A2A1A10055694]
- National Research Foundation of Korea [2015R1A2A1A10055694] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The present study investigates the physical barrier effect of geopolymeric waste form on leaching behavior of cesium and strontium. Fly ash-based geopolymers and slag-blended geopolymers were used as solidification agents. The leaching behavior of cesium and strontium from geopolymers was evaluated in accordance with ANSI/ANS-16.1. The diffusivity of cesium and strontium in a fly ash-based geopolymer was lower than that in Portland cement by a factor of 103 and 104, respectively, showing significantly improved immobilization performance. The leaching resistance of fly ash-based geopolymer was relatively constant regardless of the type of fly ash. The diffusivity of water-soluble cesium and strontium ions were highly correlated with the critical pore diameter of the binder. The critical pore diameter of the fly ash-based geopolymer was remarkably smaller than those of Portland cement and slag-blended geopolymer; consequently, its ability physically to retard the diffusion of nuclides (physical barrier effect) was superior. (C) 2016 Elsevier B.V. All rights reserved.
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