Impact of γ irradiation and thermal aging on the swelling pressure of GMZ bentonite

被引：0
|
作者：
Liu, Wei [1 ,2 ,3 ,4 ]
Liang, Dong [1 ,2 ,3 ,4 ]
Yang, Zhongtian [1 ]
Gao, Chao [1 ,2 ,3 ,4 ]
Xie, Jingli [5 ,6 ]
Jia, Meilan [1 ,2 ,3 ,4 ]
机构：
[1] China Inst Radiat Protect, Taiyuan 030006, Peoples R China
[2] Nucl Facil Decommissioning & Radioact Waste Manage, Taiyuan 030006, Peoples R China
[3] Shanxi Prov Engn Res Ctr Nucl Facil Decommissionin, Taiyuan 030006, Peoples R China
[4] Shanxi Prov Technol Innovat Ctr Nucl Facil Decommi, Taiyuan 030006, Peoples R China
[5] Beijing Res Inst Uranium Geol, Beijing 100029, Peoples R China
[6] CAEA Innovat Geol Disposal High Level Radioact Was, Beijing 100029, Peoples R China
来源：
NUCLEAR ENGINEERING AND DESIGN | 2025年 / 437卷
关键词：
GMZ bentonite; gamma irradiation effect; gamma irradiation-thermal sequential effect; Swelling pressure; Reduction; Oxidation; HYDRO-MECHANICAL BEHAVIOR; CLAY-MINERALS; HYDRAULIC CONDUCTIVITY; COMPACTED BENTONITE; RADIATION; MICROSTRUCTURE; TEMPERATURE; QUARTZ; MONTMORILLONITE; DEFECTS;
D O I：
10.1016/j.nucengdes.2025.114012
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
To investigate the combined effects of gamma irradiation and thermal aging on the swelling pressure of buffer materials used in the geological disposal of high-level radioactive waste, Gaomiaozi (GMZ) bentonite from Inner Mongolia was herein selected. Samples were irradiated by gamma rays and exposed to a combination of gamma irradiation followed by thermal aging at 90 degrees C. Swelling pressure tests were then conducted. Results showed that irradiation and thermal aging reduced the swelling pressure of GMZ bentonite. Notably, after irradiating and storing at (25 +/- 3)degrees C for 360 d, the swelling pressure increased by 51.59 % compared with that of the gamma-irradiated sample; the swelling pressure decreased by 75.9 % for the gamma irradiation-thermal sequentially aged sample (heated for 180 d). Partial chemical-bond destruction, the transformation of structure trivalent to divalent iron, and the water redistribution in the bentonite were the primary drivers of the decrease in the swelling pressure of GMZ bentonite.
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页数：7
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