Gamma irradiation resistance of early age Ba(OH)2-Na2SO4-slag cementitious grouts
Gamma irradiation resistance of early age Ba(OH)2-Na2SO4-slag cementitious grouts
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DOI：
10.1016/j.jnucmat.2016.10.032
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发表时间：
2016-12
影响因子：
3.1
通讯作者：
N. Mobasher;S. A. Bernal;H. Kinoshita;J. Provis
中科院分区：
文献类型：
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作者：
N. Mobasher;S. A. Bernal;H. Kinoshita;J. Provis
早期的Ba（OH）2-Na 2SO 4-矿渣水泥灌浆，制定了固定的硫酸盐轴承核废料的γ射线辐射抗性进行了评估。可观察到的结晶相在加热（50 °C）或在256小时内总剂量高达2.9MGy的γ辐照后没有改变，但辐照样品的抗压强度显著增加。27 Al和29 Si MAS NMR光谱显示主要结合相，水合铝硅酸钙（C-A-S-H）型凝胶，在加热和辐射时具有比参考样品中鉴定的更有序和聚合的结构。这与较高程度的炉渣反应有关。样品配制与废物模拟Na 2SO 4，但没有Ba（OH）2，变得多孔和破裂后加热和照射，但仍保留其抗压强度。在这项工作中评估的Ba（OH）2-Na 2SO 4-矿渣灌浆承受伽马辐照，没有显示出可识别的损坏，因此是一种技术上可行的解决方案，用于固定含硫酸盐的核废料。
The gamma irradiation resistance of early age Ba(OH)2-Na2SO4-slag cementitious grouts, formulated for the immobilisation of sulfate bearing nuclear waste, was assessed. The observable crystalline phases were not modified upon heating (50 °C) or upon gamma irradiation up to a total dose of 2.9 MGy over 256 h, but the compressive strengths of the irradiated samples increased significantly.27Al and29Si MAS NMR spectroscopy showed that the main binding phase, a calcium aluminosilicate hydrate (C-A-S-H) type gel, had a more ordered and polymerised structure upon heating and irradiation compared to that identified in reference samples. This is associated with a higher degree of reaction of the slag. Samples formulated with the waste simulant Na2SO4, but without Ba(OH)2, became porous and cracked upon heating and irradiation, but still retained their compressive strength. The Ba(OH)2-Na2SO4-slag grouts evaluated in this work withstand gamma irradiation without showing identifiable damage, and are thus a technically feasible solution for immobilisation of sulfate-bearing nuclear wastes.