The effects of alpha radiation on cementitious systems used for nuclear waste encapsulation, and the subsequent physico-chemical properties, have been subject to limited investigation comparative to the effects of gamma and neutron irradiations. This paper outlines an assessment of the impact of PuO₂ incorporation on the bulk characteristics of BFS and PFA blended Portland cements, with specific focus on the microstructure, phase assemblage and the radiolysis of pore water. Cellulose was also added to the cements to investigate the effects of organics on these systems. Characterisation of the bulk phase assemblage and microstructure were completed using optical and scanning electron microscopy (SEM), x-ray diffraction (XRD), and thermogravimetric analysis (TGA). Gas evolution was measured to determine the radiolytic breakdown of pore solution. In all samples the PuO₂ appeared well encapsulated, with good physical contact to the cement grout and no large scale defects observed. Pu-containing hydrates were not observed, but PuO₂ containing BFS based systems showed variations in the ratio of sulfate-containing phases, with increased ettringite observed. Gas evolution results were consistent with expectations based on likely radiation deposition, and increased G(H₂) values were observed for cellulose containing samples. The findings of this study suggest the investigated cements are suitable encapsulants matrices for wastes containing PuO₂.

与伽马和中子辐射的影响相比，α辐射对用于核废料封装的胶结系统的影响以及随后的理化性质受到了有限的研究。本文概述了对PuO ₂影响的评估结合了BFS和PFA混合波特兰水泥的体积特征，特别关注孔隙水的微观结构，相组合和辐射分解。还向水泥中添加了纤维素，以研究有机物对这些系统的影响。使用光学和扫描电子显微镜（SEM），X射线衍射（XRD）和热重分析（TGA）来完成对本体相组装和微观结构的表征。测量气体逸出以确定孔溶液的辐射分解。在所有样品中，PuO ₂似乎都被很好地封装，与水泥浆具有良好的物理接触，并且没有观察到大规模的缺陷。未观察到含Pu的水合物，但存在PuO _2。含有BFS的体系显示出含硫酸盐相的比例变化，观察到钙矾石增加。气体逸出结果与基于可能的辐射沉积的预期结果一致，并且对于含纤维素的样品观察到G（H ₂）值增加。这项研究的结果表明，所研究的水泥是适用于含PuO ₂废物的密封剂基质。