期刊
CEMENT AND CONCRETE RESEARCH
卷 100, 期 -, 页码 110-118出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2017.05.022
关键词
Cement paste; Radiolysis; H-2 production; First-principles calculations; Reaction mechanisms
资金
- NEEDS MIPOR
- NEEDS Dechets programs
- Schlumberger-MIT cement research collaboration X-Cem
- UK CarParrinello Consortium through EPSRC [EP-K013459/1]
- EPSRC [EP/K013459/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [1494388, EP/K013459/1] Funding Source: researchfish
Long-term confinement of nuclear waste is one of the main challenges faced by the nuclear industry. Fission products such as Sr-90 and Cs-137, both beta(-) emitters known to induce serious health hazards, represent the largest fraction of nuclear waste. Cement is a good candidate to store them, provided it can resist the effects of irradiation over time. Here, we have investigated the effects of beta(-) decay on cement by performing electron irradiation experiments on different samples. We show that H-2 production in cement, the main effect of water radiolysis, depends strongly on composition and relative humidity. First-principles calculations indicate that the water-rich interlayer regions with Ca2+ ions act as electron traps that promote the formation of H-2. They also show that holes localize in water-rich regions in low Ca content samples and are then able to participate in H-2 production. This work provides new understanding of radiolysis effects in cements.
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