Abstract
Carbonation is inevitable for cement and concrete in repositories over an extended period of time. This study investigated the carbonation-induced weathering effect on cesium retention of cement. Cement paste samples were exposed to accelerated carbonation for different durations to simulate the extent of weathering among samples. The extent of carbonation in cement was characterized by XRD, TG and NMR spectroscopy, while the retention capacity for cesium was investigated by zeta potential measurement and batch adsorption tests. Though carbonation led to decalcification from the binder gel, it negatively charged the surface of cement hydrates and enhanced their cesium adsorption capacity.
| Original language | English |
|---|---|
| Pages (from-to) | 159-164 |
| Number of pages | 6 |
| Journal | Journal of Nuclear Materials |
| Volume | 505 |
| DOIs | |
| State | Published - Jul 2018 |
| Externally published | Yes |
UN SDGs
This output contributes to the following UN Sustainable Development Goals (SDGs)
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SDG 12 Responsible Consumption and Production
Keywords
- Adsorption
- Cement
- Engineered barrier
- Radioactive waste disposal
- Weathering
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