2011 Fiscal Year Final Research Report
Long-term Deterioration Mechanisms of Hardened Cement Pastes due to High Concentration Alkali Salt Solution in Radioactive Waste Materials and Its Proposal for Mitigation Countermesure
| Project/Area Number |
21560483
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Civil engineering materials/Construction/Construction management
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| Research Institution | Kanazawa University |
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Principal Investigator |
TORII Kazuyuki 金沢大学, 環境デザイン学系, 教授 (50115250)
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| Co-Investigator(Kenkyū-buntansha) |
MIHARA Morihiro 独立行政法人日本原子力研究開発機構, 地層処分研究開発部門, 副主任研究員 (00421652)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 放射性廃棄物 / ASR抑制対策 / ナトリウム塩 / 膨張機構 / ポゾラン材料 |
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| Research Abstract |
In this research, the mechanisms of alkali-silica reaction(ASR) in concrete induced by high concentration solutions of sodium salts were investigated. For this purpose, the expansion behavior of mortar bars immersed in various sodium salts was experimentally compared. In sodium nitrate and sodium sulfate solutions, the process of formation of complex compound hydrates and thereby the rise in the concentration of hydroxide ion was the main reason of ASR. Furthermore, the addition of large amounts of fly ash and blast-furnace slag was very effective in controlling the expansion of mortar bars.
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