2015 Fiscal Year Final Research Report
Verification of risk of crack caused by delayed ettringite formation in massive concrete in Japan
| Project/Area Number |
25420457
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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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 | Iwate University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | エトリンガイト遅延生成 / 耐久性 / ひび割れ / マスコンクリート / エトリンガイト / コンクリート温度 |
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| Outline of Final Research Achievements |
Recently, the concrete maximum temperature due to the adiabatic temperature rise caused by the heat of cement hydration should be specified under about 70 °C in guideline to produce the massive concrete in France, the U.S., considering to restrain the expansion caused by crack of delayed ettringite formation DEF. In this research, it is researched whether DEF cracking the massive concrete in Japan prepared by Japanese resources would be appeared or not, comparing the concrete in the Europe and the U.S. The discussion is still necessary about whether or not it should introduce a countermeasure against DEF to guideline against the crack in the mass concrete in our country. However in the Europe and the U.S., it prescribes the maximum-temperature of concrete from the concerns and the risk lowering means of DEF is taken. On the mass concrete in Japan, some countermeasure should be discussed and specified to restrain DEF crack. The continuous research is also necessary in the future.
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| Free Research Field |
土木材料
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