| Project/Area Number |
24686064
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Partial Multi-year Fund |
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| Research Field |
Building structures/materials
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| Research Institution | Tokyo University of Science |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥26,650,000 (Direct Cost: ¥20,500,000、Indirect Cost: ¥6,150,000)
Fiscal Year 2013: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
Fiscal Year 2012: ¥19,890,000 (Direct Cost: ¥15,300,000、Indirect Cost: ¥4,590,000)
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| Keywords | 中性子ラジオグラフィ / 高強度コンクリート / 爆裂 / 水分挙動 / 高温作用 / 水分移動 |
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| Research Abstract |
The physico-chemical process of the spalling phenomena is assumed to be doe to the moisture pressure build-up inside the pore structures, restrained thermal interaction or simultaneous action of both. Also, it can't be ignored that the influence of dehydrated water under high temperatures from cement hydrate, such as CSH and calcium hydrate.
In this research, we applied neutron radiography to detect the hydraulic behavior under high temperatures to understand the spalling phenomenon of high strength concrete, focusing on the difference of mix proportions and dry
conditions. The moment of spallation of ordinary concrete can be observed by the neutron radiography, and the moisture behavior under the fire condition can be examined by the intensity analysis of the images. And also, the result by TNRF clearly showed that water condensed as moisture clog in the region at a temperature of 100 degrees Celsius.
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