2016 Fiscal Year Final Research Report
Investigation on the mechanism of reducing fire spalling by fibre mixing to high-strength concrete
| Project/Area Number |
26630263
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Architectural environment/Equipment
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | 高強度コンクリート / 爆裂 / 空隙圧力 / 熱応力 / 繊維補強 |
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| Outline of Final Research Achievements |
Spalling of high strength concreate is a dangerous phenomenon. The occurrence mechanism is not well understood. If surface layer of concrete is lost by spalling, reinforcing bars may be exposed to fire directly. Then the possibility of failure would be increased. To reduce the degree of spalling, Inclusion of polypropylene fiber is effective. However, the measure is not based on the mechanism of spalling. The universality is still in question. In this study, heat and mass transfer analysis and hygro-thermal analysis were carried out to calculate pore pressure rise inside material and compressive stress at heated surface. The effect of fiber was considered through changes in material properties. As a result, pore pressure exceeds the tensile stress if both concrete strength and pore saturation are high.
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| Free Research Field |
火災安全工学
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