| Project/Area Number |
60850091
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
コンクリート工学・土木材料・施工
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| Research Institution | Hokkaido University |
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Principal Investigator |
SUGAWARA Teruo Fac. of Engineering, Hokkaido University, 工学部, 教授 (90001065)
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| Co-Investigator(Kenkyū-buntansha) |
高橋 将 北海道大学, 工学部, 教務職員
KAMIJIMA Tsuyoshi Fac. of Engineering, Hokkaido University, 工学部, 助手 (60001228)
MORIYOSHI Akihiro Fac. of Engineering, Hokkaido University, 工学部, 助教授 (50002051)
TAKAHASHI Masaru Fac. of Engineering, Hokkaido University
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| Project Period (FY) |
1985 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥10,500,000 (Direct Cost: ¥10,500,000)
Fiscal Year 1986: ¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 1985: ¥6,000,000 (Direct Cost: ¥6,000,000)
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| Keywords | asphalt / low temperature / asphalt stiffness / thermal stress / asphaltic mixture / 破壊 / 応力緩和 / 疲労破壊 |
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| Research Abstract |
A great amount of transverse cracking recentry appeared in asphalt pavements in severely cold regions in Hokkaido. It is one of the technically-serious problems. The authors carried out both field surveys and basic investigations on mechanical properties of asphaltic mixtures and have reached some conclusions on the mechanism of the failure of pavements arising from low temperature transverse cracking.
A laboratory investigation has been conducted to evaluate the asphalt properties in temperature-induced stress and fracture in conjunction with the field survey. This investigation has shown that the fracture temperature of asphalt concrete depends both on its penetration and its temperature susceptibility. As the result of direct thermal fracture tests, a prediction method of probable fracture temperature was established. This approach is basically a variation of the limiting stiffness approach based on the direct thermal fracture test and asphalt stiffness. And also, a prediction nomograph based on penetration, softening point and penetration index of asphalt. This nomograph is in fairly good agreement with the fracture test results.
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