| Project/Area Number |
21560492
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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 | Hakodate National College of Technology |
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Principal Investigator |
SAWAMURA Syuji 函館工業高等専門学校, 環境都市工学科, 教授 (70321362)
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| Co-Investigator(Renkei-kenkyūsha) |
MARUYAMA Kyuichi 長岡技術科学大学, 工学部, 教授 (30126479)
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2011: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2010: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2009: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 若材齢コンクリート / 超音波速度 / 骨材容積率 / アーレニウスプロット / 有効材齢 / 動弾性係数 / 粗骨材粒子サイズ / プロクター貫入抵抗 |
|---|
| Research Abstract |
The composition of a concrete material, like sand-aggregate ratio or coarse aggregate content, strongly influences ultrasonic wave velocity of concrete. In early age concrete with small cement matrix strength, the tendency is more remarkable. Therefore, in order to generalize the measurement technique by the ultrasonic wave velocity, it is necessary to evaluate the influence of the aggregate content. In this study, the model assumed that the ultrasonic velocity of aggregate influenced ultrasonic velocity of concrete by the percentage of the aggregate volume content. And, we tried the quantification of the influence that the aggregate content exerted on ultrasonic velocity of concrete. In addition, based on those results, we proposed the technique for evaluating the change in the stiffness coefficient of the early age concrete from the measurement result of a ultrasonic wave velocity of concrete.
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