| Budget Amount *help |
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2021: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2020: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2019: ¥7,540,000 (Direct Cost: ¥5,800,000、Indirect Cost: ¥1,740,000)
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| Outline of Final Research Achievements |
A monitoring system for concrete hardening using laser excitation/measurement was developed in this study. Aluminum (Al) beam inserted in mortar was used as measurement object. Laser beam was irradiated to the Al beam to excite the vibration due to laser ablation and its frequency spectra were measured. It was confirmed that the characteristics on the resonance frequency and damping of the Al beam change as the mortar hardens over time. Moreover, it was found by the finite element analysis that there is a relationship between the hardness of the mortar and the natural frequency of the Al beam inserted in the mortar. By comparing the theoretically calculated frequency with the experimental result, the elastic modulus of the mortar and its variation with time could be estimated. The effectiveness of the developed monitoring system for concrete hardening was verified by some experiments.
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