비파괴시험에 의한 콘크리트 초음파속도의 재령계수 산정
Calculation of Aging Effects of Ultrasonic Pulse Velocity in Concrete by Non-Destructive Test
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This paper aims to calculate age coefficient of ultrasonic pulse velocity by non-destructive test. When concrete compressive strength is measured by non-destructive test, rebound test hammer method is applied to estimate age coefficient depending on the course of time after concrete casting, but ultrasonic pulse velocity method is not applied in the process. Although it is necessary to consider age coefficient with change of ultrasonic pulse velocity of concrete depending on aging, there have been little attempts to apply that method. The experiments were conducted to calculate aging effects which will be applied to establish the formula of measuring concrete strength. As a result of experiments, it was found that ultrasonic pulse velocity showed radical changes depending on concrete hardening in comparison with initial standard values. So, it was concluded that age coefficient must be applied to calculate strength. In conclusion, age coefficient of ultrasonic pulse velocity of concrete was suggested on the basis of experimental results.
Abstract
This paper aims to calculate age coefficient of ultrasonic pulse velocity by non-destructive test. When concrete compressive strength is measured by non-destructive test, rebound test hammer method is applied to estimate age coefficient depending on the course of time after concrete casting, but ultrasonic pulse velocity method is not applied in the process. Although it is necessary to consider age coefficient with change of ultrasonic pulse velocity of concrete depending on aging, there have been little attempts to apply that method. The experiments were conducted to calculate aging effects which will be applied to establish the formula of measuring concrete strength. As a result of experiments, it was found that ultrasonic pulse velocity showed radical changes depending on concrete hardening in comparison with initial standard values. So, it was concluded that age coefficient must be applied to calculate strength. In conclusion, age coefficient of ultrasonic pulse velocity of concrete was suggested on the basis of experimental results.
참고문헌 (10)
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- 日本建築學會, "コンクリ-ト强度推定のための非破壞試驗方法マニュアル", ~ (1983)
- Yiching Lin, "Prediction of Ultrasonic Pulse Velocity(UPV) in Concrete", ACI Materials Journal, 100(1), pp.21~28 (2003)
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- "The measurement of the velocity of ultrasonic pulse in concrete Brithish Standard BS 4408, Part 5", ~ (1974)
- "Testing concrete by the ultrasonic pulse method RILEM, Recommendation NDT 1", ~ (1972)