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Sensors 2017, 17(8), 1817;

Evaluation of Early-Age Concrete Compressive Strength with Ultrasonic Sensors

Structural Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology, 283 Goyangdae-Ro, Ilsanseo-Gu, Goyang-Si, Gyeonggi-Do 10223, Korea
Department of Civil Engineering, Hongik University, 94 Wausan-ro, Mapo-gu, Seoul 04066, Korea
Department of Civil and Environmental Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
Author to whom correspondence should be addressed.
Received: 17 June 2017 / Revised: 30 July 2017 / Accepted: 2 August 2017 / Published: 7 August 2017
(This article belongs to the Section Physical Sensors)
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Surface wave velocity measurement of concrete using ultrasonic sensors requires testing on only one side of a member. Thus, it is applicable to concrete cast inside a form and is often used to detect flaws and evaluate the compressive strength of hardened concrete. Predicting the in situ concrete strength at a very early stage inside the form helps with determining the appropriate form removal time and reducing construction time and costs. In this paper, the feasibility of using surface wave velocities to predict the strength of in situ concrete inside the form at a very early stage was evaluated. Ultrasonic sensors were used to measure a series of surface waves for concrete inside a form in the first 24 h after placement. A continuous wavelet transform was used to compute the travel time of the propagating surface waves. The cylindrical compressive strength and penetration resistance tests were also performed during the test period. Four mixtures and five curing temperatures were used for the specimens. The surface wave velocity was confirmed to be applicable to estimating the concrete strength at a very early age in wall-like elements. An empirical formula is proposed for evaluating the early-age compressive strength of concrete considering the 95% prediction intervals. View Full-Text
Keywords: ultrasonic sensors; surface wave velocity; early-age concrete; compressive strength ultrasonic sensors; surface wave velocity; early-age concrete; compressive strength

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Yoon, H.; Kim, Y.J.; Kim, H.S.; Kang, J.W.; Koh, H.-M. Evaluation of Early-Age Concrete Compressive Strength with Ultrasonic Sensors. Sensors 2017, 17, 1817.

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