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Appl. Sci. 2017, 7(12), 1249; https://doi.org/10.3390/app7121249

Estimation of Compressive Strength of High Strength Concrete Using Non-Destructive Technique and Concrete Core Strength

1
Department of Civil and Environmental Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea
2
Department of Civil Engineering, Gyeongnam National University of Science and Technology, 150 Chilam-dong, Jinju, Gyeongnam 52725, Korea
*
Author to whom correspondence should be addressed.
Received: 16 October 2017 / Revised: 29 November 2017 / Accepted: 30 November 2017 / Published: 2 December 2017
(This article belongs to the Section Mechanical Engineering)
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Abstract

Estimating the compressive strength of high strength concrete (HSC) is an essential investigation for the maintenance of nuclear power plant (NPP) structures. This study intends to evaluate the compressive strength of HSC using two approaches: non-destructive tests and concrete core strength. For non-destructive tests, samples of HSC were mixed to a specified design strength of 40, 60 and 100 MPa. Based on a dual regression relation between ultrasonic pulse velocity (UPV) and rebound hammer (RH) measurements, an estimation expression is developed. In comparison to previously published estimation equations, the equation proposed in this study shows the highest accuracy and the lowest root mean square error (RMSE). For the estimation of compressive strength using concrete core specimens, three different concrete core diameters were examined: 30, 50, and 100 mm. Based on 61 measured compressive strengths of core specimens, a simple strength correction factor is investigated. The compressive strength of a concrete core specimen decreases as the core diameter reduces. Such a relation is associated with the internal damage of concrete cores and the degree of coarse aggregate within the core diameter from the extracting process of the cores. The strength estimation expressions was formulated using the non-destructive technique and the core strength estimation can be updated with further test results and utilized for the maintenance of NPP. View Full-Text
Keywords: high strength concrete; nuclear power plant; estimation of compressive strength; Nondestructive test; dual regression; concrete core; strength correction factor high strength concrete; nuclear power plant; estimation of compressive strength; Nondestructive test; dual regression; concrete core; strength correction factor
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Ju, M.; Park, K.; Oh, H. Estimation of Compressive Strength of High Strength Concrete Using Non-Destructive Technique and Concrete Core Strength. Appl. Sci. 2017, 7, 1249.

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