Special act on the safety management of facilities, Korea Ministry of Government Legislation, 16497

Kim, Y. C., Shim, G. S., Kwon, S. G., Park, S. B., Back, I. C. (2017), Investigation for defect status of PSC sleeper on ballast track of high-speed railroad, 2017 Conference Proceeding Paper of the Korean Society For Railway Busan, 1039-1043.

Bae, Y., Bae, J. H., Kim, M. C., Jang, S. Y. (2018), Flexural strength of cracked prestressed concrete sleepers used on gyeonbu high speed line, Journal of the Korean Society for Railway, 21(9), 900-915.

Kim, J., Bae, Y., Yi, N. (2020), Delayed ettringite formation damage in prestressed concrete sleepers on gyeonbu high speed line, Journal of the Korean Society for Railway, 23(2), 97-108.

KS F 2730, Testing method for rebound number to conclude compressive strength of concrete, KSA

KS F 2418, T Standard test method for ultrasonic velocity of concrete, KSA

Malhotra, V. M., Carino, N. J. (2004), Handbook on nondestructive testing of concrete ASTM, 2nd ed, CRC Press

Zhu, J. (2005), Non-contact NDT of concrete structures using air-coupledsensors, Doctoral dissertation, Univ. of Illinois Urbana-Champaign, UrbanaChampaign, IL

Ryden, N., Lowe, M. J. S., Cawley, P. (2008), Non-contact surface wave scanning of pavements using a rolling microphone array, Review of Progress in Quantitative Nondestructive Evaluation, Thompson DO, Chimenti DE, eds.; Amer Inst Physics, Melville, 27a and 27b(975), 1328-1332.

Kee, S. H., Oh, T., Popovics, J. S., Arndt, R. W., Zhu, J. (2012), Nondestructive bridge deck testing with air-coupled impact-echo and infrared thermography, Journal of bridge engineering ASCE, inpress

Viktorov, I.A. (1967), Rayleigh and Lamb Waves – Physical Theory and Applications, Plenum Press, New York

Chung, C., Suraneni, P., Popovics, J. S., Struble, L. J. (2012), Setting time measurement using ultrasonic wave reflection, ACI Materials Journal, 19(12), 109-117.

Oh, T., Kee, S. H., Arndt, R., Popovics, J. S., Zhu, J. (2013), Comparison of NDT Methods for Assessment of a Concrete Bridge Deck, Journal of Engineering Mechanics, 139(3), 305-314.

Choi, H., Hmin, S., Tran, Q., Roesler, J. R., Popovics, J. S. (2016), Contactless system for continuous monitoring of early-age concrete properties, Construction International, 38(9), 38-41.