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1 Lee, Kyungbae ( kblee6078@ex.co.kr) Lee, Jaehoon ( ranian74@ex.co.kr) Sohn, Duecksu ( mgsds@ex.co.kr) Kwon, Soonmin ( soonmini2@ex.co.kr) ABSTRACT PURPOSES : The purpose of this article is to compare and evaluate the riding comfort of a passenger in tunnels depending on different surface textures of concrete pavement. METHODS : Evaluation of riding comfort is conducted at 17 sections, which have different surface texture such as transverse tinned(tt), longitudinal tinned(lt) and diamond grinded(dg). A triaxial accelerometer was set up on the passenger seat surface of the test vehicle to measure vibrations of an occupant, then the effects of vibration on comfort and health were evaluated by ISO And microphones were installed at passenger's ears height to measure sound pressure level(spl) in the test vehicle. Additionally, a surface microphone was installed on the inside of wheel arch to evaluate noise between tire and pavement by NCPX method. All tests were conducted cruising at 100km/h. RESULTS : The results of all tests are as follows. First, both vibration magnitudes for comfort and for health in LT and DG sections are almost same and they represent lower than those in TT sections. Second, the average SPL of DG shows the lowest decibels among them. And third, it is founded that interior noise is significantly affected by noise between tire and pavement. CONCLUSIONS : It may be concluded that DG can provide more excellent riding comfort to passenger than LT or TT. Therefore, it is necessary to consider applying DG to existing pavement surface to improve surface condition when the driving environment especially requires riding comfort like a long tunnel. Keywords riding comfort, surface texture, concrete pavement, tunnel, vibration, noise Corresponding Author : Lee, Kyungbae, Contract Researcher Pavement Research Division, Korea Expressway Corporation Research Institute, , Dongbu-daero 922 beon-gil, Dongtan-myeon, Hwaseong-Si, Gyeonggi-Do, , Korea Tel : Fax : kblee6078@ex.co.kr International Journal of Highway Engineering ISSN (print) ISSN (Online) 155

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10 Cho, D-S, Mun, S, 2008, Determination of the sound power levels emitted by various vehicles using a novel testing method, Applied Acoustics, Vol Dukkipati, R.V. et al. 2008, Road Vehicle Dynamics, Society of Automotive Engineers International, ISBN Expressway Construction Guide Specification, 2012, Korea Expressway Corporation Gillespie T.D., 1992, Fundamentals of Vehicle Dynamics, Society of Automotive Engineers, ISBN Han, B-K et al., 2013, A study of eliminating the vehicle noise of engine RPM from the friction noise between tire and road pavement by using a NCPX method, International Journal of Highway Engineering, Vol. 15. No ISO , 1997, Mechanical vibration and shock - Evaluation of human exposure to whole-body vibration Part 1 : General requirements, International Organization for Standardization Kim, C et al., 2013, Analysis of Tunnel Noise Reduction by the Pavements and Wall Absorption, Korean Society for Noise and Vibration Engineering, Annual Autumn Conference MEL, 2013, Occupational Safety and Health Act, Ministry of Employment and Labor, Korea NIOSH, 1998, Occupational Noise Exposure, Criteria for a recommended standard, National Institute for Occupational Safety and Health, Department of Health and Human Services, U.S. Sandberg, Ulf, 2001, Tyre/Road Noise - Myths and Realities, VTI sätryck 345, Swedish National Road and Transport Research Institute 164 International Journal of Highway Engineering Vol.16 No.5

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Æ÷Àå½Ã¼³94š Cho, Mun Jin (E-mail: mjcho@ex.co.kr) ABSTRACT PURPOSES : The performance of tack coat, commonly used for layer interface bonding, is affected by application rate and curing time. In this study, bonding