Browse > Article
http://dx.doi.org/10.7855/IJHE.2014.16.6.059

Analysis of Longitudinal Steel Behaviors of Continuously Reinforced Concrete Pavement at Early Age  

Nam, Jeong-Hee (Highway pavement research division, SOC research Institute Korea Institute of Construction Technology)
Jeon, Sung Il (Highway pavement research division, SOC research Institute Korea Institute of Construction Technology)
Publication Information
International Journal of Highway Engineering / v.16, no.6, 2014 , pp. 59-67 More about this Journal
Abstract
PURPOSES : The purpose of this study is to analyse the longitudinal steel strain and stress of continuously reinforced concrete pavement(CRCP) with longitudinal and transverse direction at early age using stress dependent strain analysis method. METHODS : To measure the longitudinal steel strain, 9-electrical resistance and self-temperature compensation gauges were installed to CRCP test section (thickness = 250mm, steel ratio = 0.7%) and continuously measured 10min. intervals during 30days. In order to properly analyze the steel stress first, temperature compensation process has been conducted. Secondly, measured steel strains were divided into stress dependent strain (elastic strain) and stress independent strain (thermal strain) and then stress dependent strain was applied to stress calculation of longitudinal steels. RESULTS : Steel strains were successfully measured during 30days. To verify the accuracy of temperature compensation process, measured coefficient of thermal expansion(COTE,$11.46{\times}10^{-6}m/m/^{\circ}C$) of longitudinal steel before paving was compared with that of unrestrained steel. Max. steel stress in the transverse direction shows about 266MPa at 23days after placement. CONCLUSIONS : Steel stresses in the longitudinal and transverse direction have been evaluated. In longitudinal direction, steel stress from the crack was rapidly reduced from 183MPa at crack to 18MPa from 600mm apart the crack. From this observation, stress effective length can be identified as within 600mm apart from the crack. In transverse direction, max. stress point was located near the center of pavement width and stress level(266MPa) is about 66% of yield stress of steel.
Keywords
continuously reinforced concrete pavement(CRCP); longitudinal steel stress; longitudinal steel strain; early-age behaviors;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 AASHTO (1981). AASHTO Interim Guide for Design of PAvement Structures, Chaper 3 revised, America Association of State and Highway Transportation Officials. Washington., D.C.
2 Bazant, Z.P.,(1988) Mathematical Modeling of Creep and Shrinkage of Concrete, John Wiley and Sons
3 FHWA (1990). Continuously Reinforced Concrete Pavement, Technical Advisory, T 5080.14, Federal Highway Administraion, D.C.
4 Http://www.fhwa.dot.gov/pavement/t508014.cfm
5 Finke, T.E., & Heberling, T.G. (1978). Determination of thermal-expansion characteristics of metals using strain gages. Experimental Mechanics, 155-158.
6 Jeon, B. J., et al (2014). Evaluation of Field application using Mechanical Placement Method for CRCP, 2014 Fall conference of The Korean Society of Road Engineers. 18.
7 Kim, J. W., et al. (2002). Research of construction and operation of Korea Road Test Bed. Expressway & Transportation Research Institute, Http://research.ex.co.kr/file_03/LIB/OTKHRP500316/OTKHRP500316.xml
8 Kyowa Electronic Instruments (2005). What's a strain gage. KYOWA Electronic Instruments Co., LTD.
9 McCullough, B.F., Ma, J.C.M., and Noble, C.S.(1979) Limiting Criteria for the Design of CRCP. Center for Highway Research, The University of Texas at Austin, Austin, Texas
10 Nam, J.H.,(2005) Early-age Behavior of CRCP and Its Implications for Long-Term Performance, Doctoral Dissertation, The University of Texas at Austin, Austin, Texas
11 Nam, J.H., An, D.S., and Kim, Y.B.(2014) Coefficient of Thermal Expansion Measurement of Concrete using Electrical Resistance Strain Gauge, JInternational Journal of Highway Engineering, The Korean Society of Road Engineers. Vol.15 No.6
12 Won, M.C., Hankins, k. and McCullough, B.F, (1991) Mechanistic Analysis of CRCP Considering Material Characteristics, Variability, and Fatigue, Center for Transportation Research, Research Report 1169-2.