International Journal of Highway Engineering (한국도로학회논문집)

Korean Society of Road Engineers (한국도로학회)
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Characteristics of Crack Spacing and Crack Width of Continuously Reinforced Concrete Pavement Based on Long-Term Field Surveys

장기간 현장조사를 통한 연속철근 콘크리트 포장의 균열간격과 균열폭 특성 분석

  • 오한진 (한국도로공사 도로교통연구원) ;
  • 조영교 (경희대학교 공과대학 사회기반시스템공학과) ;
  • 김성민 (경희대학교 공과대학 사회기반시스템공학과)
  • Received : 2016.03.17
  • Accepted : 2016.06.07
  • Published : 2016.06.15
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Abstract

PURPOSES : The purpose of this study is to investigate characteristics of crack spacing and crack width and their relationship in continuously reinforced concrete pavement (CRCP) based on the data obtained from long-term field observations. METHODS : The crack spacings and crack widths are measured periodically over 10 years at two different CRCP sections: one with asphalt bond breaker beneath concrete slab, and the other with bonded lean concrete base beneath concrete slab. The effects of steel ratio, type of underlying layer, terminal treatment method, and seasonal temperature change on the crack characteristics are evaluated by analyzing the measured data. RESULTS : The CRCP with lean concrete base shows smaller crack spacings than those of the CRCP with asphalt bond breaker. As the steel ratio increases, both the crack spacing and crack width tend to decrease. The crack width becomes larger as the crack age increases, but once the crack age is over a certain value the crack width tends to converge. When the terminal anchor lug system is not used and the expansion joints are employed at the terminals, the crack spacings and crack widths increase near the terminal sections. The crack spacing and crack width seem to be proportional each other, but not necessarily linearly, and their relationship is more distinguished in the summer when the crack widths become smaller. CONCLUSIONS : The steel ratio, underlying layer type, terminal treatment method, and seasonal temperature change affect the characteristics of cracks and the crack spacing and crack width are related to each other.

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References

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