PURPOSES : The purpose of this study was to investigate the long-term trend of internal strain within the continuously reinforced concrete pavement (CRCP) based on measurements. METHODS : The strains of the concrete and reinforcing bars were measured at two induced cracks and one construction joint. The analysis was performed using data accumulated over five years from the concrete placement. The effects of the initial construction conditions were investigated by comparing the strains and stresses at each location.
RESULTS : In the long-term behavior, the highest tensile strains of the concrete and rebar were observed from December to January, and the lowest tensile or the highest compressive strain was observed from July to August. A lower rebar stress was measured in the construction joint, which has a higher steel ratio than that of cracks. As the distance from the crack and joint increased, the rebar strains decreased. Higher tensile strains of the concrete and rebar were measured where a higher concrete setting temperature occurred. A gradual decrease in the maximum concrete tensile strain was observed in the five-year measurements. However, in the case of reinforcing bars, stress reduction with time was not observed in the long-term behavior. CONCLUSIONS : Although a gradual decrease in concrete strain was revealed by long-term measurements, it is predicted that minimizing the concrete setting temperature to reduce the initial tensile strain could effectively increase the fatigue strength of CRCP

ABSTRACT
1. 서론
2. 변형계측 방법
    2.1. 계측구간
    2.2. 게이지 설치방법
3. 시공직후 단기변형
    3.1. 초기에 발생한 콘크리트의 변형
    3.2. 초기에 발생한 철근의 응력
4. 장기변형
    4.1. 콘크리트의 장기 변형거동
    4.2. 철근의 장기 변형거동
5. 결론
REFERENCES

• 유태석(한국도로공사 도로교통연구원 연구위원) | Yoo Tae Seok Corresponding Author