PURPOSES : The purpose of this study was to suggest a quantitative trend of the daily and seasonal cyclic movement of transverse crackwidth based on measurements in CRCP(Continuously Reinforced Concrete Pavement) within the first year of construction.
METHODS : Crack gauges were installed in eight normal cracks, two induced cracks, and two construction joints of newly constructed CRCP. Crack width movements were continuously collected for about a year to investigate the cyclic behavior after construction. The daily and seasonal crack width movements were quantitatively analyzed and compared.
RESULTS: Crack width movement in hot weather was relatively less than in cold weather. As a result of frequency analysis of the daily cyclic behavior, it was revealed by measurement that the minimum crack width from 2 p.m. to 4 p.m. was caused by expansion of the concrete; and that the maximum width from 6 a.m. to 8 a.m. was caused by contraction. Average crack width movements were calculated for every month and showed seasonal cyclic behavior. Maximum crack width was measured from December to January. Average crack width was investigated from March to April. Daily crack width movement in relation to concrete temperature was calculated from -0.00017 to -0.03844 mm/℃ and showed gradual decrease in absolute value with time caused by change in the crack spacing. It was found that the relationships between the monthly average crack width and concrete temperature are from -0.004 to -0.012 mm/℃.
CONCLUSIONS : Crack-width movement shows a daily and seasonal cyclic behavior. Crack-width measurement in any time or season will have variance caused by daily and seasonal cyclic movement. Variances and trends were obtained in this study based on measurements for various cracks. The long-term behavior of cracks should be surveyed and compared with these measurements to investigate trends of convergence with time, caused by convergence of crack spacing.

ABSTRACT
 1. 서론
 2. 균열계측 방법
  2.1. 계측구간
  2.2. 균열 게이지 설치방법
 3. 불연속 지점의 일간 순환거동
  3.1. 불연속 지점의 분류 및 정의
  3.2. 일간 순환거동 평균 값 발생빈도 분석
 4. 불연속 지점의 연간 순환거동
 5. 결론
 REFERENCES

• 유태석(한국도로공사 도로교통연구원) | Yoo Tae Seok (Korea Expressway Corporation Research Institute) 교신저자
• 조철민(한국도로공사 도로교통연구원) | Cho Chul Min (Korea Expressway Corporation Research Institute)