PURPOSES: This study was conducted to investigate the causes of damage and to suggest proper repair methods for the sections in which a number of transverse cracks and faulting occurred in JCP (Jointed Concrete Pavement) slabs during the early-age performance period.
METHODS: Field crack survey, FWD (Falling Weight Deflectometer) investigation, dowel bar installation condition survey, longitudinal profile survey, and in-situ core specimen inspection were conducted. .
RESULTS : As a result of the analysis, it was found that there was no decline in the composite modulus of the subgrade reaction (k-value). The dowel bars were properly installed, but the LTE (Load Transfer Efficiency) of the joint and transverse cracks were analyzed to be very low. In addition, it was found that there are voids in the bottom of the slab at the joints and corners. Due to the excessive built-in curling in the early age of concrete pavement construction, upward curling displacement occurred at the joints and corners, resulting in voids at the bottom of the slab. As a result, it was found that transverse cracks occurred due to the defective joint LTE.
CONCLUSIONS: Excessive built-in curling can cause early age cracks in the JCP slabs. In order to minimize the occurrence of reflection cracks after the application of the asphalt overlay in the future, concepts of alternative repair methods were proposed.

ABSTRACT
 1. 서론
 2. 현장 육안조사
 3. 포장구조진단기(FWD) 조사
  3.1. 조사 개요
  3.2. 하중전달율(LTE) 분석
  3.3. 동적지지력 분석
  3.4. 슬래브 하부 간극(void) 분석
 4. 다웰바 상태 조사
 5. 종방향 프로파일 조사
 6. 파손 원인분석 및 보수방안 제안
  6.1. 파손 원인분석
  6.2. 보수방안 개념 제안
 7. 결론
 REFERENCES

• 오한진(한국도로공사 도로교통연구원) | Oh Han Jin
• 박준영(한국도로공사 도로교통연구원) | Park Jun Young 교신저자
• 문기훈(한국도로공사 도로교통연구원) | Moon Ki Hoon
• 김형배(한국도로공사 도로교통연구원) | Kim Hyung Bae
• 정혜민(한국도로공사 도로교통연구원) | Jeong Hye Min