PURPOSES : The evaluation of the low-temperature performance of an asphalt mixture is crucial for mitigating transverse thermal cracking and preventing traffic accidents on expressways. Engineers in pavement agencies must identify and verify the pavement sections that require urgent management. In early 2000, the research division of the Korea Expressway Corporation developed a three-dimensional (3D) pavement condition monitoring profiler vehicle (3DPM) and an advanced infographic (AIG) highway pavement management system computer program. Owing to these efforts, the management of the entire expressway network has become more precise, effective, and efficient. However, current 3DPM and AIG technologies focus only on the pavement surface and not on the entire pavement layer. Over the years, along with monitoring, further strengthening and verification of the feasibility of current 3DPM and AIG technologies by performing extensive mechanical tests and data analyses have been recommended. METHODS : First, the pavement section that required urgent care was selected using the 3DPM and AIG approaches. Second, asphalt mixture cores were acquired from the specified section, and a low-temperature fracture test, semi- circular bending (SCB) test, was performed. The mechanical parameters, energy-release rate, and fracture toughness were computed and compared. RESULTS : As expected, the asphalt mixture cores acquired from the specified pavement section ( poor condition – bad section) exhibited negative fracture performances compared to the control section (good section). CONCLUSIONS : The current 3DPM and AIG approaches in KEC can successfully evaluate and analyze selected pavement conditions. However, more extensive experimental studies and mathematical analyses are required to further strengthen and upgrade current pavement analysis approaches.

1. Introductuon
2. Research objective
3. Specified pavement section selectionprocess
4. Asphalt mixture coring and fracture experimentalwork
5. Theoretical background: Semi Circular Bending(SCB) fracture test
6. Data analysis and comparison
7. Summary and conclusion
ACKNOWLEDGMENTS

• Young Oh Jho(Member · General manager · Road Korea, Dep. of Pavement Management System) | 조영오
• Augusto Cannone Falchetto(Member · Assistant professor (Ph.D.) · Aalto University, Department of Civil Engineering)
• Ki Hoon Moon(Member · Principal Researcher · Korea Expressway Corporation Pavement Research Division) | 문기훈 Corresponding author
• Dueck Su Sohn(Member · Principal Researcher · Korea Expressway Corporation Pavement Research Division) | 손덕수