PURPOSES : The logistic roads for freight transport along to the new port of Busan have been suffered by the rapid weather changes including high temperature and torrential rain. As a result, the roads require annual repair, which have been distressed seriously by the heavy logistic and environmental loads. Therefore, we need to identify the cause of the road pavement distresses and find a proper design method to minimize the pavement distress in order to prohibit the problem aggravated.
METHODS : The damaged conditions of the logistic roads were investigated on-site. In addition, applied pavement designs, real traffic volumes, and historical climatic information were intensively collected for this project. With the investigated and collected data Korean pavement design program (KPRP) was implemented to analyzed the causes of the damaged roads and conceive the pavement design draft optimized for the roads.
RESULTS : According to the investigation and KPRP analysis, the traffic volume to transport freights impacts significantly the pavement distress, so that a higher PG grade binder type should be used, for which polymer modified asphalt (PMA) binders are recommended. Moreover, its pavement thickness should be increased to secure load bearing capacity, but thickening the pavement has been discouraged due to difficulties induced by the road-sectional change, especially road-height change.
CONCLUSIONS : In conclusion, 5cm PMA overlay is suggested for the normal-scale maintenance, and 7cm PMA overlay for large-scale maintenance. Besides these, the application of Polymer-modified Stone Matrix Asphalt (PSMA) using PG76-22 binder would be the best preventive maintenance method, which has been well know as having higher fatigue resistant performance than general PMA. However, if we use PSMA, quality control should be very cautious since PSMA can be very susceptible premature distress if its production and construction are improperly proceeded.

ABSTRACT
1. 서론
    1.1. 연구의 배경
    1.2. 연구의 목적
2. 임항도로 현황 조사 분석
    2.1. 파손현황 조사 분석
    2.2. 단면설계 현황 분석
    2.3. 교통량자료 수집 및 분석
    2.4. 기후자료 수집 및 분석
3. 임항도로 파손 원인 분석
    3.1. 한국형포장설계프로그램(KPRP) 적용
    3.2. 교통량 산정
    3.3. 기존 설계단면 적정성 평가
    3.4. 인근 국도교통량 비교 평가
4. 임항도로 최적 설계 단면 제안
    4.1. 단면두께 증가에 따른 적정 단면 제시
    4.2. 단면두께를 유지할 경우 적정 단면 제시
5. 결론
REFERENCES

• 김영민(한국건설기술연구원 도로교통연구본부) | Kim Yeong Min
• 안진홍(경희대학교 사회기반시스템공학과) | An Jin Hong
• 신휘재(인덕대학교 건설안전공학과) | Shin Hwi Jae
• 송정훈(인덕대학교 건설안전공학과) | Song Jeong Hoon
• 황성도(한국건설기술연구원 도로교통연구본부) | Hwang Sung Do (Department of Highway&Transportation Reseach, Korea Institute of Civil Engnieering and Building Technology) 교신저자