This study evaluates the applicability of mastic asphalt concrete for backfilling mini-trenches of communication cables. Characterization tests, such as the dynamic modulus, flow-number, Texas overlay, four-point bending beam, and Hamburg wheel tracking tests, were conducted on conventional mastic asphalt concrete and lower-temperature mastic asphalt concrete. A structural analysis of the backfilling of mini-trenches of mastic asphalt concrete was performed and compared with the results of conventional soil backfilling methods using the finite-element method. The performance year was calculated based on the strain behavior and the results of the structural analysis. A life-cycle cost analysis (LCCA) was performed based on net-present-value method. The results of laboratory experiments show that the lower-temperature mastic asphalt concrete performs better than conventional mastic asphalt concrete in terms of resistance to permanent deformation and fatigue cracking. The performance year of the mastic asphalt concrete is three times longer than that of the conventional sand-backfilling mini-trench. The LCCA results indicate that the cost of backfilling by the mastic asphalt concrete is two times lower than that by the conventional sand-backfilling mini-trench.

ABSTRACT
1. 서론
2. 연구현황
    2.1. 국내 연구현황
    2.2. 국외 연구현황
3. 배합설계 및 공시체 제작
    3.1. 배합설계
    3.2. 공시체 제작
4. 아스팔트혼합물 실내 공용성 평가
    4.1. 동탄성계수 시험
    4.2. Flow Number 소성변형 시험
    4.3. 반사균열 시험
    4.4. 4점 반복 굽힘 피로균열 시험
    4.5. 함부르크 휠 소성변형 시험
5. 포장구조해석
    5.1. 포장 구조
    5.2. 재료특성 및 하중
    5.3. 구조해석 모형 설계
    5.4. 구조해석 결과
    5.5. 허용 평균일교통량 및 포장 수명
6. 생애주기비용 분석
    6.1. 건설재료비
    6.2. 생애주기비용 분석
7. 결론
감사의 글
REFERENCES

• 김영민(한국건설기술연구원 연구위원) | Kim Yeong-Min
• 마혜주(국립군산대학교 토목공학과 석사과정) | Ma Hye-Ju
• 박대욱(국립군산대학교 토목공학과 교수) | Park Dae-Wook Corresponding author