PURPOSES : The feasibilities of cohesive elastoplastic contact model and discrete element method (DEM) for asphalt concrete mixture compaction process were evaluated.
METHODS : The contact models that were used to simulate the dynamic behavior of construction materials were reviewed. The characteristics of cohesive elastoplastic models were discussed from the perspective of integration with existing contact models. Two asphalt mixtures that were fabricated with specific aggregate gradations and binder contents were compacted according to the Superpave gyratory compaction specification. The parameters for the model were determined via trial-and-error method. The heights of the specimens were plotted with respect to number of gyrations. The results of the laboratory tests were compared to those of numerical simulations. The displacement of particles in asphalt mixture specimen was also visualized to understand the effect of gyratory compaction on asphalt mixture specimen.
RESULTS : The DEM model exhibited a significant friction coefficient dependency on compaction degree and slop. The DEM model with parameters determined through trial and error demonstrated reasonable simulation results in terms of specimen height at a gyration number. CONCLUSIONS: Even though a little discrepancy was observed between the results of the experimental test and numerical simulation, a combination of DEM with cohesive elastoplastic contact model seems to be applicable for the simulation of asphalt mixture compaction in laboratory. However, the model needs to be enhanced to be used for more realistic compaction processes, including heat transfer, phase change, and vibratory loading.

ABSTRACT
1. 연구배경 및 목적
2. 문헌고찰
    2.1. 건설재료의 유동 모사를 위한 접촉 모형
    2.2. 아스팔트 콘크리트의 다짐 모사 기법
3. 접착성 점탄소성 모형을 활용한 다짐 모사
    3.1. 다짐 실험 조건
    3.2. 수치해석 기본 가정 및 조건
    3.3. 해석 결과
4. 결론 및 고찰
REFERENCES

• 윤태영(한국건설기술연구원) | Yun Taeyoung 교신저자