Water Resources and Power

To investigate the influence of rolling load type,grain size distribution and particle shape on the compaction performance of roller compacted concrete(RCC),by analyzing the contact stress field and velocity field of particles,the RCC particles' moving law,compacted mechanism and compaction properties under compacting loads were visually researched from the micro perspective.Based on the particle flow code(PFC3D),the whole compacted process of RCC was numerically simulated by using the discrete element method(DEM).The results show that the fine particles continuously move to the coarse particles once the compacting loads are applied.Compared with static loads,vibrating compaction stage has more significant impact on RCC's porosity.Changing the grain size distribution with relatively low porosity,medium particles can heavily influence the compaction quality of RCC.When compared to the flat and slender particles,aggregate of spherical particles can be compacted more easily.