Distribution of Elliptical Aggregates in Concrete with Wall Effect

The distribution of elliptical aggregates in concrete with wall effect is investigated by computer simulation.The simulation results show that,as the number of simulations increases,the aggregate distribution density at any point in concrete approaches to a fixed value for a given aggregate area fraction.After the validity of the proposed simulation method is verified with experimental results,the effects of the aggregate gradation,aspect ratio,minimum aggregate diameter,and maximum aggregate diameter on the boundary layer thickness are discussed.Based on the numerical results,it is found that the boundary layer thickness increases with an increase in aspect ratio,minimum aggregate diameter,and maximum aggregate diameter.It is also found that the aggregate gradation has a significant influence on the boundary layer thickness.