Numerical Simulation of Pervious Concrete Using Discrete Element Modeling Technique

The objective of this study was to develop a computational model to simulate the behavior of pervious concrete (PC) material. A virtual discrete model will help in understanding the micro- and macro-mechanical behavior of PC, which is otherwise difficult to determine. A particle flow continuum model was used to develop the discrete model for different pervious PC mixtures consisting of different sizes and proportions of coarse aggregates. The displacement versus force and stress versus strain relationships of PC specimens with different aggregate sizes, aggregate-cement ratios, and water-cement ratios were produced from the numerical models. The vertical porosity distribution of laboratory samples was investigated using image analysis techniques. The results from the image analyses were utilized in modeling exercise through Particle Flow Code 2-Dimensional (PFC2D). The PFC2D model predictions also matched well with the results of mechanical tests with very high coefficient of determination. This research demonstrated the great potential of discrete element method to analyze the performance of PC mixtures with varying gradations and properties. It is envisaged that this study will further the state-of-the-art analytical research in the area of PC by the principles of discrete element model methods and image analyses techniques.