Blockage rules of micro particles through permeable concrete movement

In order to address the problem of pore seepage and plugging in pervious concrete,a pervious concrete plugging test device was used to simulate the flow and distribution of surface micro particles through concrete in the initial stage of rainfall.The pore structure was reconstructed by CT scanning technology and avizo software.The surface micro particles in Kunming were modeled by DEM model in CFD.Particles were simulated by multiphase flow through the process of permeable concrete.The results showed that the CFD numerical simulated results were in good agreement with the experimental results.The surface micro particles with particle size rangeing100～500 μm had a certain degree of blockage to the concrete,and still had a good permeability (higher permeability coefficient).The blockage of particles below 100 μm was more significant,and the permeability coefficient approached to the basic level of zero ;More importantly,it was found that the seepage velocity of 0～50 μm particles passing through concrete was slow and partially adhered to the wall of the tunnel,leading to the decrease of the diameter,which affected the seepage.

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