A review of the pore structure of pervious concrete: Analyzing method, characterization parameters and the effect on performance

Pervious concrete is a paving material with variety of environmental benefits, which has been widely used in sponge city. The rich connected pore structure is the key characteristic of pervious concrete different from dense concrete. Simultaneously, the pore structure plays a dominant role in the macroscopic properties. The pore structure analysis methods of pervious concrete were summarized in this paper. Then, the parameters and acquisition methods for characterizing pore structure were introduced, and the relationship between different parameters was analyzed. The influencing factors of pore structure were discussed. Again, the effects of pore structure on macroscopic properties were reviewed, including water permeability, mechanical properties, fatigue durability, noise reduction and clogging. The prediction models of water permeability and mechanical properties considering pore structure parameters were summarized. Finally, the future research direction was prospected, which called for performance prediction model incorporating more pore structure features, and pore structure optimization method for good balance between water permeability and mechanical properties to promote the application of pervious concrete to more scenarios.