Abstract: Photocatalytic pervious concrete pavement offers a novel solution for purifying urban runoff pollution. With methyl orange solution as pollution indicator, the impact of water-binder ratio and aggregate-binder ratio on the porosity, mechanical properties, and water purification performance of photocatalytic pervious concrete modified with TiO₂ was investigated. Results demonstrate that larger water-binder ratio leads to increases in compressive strength and flexural strength while decreases in porosity and purification performance. Conversely, larger aggregate-binder ratio results in reduced compressive strength and flexural strength while increased porosity and purification performance. The optimal comprehensive performance of pervious concrete can be achieved at a water-binder ratio of 0.25 and an aggregate-binder ratio 4.0. Additionally, porosity is the primary factor impacting the mechanical properties and water purification performance of pervious concrete. Porosity exhibits a negative correlation with mechanical properties and a positive correlation with water purification performance. This study provides valuable insights for designing the mix proportion of photocatalytic pervious concrete.

Key words: pervious concrete, photocatalytic, mix proportion, mechanical properties, water purification performance