Study on photocatalytic and mechanical properties of TiO2 modified pervious concrete

Photocatalytic pervious concrete pavement is a potential and sustainable new method for treating urban air and water pollution, and there is now an increasing amount of research on TiO 2 pervious concrete due to its excellent photocatalytic properties. In this study, pervious concrete with varying nano-TiO 2 contents (0 %, 1 %, 2 %, 5 %, 8 %) was prepared and evaluated for its performance in purifying methyl orange (MO). The results show that as the TiO 2 content increased from 0 % to 8 %, the photocatalytic degradation efficiency increased and then decreased, with the highest MO degradation rate of pervious concrete with 5 % TiO 2 content was 42.8 % at 120 min. However, as the TiO 2 content increases, the compressive strength and TiO 2 utilization rate of pervious concrete gradually decrease, and the 28-day compressive strength decreases from 26.0 MPa to 13.5 MPa. Therefore, 2 % TiO 2 content was determined to be optimal for pervious concrete.