Dynamics of Total Solids Capture in Pervious Concrete Under Low Solids Loading Applications
摘要
Pervious concrete increases the permeability of paved surfaces, effectively mitigating flash flooding in urban catchments by allowing water to infiltrate the ground. However, runoff from urban areas often carries total solids, which can accumulate within the pores of pervious concrete, leading to clogging and reducing its effectiveness over time. Clogging can be assessed based on Event-Mean concentration (EMC), but this method provides limited information on the dynamics of solid retention. Specimens were cast with 2.36–5.0 mm and 5.0–10 mm aggregates (2 specimens each) with an aggregate-to-cement ratio of 4.0, a water-to-cement ratio of 0.3, and no compaction. With total solids of less than 75 μm and 75–150 μm particles, inflow designed under various hydraulic and solid loading configurations. Samples of outflow were taken at different times during an event and tested for turbidity and total solids. Specimens with larger aggregates, which creates larger pores captured solids less effectively, while specimens with smaller aggregates demonstrated better solid retention. Solid capture percentages remained consistent across multiple events, and none of the specimens reached clogging or saturation points.