Fig. 9
Effective porosity and permeability of pervious concrete as functions of vibration duration. X-axis: vibration duration, t (s); left Y-axis: effective porosity, ne (%); right Y-axis: permeability, k (cm/s). Trend lines are shown only for statistically significant relationships. Linear fits (all mixes): ne versus t — slope = − 0.165% per 1 s (95% CI [− 0.238, − 0.093]), r = − 0.748, p = 0.0001, n = 20; k versus t — slope = − 0.016 cm/s per 1 s (95% CI [− 0.030, − 0.003]), r = − 0.598, p = 0.0186, n = 15.
