Linking pore system characteristics to the compressive behavior of pervious concrete

Research has been carried out linking matrix strength, total porosity, aggregate size and mean pore size of pervious concrete to its compressive strength. While matrix strength, total porosity and aggregate size are easy accessible parameters, mean pore size is derived from the pore size distribution determined using linear path function. The linear path function is tailored for pervious concrete and validated by an image analysis method. Additionally, based on the statistically extracted pore size distribution the pore size distribution density is calculated and incorporated in a semi-empirical model to predict the compressive stress versus strain behavior of pervious concrete.In this research 27 different pervious concrete series are investigated, varying in their matrix strength (from 29 MPa to 174 MPa), their aggregate to binder ratio (from 2.5 to 3.5) and their aggregate size (from 1.19 mm to 4.75 mm). Based on the coefficient of determination a good correlation between experimental and predicted compressive behavior of the pervious concrete series is achieved.