Flexural Tensile Fracture Behavior of Pervious Concrete under Static Preloading

It is of importance to study the dynamic flexural tensile fracture behavior of pervious pavement concrete under static preloading. In this study, semicircular pervious concrete specimens with pre-cracks were subjected to static bending tests at different preloading levels and then loaded by dynamic bending tests at different loading rates. According to the experimental results, as the loading rate increases under the same preloads, both the total fracture toughness and the dynamic fracture toughness increase. However, when the loading rate remains unchanged, the total fracture toughness increases as static preloading level increases while the dynamic fracture toughness decreases. In addition, the dynamic fracture toughness increase factor is defined as the ratio of dynamic fracture toughness to static fracture toughness. In order to consider the effects of static preloading levels and loading rates on the dynamic fracture toughness of pervious concrete, the dynamic fracture toughness increase factor model was proposed. The fitting results show good agreement with test data.