Residual Strength of Pervious Concrete under Static and Impact Loading: Fid-Bau Portal

Residual Strength of Pervious Concrete under Static and Impact Loading

Brake, Nicholas A. / Allahdadi, Hamid / Adam, Fatih / Carillo, Nicholas / Mason, Murphy

Pervious concrete is a specialty mix consisting of coarse aggregate and cementing agents used primarily to improve drainage in parking lot applications, roadway shoulders, and low volume roadways. The porosity of the concrete is typically in the range of 10%-35%, which allows for rapid absorption of surface runoff. Although beneficial for this purpose, it is susceptible to raveling and typically has lower peak strength than conventional concrete. However, the residual strength, i.e. total fracture energy, characteristic length, brittleness ratio, and size effect are relatively unknown and have yet to be investigated thoroughly. This information can prove beneficial because it provides insight into the materials resistance to fatigue fracture, and its ductility and energy absorptiveness under impact. In this study, a series of geometrically similar three point bending single edge notch beams of three different sizes were tested under quasi-static loading. In addition, dynamic drop impact tests were carried out on pervious concrete disks to assess energy absorptiveness. The mode I residual behavior was observed to be ductile due to significant crack bridging and tortuosity. In addition, the characteristic length was quite large which precipitated strength domain response and not LEFM (Linear Elastic Fracture Mechanics). The total fracture energy for the largest size beam was approximately 110 N/m and the absorbed energy under impact was approximately 1.4 Joules. In addition, the excellent residual energy absorptive properties of the pervious concrete as shown in this paper, may lead to expanded use of this material for energy absorptive applications like highway median wall barriers upon further enhancement and optimization of the material constituency.