Laboratory Evaluation of the Effect of Polypropylene Fiber and SBR Latex on Improving the Mechanical Properties of Pervious Concrete

Due to the high permeability of pervious concrete, its using as an upper layer in road and airport pavement could help to guide heavy rainfall, surface water management and its collection. Studies show that despite this important advantage, due to the lower mechanical properties of this type of concrete compared to conventional, its using is not widespread. In order to improve the mechanical properties of pervious concrete, in this study, the effect of adding polypropylene fiber and SBR latex separately and simultaneously on the porosity, permeability, compressive, flexural, and tensile strength of pervious concrete has been evaluated.The results of this study show that by increasing the amount of SBR latex and polypropylene fibers each individually, the mechanical properties of pervious concrete are improved in the composition of control sample, but the percentage of porosity is reduced.The reduction is much greater for the addition of polypropylene fibers than for the addition of SBR latex.With the simultaneous addition of SBR latex and polypropylene fibers, the mechanical properties of pervious concrete are further improved, but the percentage of porosity is also reduced.By controlling the amount of polypropylene fibers used in terms of the necessary restrictions to comply with a minimum of 15% porosity, the optimal combination of latex SBR and polypropylene fibers can be achieved. In this research, this optimal combination has been obtained by adding 35 kg of SBR latex and 0.7 kg of polypropylene fibers, in which the percentage of concrete porosity with 24% reduction compared to the control sample is 15.65%.Compressive strength values increased by 37% (27.6 MPa),tensile strength increased by 36% (3.61 MPa), flexural strength increased by 41% (4.51 MPa) and fracture toughness increased by 24% (MPa.m0.5537). 0) has shown a significant improvement in the mechanical properties of pervious concrete by applying this optimal combination in the present study