Influence of nanosilica and polypropylene fibers on the permeability, compressive and flexural strength of pervious concrete

The article examines the importance of pervious concrete in construction, emphasizing the need to balance the required permeability with necessary strength. The incorporation of nanosilica and polypropylene fibers into pervious concrete was evaluated, considering compressive and flexural strength, void percentage, and permeability. The methodology included an experimental mix design and specific tests. The results showed significant improvements in the properties of pervious concrete. For instance, compressive strength increased from 128.01 kg/cm² in the standard concrete to 216.08 kg/cm² with the addition of 0.12% polypropylene and 1% nanosilica. Similarly, flexural strength exhibited substantial increases, from 18.76 kg/cm² in the standard to 34.11 kg/cm² and 43.42 kg/cm² with the respective dosages. Regarding permeability, the coefficient decreased from 2.60 cm/s in the standard concrete to 2.50 cm/s with the addition of 0.12% polypropylene and 1% nanosilica. In summary, the research supports the effectiveness of these additives in enhancing the performance of pervious concrete, with improvements of up to 68.8% in compressive strength and 131.4% in flexural strength.