Analysis of Pervious Concrete Properties for Mixtures of Different W/C Ratios

Abstract

Objectives: The influences of the different constituent materials of pervious concrete were analyzed through their physical, mechanical and hydraulic properties, aiming to propose acceptable mixtures for application.   Theoretical Reference: The mixes were prepared with the aid of a dosage curve obtained from the literature. For hydraulic behavior, the Forchheimer’s equation was used.   Method: Five mixes were produced, with a uniform particle size range of 4.8 – 6.3 mm, varying their water/cement ratios. Density, porosity, ultrasound, permeameter and compressive strength tests were carried out for all mixes.   Results and conclusion: The hydraulic characterization (d/√k) was satisfactory using non-linear equations. The relationship between total porosity and other properties, such as, compressive strength, ultrasonic pulse velocity and density in the hardened state, remained inversely proportional. The mixtures developed presented characteristics within those expected for practical applications.   Research implications: Despite many studies, methodologies to produce and analyze pervious concrete have not yet been standardized, with Darcy's law being widely used to describe the flow. This research seeks to contribute to the development of these methodologies, in addition to proposing mixtures with acceptable properties for application and non-linear analysis.   Originality and value: Pervious concrete is considered a sustainable alternative for low-traffic paving and allows reducing surface runoff. The study also aims to raise awareness and propagate sustainable systems that can help with urban drainage, reducing the socio-environmental impact caused by floods.