Abstract
Despite the number of environmental advantages that porous concrete (PC) pavements can provide, they are mainly used in light-traffic roads, parking lots and sidewalks due to their low mechanical strength. This research focuses on the common additives employed in PC pavements, according to a literature review, with the aim of increasing their mechanical strength while maintaining an acceptable infiltration capacity. The results demonstrated that the combination of superplasticizers and air-entraining additives can provide indirect tensile strength values over 2.50 MPa, with an infiltration capacity over 0.40 cm/s. In addition, polypropylene fibers were seen to provide very good safety properties, preserving some structural integrity in the case of failure. All mixtures studied obtained outstanding skid resistance results under both dry and wet conditions.
Highlights
Porous concrete (PC) mixtures have been shown to be one of the best solutions to mitigating the problem of climate change
Permeability results were very good for all mixtures, where almost every additive tended to improve it, in comparison with the Control mixture
A similar behavior was observed with microsilica, where the material increases the density (ρ) of the mixture as it replaces some cement
Summary
Porous concrete (PC) mixtures have been shown to be one of the best solutions to mitigating the problem of climate change. The porous structure in this kind of mixture is formed basically of coarse aggregates (CA) with sizes normally in the range of 4–12 mm, with low or no fine content, in order to ensure a pore structure with high infiltration capacity that allows rainwater infiltration. This open structure reduces the strength of PC mixtures that can reach mechanical strengths which are about 60% lower than common concrete pavements [2,11,12]
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