Design of Polyurethane Pervious Concrete and Weather Resistance

Polyurethane pervious concrete has gained significant attention in urban pavement applications due to its rapid construction, wide color range, and improved comfort underfoot. This material offers a promising alternative for sustainable and aesthetically adaptable pavements. Research has focused on optimizing the aggregate-tobinder ratio to balance key properties such as compressive strength, surface porosity, and water permeability. Experimental results indicate that a 30:1 aggregate-to-binder ratio achieves the best compromise, providing approximately 5 MPa compressive strength and 11.45 mm/s permeability. While increasing aggregate content enhances surface porosity, most pores remain isolated, limiting permeability improvement. Thermal aging tests revealed an initial increase in strength due to polymerization, followed by a decline from oxidation. Red specimens exhibited higher resistance to heat degradation compared to green and yellow ones. UV exposure had a less significant effect, but red specimens again demonstrated superior durability. High-humidity conditions severely reduced compressive strength, with a 26% loss after fourteen days, highlighting vulnerability to water vapor. The study is limited to laboratory-scale testing, utilizing only iron oxide pigments, without field validation or evaluation of alternative pigments. Additionally, drainage system design and freeze-thaw performance were not assessed. Future research should focus on enhancing water vapor resistance through modified binder compositions or surface treatments, testing other pigments, evaluating freeze-thaw durability, and validating performance in real-world field conditions. These steps will provide a comprehensive understanding of polyurethane pervious concrete’s durability, functionality, and practical applicability in urban infrastructure projects.