Laboratory mix preparation and investigation of mechanical behaviour of polyurethane-bound porous rubber pavement

Abstract

With the rise in stormwater runoffs, permeable pavement like polyurethane-bound porous rubber pavement (PRP) offers a viable solution for urban stormwater management. Composed of stone and recycled crumb rubber aggregates bound by polyurethane, PRP features high air voids. This study explores PRP’s mechanical behaviour and freeze–thaw durability in cold climates, essential for sustainable urban infrastructure. We developed methods for sample preparation and air void assessment in PRP and conducted tests on compressive and indirect tensile strength, plus moisture-induced damage. Two scenarios were investigated: one examined four new mixes of varied compositions, and the other focused on mixes with different binders (aliphatic and aromatic). Our investigation reveals insights into PRP’s mechanical behaviour under colder climate conditions. The study shows that higher proportions of stone aggregates and binders enhance mechanical strength, while increased rubber content improves freeze–thaw durability. Furthermore, we found that different binders affect strength variations. The study concludes PRP is effective for low-traffic pavements in colder, freeze–thaw regions.