Investigation on polymer–rubber aggregate modified porous concrete

Developing pavement materials by using rubber aggregate is an effective approach to massively utilize waste tires. In this paper, a polymer–rubber aggregate modified porous concrete was prepared as pavement friction course material, its properties e.g. strengths, stress–strain, abrasion resistance, impact resistance and its microstructure were studied. The results indicate that the polymer–rubber aggregate modified porous concrete with the optimum replacing ratio of rubber aggregate to mineral aggregate has higher flexural strength and compressive strength than the ordinary polymer modified porous concrete with mineral aggregate; the energy absorption capacity of polymer modified porous concrete is enhanced by rubber aggregates, so the ductility, abrasion resistance, impact resistance of polymer modified porous concrete are improved remarkably by rubber aggregates; their porosity and the permeability can meet the standard of OGFC (Open-Graded Fraction Course). From the SEM observation, the interfacial transition zone between the rubber and cement paste is enhanced by the polymer, the interleaving of polymer film in the cement hydration products and the replacement of rubber particle increases its ductility and flexibility.