Performance of PET and nano-silica modified stone mastic asphalt mixtures

Stone mastic asphalt (SMA) has become widely used in the field of pavement engineering. Using specific additives SMA is necessary due to climate change and load condition variations. Thus, it essential utilise a modern mixture with high capacity survive traffic loads. The current study aims use combination waste polyethene terephthalate (PET) Nano-silica (NS) as newly developed hybrid additive modification improve rutting fatigue performance. Waste PET NS were blended C320 bitumen binder by using wet-mix process, producing mixtures. was added (2%, 4%, 6% 8% weight binder). engineering properties assessed through Marshall stability, wheel tracking test, indirect tensile strength ratio resilient modulus drain-off tests. results indicated that adding 4–8% plastic improves performance, stiffness modulus, ratio, performance modified mixtures comparison non-modified significant rut depth drain-offs recorded 1.2 mm, 6100 MPa, 96.4%, 0.04%, respectively. Results revealed 6%PET6%NS have superior concerning better resistance. showed increase content increased life highest extent, at up 220,490, for 6PET6NS Based on reflects optimum ideal content. demonstrated inclusion successfully decreased rates, resistance, improved life.