چكيده به لاتين
Rutting is one of the common type of damage that occurs in flexible pavements .in recent years width increasing and intensity of permanent deformation has caused concern about the effect of this kind of damage on Asphalt pavements. Temperature and axial load are two of the factors that have an extreme effect on this phenomenon. Asphalt mixtures with stone matrix are known as a durable and resistant layer against rutting. High consumption of Bitumen in this mixtures, has made the usage of additives inevitable in order to modify Bitumen properties and preventing draindrown phenomena. In this research the effect of both, temperature and stress level on asphalt rutting potential SMA, modified by SBS and EVA polymers with Resilient Modulus experiments and dynamic creep has been studied.
Also in controlled samples, locosel FG300 cellulose fibers are used in order to prevent draindown phenomenon. Dynamic creep test is done in three temperature laevel 40,50,60 oC and three stress levels 250,350,450 Kpa on the samples. Resilient module experiment demonstrated that adding SBS and EVA polymers causes an increase in resilient module from 2100 of the controlled samples to 4000 Mpa 4700 Mpa for the samples which contains, with order, EVA and SBS. The result of dynamic creep test shows that by temperature and stress level increasing, rutting potential increases too, but this increscent rate in the modified samples by polymer is very lower than controlled samples. rutting performance of EVA containing mixture on 40 oc temperature is equal or even better than SBS polymer but with temperature increasing the operation of SBS polymer against rutting was better
