چكيده به لاتين
The pavement should be able to provide a smooth surface that should have sufficient safety to drive vehicles and also have enough resistance to failures.
Asphalt binder is one of the most important factors affecting the performance of asphalt mixtures. Since neat asphalt binder is not able to provide the proper conditions in the mixture to bear today's traffic loads, it is necessary to modify the asphalt binder with some additive.
Polymer additives have shown successful results as modifiers of asphalt binder and asphalt mixes. Their basic function is to improve the physical, chemical, and rheological properties of asphalt binder.
In this study, a combination of two types of cost-effective polymers has been used to improve the properties of binder and to achieve properties similar to that of styrene-butadiene-styrene. Since the two SBR and PP polymers are classified as elastomers and plastomers, respectively,
SBR and PP polymers with ratios of 70/30, 50/50 and 30/70, at 3, 4 and 5 wt% of asphalt binder were used, and the performance of binder and asphalt mixtures containing these polymer blends was compared with that of asphalt mixtures containing 4% and 5% SBS polymer. To increase the stability of polymers in asphalt binder, CLOSITE 15A nanoclay was used at 1.5 wt% of asphalt binder.
In order to evaluate the performance of the binder, the SARA, FTIR, storage stability test, rotational viscosity test, DSR test, LAS test and MSCR test were conducted on the binders samples and performance of asphalts mixtures was investigated using the indirect tensile strength test, resilient modulus test, dynamic creep test, indirect tensile fatigue test and Four-point bending beam fatigue test.
The results of tests performed on binder and asphalt mixture specimens showed that the use of polymer blends improves the performance of binder and asphalt mixtures.
Furthermore, the samples containing 5% polymer blends with 70% of SBR Shows better test results in comparison to a sample containing 5% SBS and showed the best performance among all samples.
