Investigation of the Effect of SBR on the Performance of Asphalt Mixtures Containing Warm Mix Asphalt Additives

The performance properties of bitumen and asphalt mixtures can be improved by using several modifiers, including: poly phosphoric acid (PPA1), semi-hot asphalt mixture modifiers (WMA2) and styrene butadiene rubber (SBR3). The present study evaluated the effect of PPA and WMA contents on the functional properties of SMA4 mixture. The modified SBR / PPA and SBR / PPA / WMA mixtures were subjected to indirect tensile strength tests (ITS5), dynamic creep, elastic modulus (Mr6), wheel path and four-point beam fatigue (FPB7). Two-factor analysis of variance (ANOVA8) was used to analyze the data. According to the results, the use of SBR and PPA increases the properties of Mr, grooved, ITS, FE and fatigue behavior of the samples. As the percentage of PPA increases, caries and fatigue behavior increase. While reducing Mr and IT’S of modified mixtures. Among hot additives, Sasobit has a better effect on increasing the performance of bitumen and mixtures.