جستجوی مقالات مرتبط با کلیدواژه "مخلوط" در نشریات گروه "عمران"

Recycled asphalt pavement (RAP) has become a common practice in most countries. Hence, the use of rejuvenators along with RAP has become popular with asphalt producers, mainly due to rising raw material costs. In this study, crumb rubber (CR) 2 and waste frying oil (WFO) 3 were used to restore the properties and increase the rutting resistance of RAP. Several physical and rheological properties of bitumen were tested. The results showed that the RAP bitumen samples containing WFO and CR reduce the softening point and increase the degree of penetration. This is related to increasing penetration index. In addition, the viscosity of WFO/CR composite recycled bitumen showed better workability and hardness, as well as low storage stability temperature (less than 2.2 °C) with an acceptable decrease during heating. The rheological properties of WFO/CR with regenerated bitumen were comparable to the control sample. The incorporation of CR with WFO as a hybrid rejuvenator increased the rutting resistance. Therefore, the presence of WFO/CR has a significant effect on the properties of RAP bitumen, while creating a better environment and reducing environmental pollution by reusing waste materials.

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.