Rheological and Microstructural Investigation of the Effects of Rejuvenators on Reclaimed Asphalt Pavement Bitumen by DSR and AFM

Dokandari, Peyman Aghazadeh; Topal, Ali; Özdemir, Derya Kaya

doi:10.1007/s40999-021-00605-z

Cited by 23 publications

(6 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The phase angle δ reflects the proportion of the viscous component in the composite modulus [24,25]. A larger δ indicates a higher viscous proportion, and vice versa, a higher elastic proportion.…”

Section: High-temperature Dynamic Shear Rheology Test Resultsmentioning

confidence: 99%

Study on the Effect of Ultraviolet Absorber UV-531 on the Performance of SBS-Modified Asphalt

Liu

et al. 2022

Materials

View full text Add to dashboard Cite

Asphalt pavements at high altitudes are susceptible to aging and disease under prolonged action of UV light. To improve their anti-ultraviolet aging performance, UV-531/SBS-modified asphalts with UV-531 dopings of 0.4%, 0.7%, and 1.0% were prepared by the high-speed shear method, and the effect of UV-531 on the conventional performance of SBS-modified asphalt before aging was studied by needle penetration, softening point and 5 °C ductility tests. The high- and low-temperature rheological properties of UV-531/SBS-modified asphalt before and after aging were also analyzed by high temperature dynamic shear rheology test and low-temperature glass transition temperature test. Finally, the effect of UV-531 on the anti-aging performance of SBS-modified asphalt was evaluated by three methods, including rutting factor ratio, viscosity aging index, and infrared spectroscopy. The results show that with the increase of UV-531 doping, the needle penetration and 5 °C ductility show an increasing trend, but the effect on the softening point is small. The high temperature stability of SBS-modified asphalt is not much affected by the addition of UV-531, and the low-temperature stability is improved, and when 0.7% UV absorber is added, SBS-modified asphalt shows better low-temperature performance. The results of all three evaluation methods show that the addition of UV-531 significantly improved the anti-UV aging performance of SBS-modified asphalt, with the amount of 0.7% providing the asphalt with the best anti-UV aging performance. The results of the study can provide an important reference for improving the anti-ultraviolet aging performance of SBS-modified asphalt.

show abstract

Section: High-temperature Dynamic Shear Rheology Test Resultsmentioning

confidence: 99%

Study on the Effect of Ultraviolet Absorber UV-531 on the Performance of SBS-Modified Asphalt

Liu

et al. 2022

Materials

View full text Add to dashboard Cite

show abstract

“…This study is a continuation of a previous study, where the authors investigated the conventional, rheological, and microstructural properties of the same three rejuvenated aged bitumen (WEO, WVO, and CRA) [31]. The optimum content of each rejuvenator was determined in the previous study by the authors, where the penetration value was selected as the main criteria.…”

Section: Evaluation Of Optimum Rejuvenator Content Per Each Rejuvenatormentioning

confidence: 95%

Feasibility and mixture performance assessment of waste oil based rejuvenators in high-RAP asphalt mixtures

Özdemir

Dokandari

Raufi

et al. 2023

Mater. Res. Express

Self Cite

View full text Add to dashboard Cite

Asphalt pavements are amongst the most recycled materials in the contemporary world depending on the environmental and financial advantages. The introduction of Recycled Asphalt Pavement (RAP) on newly produced asphalt pavement is possible by the utilization of rejuvenating agents, which should contain oily fractions. For this purpose, within the scope of this study, three types of agents with optimum amounts (by weight of bitumen) were utilized 5.4% Waste Engine Oil (WEO), 5.1% Waste Vegetable Oil (WVO), and 6.8% Commercial Rejuvenating Agent (CRA). The highest applicable RAP content in mixtures depends on the rejuvenator type determined by Marshall Mix Design tests (air voids, flow, and stability). Rejuvenation facilitated the use of 50 to 60% of additional RAP material in the mixtures depending on the rejuvenator type. Indirect Tensile Strength (ITS) test results declared that RAP mixtures, when subjected to the rejuvenation process, resulted in relatively less brittleness and enhanced durability properties compared to the unmodified ones. Additionally, cost comparison analyses demonstrated encouraging results as the cost-benefit ratio exceeded up to 55% for mixtures involving high percentages of rejuvenated RAP. As a final analysis, Return on Investment (ROI) values were calculated for each rejuvenator type by the cost of upgrading the facility to handle RAP and the profit of RAP usage. Consequently, ROI was calculated as a return time in months, which unveils an extremely profitable opportunity in the industry.

show abstract

“…It can be explained as the result of wrinkling of very thin surface films [19,20]. In the previous studies, some researchers attributed bee structure to asphaltene [18,21,22,23].…”

Section: Morphological Investigations By Afmmentioning

confidence: 99%

Morphological investigation of SBS modified bitumen by innovative microscopies: AFM and CLSM

Özdemir

2022

Journal of Innovative Transportation

Self Cite

View full text Add to dashboard Cite

Styrene-Butadiene-Styrene (SBS) is one of the most commonly used copolymer in the PMB production. SBS modification results in different material characteristics on the neat bitumen depending on the SBS type and of course the amount of the SBS used in the modification. Within the scope of this study, morphological characterisation of SBS modified samples involving different amount of SBS copolymer (4%, 5% and 6%) were examined by using innovative microscopies as AFM and CLSM. The topographic and phase properties of the PMB samples were obtained by using AFM and the dispersion and interaction of SBS copolymer with the bitumen were interpreted based on the images obtained by CLSM. As a result it was concluded that, the amount of the copolymer used in the modification process directly effects the morphological properties of the final product (PMB).

show abstract

Rheological and Microstructural Investigation of the Effects of Rejuvenators on Reclaimed Asphalt Pavement Bitumen by DSR and AFM

Cited by 23 publications

References 26 publications

Study on the Effect of Ultraviolet Absorber UV-531 on the Performance of SBS-Modified Asphalt

Study on the Effect of Ultraviolet Absorber UV-531 on the Performance of SBS-Modified Asphalt

Feasibility and mixture performance assessment of waste oil based rejuvenators in high-RAP asphalt mixtures

Morphological investigation of SBS modified bitumen by innovative microscopies: AFM and CLSM

Contact Info

Product

Resources

About