Investigation on recycling of SBS modified asphalt binders containing fresh asphalt and rejuvenating agents

Cong, Peiliang; Luo, Wei; Xu, Peijun; Zhao, Henan

doi:10.1016/j.conbuildmat.2015.05.041

Cited by 89 publications

(29 citation statements)

References 28 publications

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“…Besides the aged properties of SBS copolymer and SBS-modified asphalt, their rejuvenated measures and mechanism also raise some concerns. Cong [18] blended rejuvenator, fresh and reclaimed SBS asphalt binder to investigate the regeneration effects. Zhang [19] proposed that 9 wt % dosage of rejuvenator could obtain a similar physical property with original SBS-modified asphalt.…”

Section: Introductionmentioning

confidence: 99%

Aging Mechanism and Rejuvenating Possibility of SBS Copolymers in Asphalt Binders

Wang

Zhang

et al. 2020

Polymers

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The styrene–butadiene–styrene (SBS)-modified asphalt pavement has been in growing demand in the road construction field owing to its workable mechanical property and temperature durability. This paper prepared a penetrative rejuvenator (PR) with waste cooking oil (WCO) and emulsified asphalt, then applied PR on SBS copolymers to investigate its aging and rejuvenating effects in an asphalt binder. After a thin film oven test (TFOT) and ultraviolet (UV) aging of SBS copolymers, Fourier transform infrared (FTIR) spectra were used to analyse the aged copolymers’ chemical structure. Moreover, both aged and rejuvenated SBS copolymers were added into a fresh asphalt binder to get two kinds of modified asphalt binders, namely, MAAC (modified by aged copolymer) and MARC (modified by rejuvenated copolymer). Aiming to analyse the monomer effect of SBS copolymers in the asphalt binder, the rheological characteristic with dynamic shear rheometer (DSR), chemical structure with FTIR and physical properties with penetration, soft point and ductility tests were investigated using MAAC and MAAC samples. The results showed that rejuvenated SBS copolymer could improve MAAC’s viscoelasticity, but from FTIR spectral analysis, PR resulted in no chemical changes to SBS copolymers. A tough coat which made MAAC of higher stiffness was observed on the copolymer surface after thermal treatment. UV caused evidently negative effects on SBS copolymer because of accelerating oxidation by ozone, which brought about high possibility of cracks during servicing periods of asphalt pavement. In addition, MAAC was inferior in both rheological and physical properties, which reflected the significance and necessity in consideration of alleviating SBS copolymer aging in field.

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Section: Introductionmentioning

confidence: 99%

Aging Mechanism and Rejuvenating Possibility of SBS Copolymers in Asphalt Binders

Wang

Zhang

et al. 2020

Polymers

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“…In addition, the temperature viscosity curve of asphalt can be obtained by the formula [21][22][23]. The temperature-viscosity characteristics have some impacts on the pumping performance [24]. As for sealing grease, a low temperature leads to high viscosity, and even pumping difficulties.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on Mechanical Properties of Sealing Grease Composed of Different Base Oils for Shield Tunnel

Yang

2020

Materials

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This study proposes a novel sealing grease with improved mechanical properties and environmental performance. A series of sealing grease samples were made with different base oils, including mineral oil and renewable oil (vegetable oil and lard). In this study, thermogravimetric analysis (TGA) was conducted to study the adsorption capacity of the thickener to the base oil. The fluidity of the sealing grease was also tested at different temperatures. Furthermore, an exponential function was proposed for the flow rate of the sealing grease and the temperature. Moreover, a cone penetration test was conducted to study the consistency of the sealing grease. The results indicated that the capacity of the thickener to adsorb vegetable oil was greater than that of mineral oil, but less than that of lard. Additionally, the flow rate of the sealing grease increased with an increase in temperature. At a fixed temperature, the flow rate of the sealing grease increased with the base oil content. According to the exponential function, the composition of the base oil is the key factor that determines the temperature sensitivity of the sealing grease. In addition, the sealing grease made of vegetable oil has the minimum temperature sensitivity coefficient.

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“…erefore, the recycling of SBS-modified asphalt inevitably includes the recycling of the SBS copolymer. To this end, recycling agents developed by researchers have different application scopes, and it is unknown whether they can be used for SBS-modified asphalt recycling [19][20][21][22][23]. In view that SBS-modified asphalt is adopted for surface and middle courses of most high-grade highways in China, it is of great practical significance to find a recycling agent applicable to SBS-modified asphalt.…”

Section: Introductionmentioning

confidence: 99%

Effect of Recycling Agents on Rheological and Micromechanical Properties of SBS‐Modified Asphalt Binders

Guo

Tan

Luo

et al. 2018

Advances in Materials Science and Engineering

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Individual effect of aging and rejuvenator recycling on basic properties of asphalt is readily recognized, but there is only limited understanding about whether the recycling of SBS- (styrene-butadiene-styrene-) modified asphalt is an inverse process of aging or not. To compare the effects of aging and rejuvenator on microproperties and molecular composition of SBS-modified asphalt, comprehensive performance tests and physical-chemistry experiments were conducted. The results of infrared spectroscopy tests demonstrate that the reticular crosslinking structure of asphalt was destroyed and SBS’s modification effect was gradually lost after aging. This can cause the strengthening of high-temperature performance and reduction of the low-temperature anticrack property of SBS-modified asphalt. Scanning electron microscope shows that the island structure of SBS-modified asphalt disappeared after aging. Energy spectrum analysis shows that the C (carbon) content of aged SBS-modified asphalt has decreased, while the O (oxygen) content and S (sulfur) content have increased obviously. Results of the fluorescence microscope, SEM, and rheological tests show that the epoxy functional group compounds of aliphatic glycidyl ether resin had high reactivity; the triblock molecular structure of SBS and the mechanical performance of SBS-modified asphalt were recovered.

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Investigation on recycling of SBS modified asphalt binders containing fresh asphalt and rejuvenating agents

Cited by 89 publications

References 28 publications

Aging Mechanism and Rejuvenating Possibility of SBS Copolymers in Asphalt Binders

Aging Mechanism and Rejuvenating Possibility of SBS Copolymers in Asphalt Binders

Comparative Study on Mechanical Properties of Sealing Grease Composed of Different Base Oils for Shield Tunnel

Effect of Recycling Agents on Rheological and Micromechanical Properties of SBS‐Modified Asphalt Binders

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