Abstract To fully restore the performance of waste SBS modified asphalt mixture, better realize its recycling and application in high-grade pavement, achieve the concept of sustainable green development of asphalt pavement. In this paper, the synergistic effects of bio-rejuvenator and active isocyanate rejuvenators (including hexamethylene diisocyanate (HDI), diphenyl-methane-diisocyanate (MDI) and toluene-2, 6-diisocyanate (TDI)) on the chemical structure, physical and rheological properties of aged SBS modified bitumen were thoroughly investigated. Fourier infrared spectrum and Gel permeation chromatography analysis indicate the isocyanate groups of active rejuvenators react with hydroxyl or carboxyl group from the degraded SBS segments to form new amide groups that can reconnect the broken segments of aged SBS and partly restore its molecular weight distribution. From physical and rheological properties, bio-rejuvenator can restore the low-temperature properties by rebalancing the colloidal structure of aged binder, meanwhile, active rejuvenators can greatly improve the high-temperature performance of rejuvenated SBS modified bitumen with bio-rejuvenator through reconnecting the broken segments of aged modifier SBS. Furthermore, MDI with benzene ring structure is more conducive to enhancing the high temperature rutting resistance of rejuvenated SBS modified bitumen. While HDI can bring some flexible segments into the restored structure of SBS, which is more beneficial to improve its low-temperature cracking resistance of rejuvenated binder. And the fluorescence images further demonstrate isocyanate rejuvenators can partly restore the crosslinking network structure of aged modifier SBS in rejuvenated SBS modified bitumen. This research would be conductive to promoting the application of rejuvenated SBS modified bitumen into the construction of high standard pavement.
#1Zhilong Cao(WUT: Wuhan University of Technology)H-Index: 7
#2Meizhu Chen(WUT: Wuhan University of Technology)H-Index: 12
Last. Lihui Xue(WUT: Wuhan University of Technology)H-Index: 14
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Abstract Large amount of waste asphalt mixture will be produced in the process of pavement renovation and maintenance, and the waste asphalt mixture recycling can be achieved through rejuvenation. In this paper, four rejuvenators (vacuum stream oil, cashew shell oil, corn oil and waste engine oil) with different chemical composition were selected to rejuvenate aged SBS modified bitumen (ASMB). The influence of different rejuvenators on the rheological properties of rejuvenated aged SBS modified ...
Abstract Recycling agents, or rejuvenators, are products with chemical and physical characteristics designed to restore the rheological properties of aged asphalt binders to improve the performance of recycled asphalt mixtures with large quantities of reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS) that promote economic and environmental benefits. This paper summarizes current knowledge related to the use of recycling agents in the asphalt pavement industry, including proper...
Last. Jun Yang(SEU: Southeast University)H-Index: 118
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Abstract Profound progress has been made in bio-rejuvenators to enhance aged asphalt's low temperature performance and reduce its high temperature viscosity. However, limitation still exists in the knowledge how long service life of rejuvenated asphalt is and whether regeneration is effective since aging behavior of rejuvenated asphalt is neglected. Furthermore, aging evaluation is based on different tests dependent on temperature, which may lead to various results. This study aims to evaluate t...
Last. Gordon Airey(University of Nottingham)H-Index: 42
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Alternative binders not derived from fossil fuels, known as biobinders, are opening new paths for multiple applications in road infrastructure. Biobinders, usually produced from bio-oils obtained f...
Last. Zhenjun Wang(Chang'an University)H-Index: 19
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The aging of bitumen seriously affects the service life of bituminous pavements. At present, there are many related researches on bitumen aging, but most of them focus on aging endured in indoor surroundings and conditions. Therefore, the conclusions obtained cannot reflect the actual aging changes of bitumen in bituminous pavements in service. In order to study the comprehensive aging process and mechanism of bitumen under the influence of service, we studied bridge deck, traffic lane, and ramp...
Last. Chao Peng(MTU: Michigan Technological University)H-Index: 8
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Abstract The objective of this study is to investigate the possibility of using bio-oil derived from waste wood as a rejuvenator to recycle aged asphalt binders. In this study, petroleum asphalt of PG58-28 was selected as the base binder. The bio-oil rejuvenators with concentrations of 10%, 15% and 20% by weight were added into the Pressure Aging Vessel (PAV) aged base binder to prepare the bio-rejuvenated asphalts. Through the chemical compounds analysis of the bio-oil using the Gas Chromatogra...
AbstractThis study examined the effects of softening additives on the moisture susceptibility of recycled bituminous materials using chemical, mechanical, and imaging laboratory investigation metho...
Abundant studies are using Attenuated Total Reflection (ATR) Fourier Transform infrared spectroscopy to quantitatively evaluate the aging extent of Styrene–Butadiene–Styrene (SBS)-modified asphalt (SBSMA). However, most currently employed SBS characteristic indexes merely represent the SBS concentration within SBSMA and may fluctuate during aging because of the poor compatibility between SBS and bitumen. In this study, a new index calculated by dividing polybutadiene infrared peak intensity by p...
Abstract Research on Life Cycle Assessment (LCA) was initially performed to analyze specific products; however, it evolved to assess environmental impacts of more complex systems, such as roads. In this, the construction, use and maintenance stages are usually considered. The results of different studies revealed that all stages have relevant environmental impacts like topsoil loss, change in the use of land, modification of natural drainage and groundwater patterns, landslides, erosion, sedimen...
Abstract This study developed molecular dynamics (MD) models to study the rejuvenator diffusion behavior and its impact on molecular structures and thermodynamic properties of asphalt binder in Reclaimed Asphalt Pavement (RAP). A two layered model was developed to study the inter-diffusion process between rejuvenator and RAP binder. Results show that the inter-diffusion process can be described by Fickian equation. Molecular Dynamics (MD) simulations yield reasonable diffusion coefficient which ...
#1Xiaobin Han(WUT: Wuhan University of Technology)H-Index: 6
#2Jianying Yu(WUT: Wuhan University of Technology)H-Index: 34
Last. Peng He(WUT: Wuhan University of Technology)H-Index: 5
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Abstract null null In order to better restore the properties of aged SBS modified bitumen (ASMB) and promote its sustainable recycling, in this paper, the reactive chain extension rejuvenators (RCERs) were prepared from polyethylene glycol (PEG-400/PEG-1000) and diisocyanate (2,4-toluylene diisocyanate (TDI)/hexamethylene diisocyanate (HDI)) and the effect of RCERs on the rejuvenation of aged SBS was studied. Different rejuvenation systems composed by TDI, HDI, RCERs and aromatic hydrocarbon oil...
Last. Navid Norouzi(IUST: Iran University of Science and Technology)H-Index: 4
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Abstract The mechanical performance properties of asphalt binders and mixtures can be enhanced by utilizing several modifiers, including Crumb Rubber (CR) and gilsonite. The current study evaluated the effects of CR and gilsonite additive on the rheological behavior of gilsonite and CR/gilsonite composite modified binders and Stone Matrix Asphalt (SMA) mixtures. In this research, to modify original binder, gilsonite (0%, 10%, 20%, 30% and 40% by weight of binder), and CR (5%, 10%, 15%, and 20% b...
Last. Ying Li(WUT: Wuhan University of Technology)H-Index: 3
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Abstract The surface free energy and related parameters of asphalt binder affect the wettability of asphalt binder to aggregate and its moisture sensitivity. In this research, the surface free energy and related parameters of SBS modified bitumen (SMB) after aging/rejuvenating were tested and analyzed. And then based on this data, the effect of common rejuvenator cashew shell oil and active isocyanate rejuvenators on the water damage resistance and moisture sensitivity were evaluated and predict...
Last. Ruiyang Wang(WUT: Wuhan University of Technology)H-Index: 7
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To improve the performance of rejuvenated styrene–butadiene–styrene (SBS)-modified bitumen mixture and realize its high-value recycling, active rejuvenators and biorejuvenators were combined to reg...