Comparing effects of physisorption and chemisorption of bio-oil onto rubber particles in asphalt

Zhou, Tao; Kabir, Sk Faisal; Cao, Liping; Hai, Liu; Zhang, Dong; Fini, Elham H.

doi:10.1016/j.jclepro.2020.123112

Cited by 66 publications

(31 citation statements)

References 45 publications

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“…From Figure 4 c, it can be found that the LBP activated reclaimed rubber powder was not agglomerated, and the rubber particles were evenly dispersed in the asphalt. The main reason was that LBP weakened the interaction between the molecular chains of the reclaimed rubber powder, swelling the dense sulfur bridge structure and softening the reclaimed rubber powder sufficiently, so that the reclaimed rubber powder was evenly dispersed in the asphalt [ 23 ]. Therefore, fluorescence microscopy analysis further proved that the activation of LBP improved the storage stability and compatibility of the modified asphalt.…”

Section: Resultsmentioning

confidence: 99%

“…This phenomenon can be attributed to the fact that the LBP containing active aromatic components not only sufficiently swelled the reclaimed rubber powder, but also made the density of the LBP activated reclaimed rubber powder closer to the density of the base asphalt. As a result, the storage stability of LBP activated reclaimed rubber powder modified asphalt was improved [ 23 , 25 , 28 ].…”

Section: Resultsmentioning

confidence: 99%

“…However, the application of universal waste rubber with an integral three-dimensional network structure to modified asphalt not only increased the viscosity of modified asphalt, but also caused the separation of the rubber phase from the asphalt phase [ 17 , 18 , 19 , 20 ]. Surprisingly, reclaimed rubber powder, prepared by destroying the molecular cross-linking structure of ordinary rubber powder, modified asphalt, which effectively solved the problems of high viscosity, inferior compatibility and difficult construction of universal rubber powder modified asphalt [ 21 , 22 , 23 , 24 ]. The reason for this was that under the action of high temperature and high shear force, the surface of reclaimed rubber powder produces some active groups, which is conducive to the chemical bonding with asphalt, improving the storage stability of the modified asphalt [ 25 , 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

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Study on Storage Stability of Activated Reclaimed Rubber Powder Modified Asphalt

Kong

Yang

et al. 2021

Materials

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The purpose of this research was to make full use of waste lubricating by-products (LBP) and reclaimed rubber powder (RR) to modify asphalt by a one-pot approach, so as to achieve the dual purpose of solving the poor storage stability of reclaimed rubber powder modified asphalt (RRMA) and the realization of solid waste recycling. A variety of characterization techniques were performed to analyze storage stability, conventional properties and microstructure of LBP-activated reclaimed rubber powder modified asphalt (Blend). Fourier transform infrared spectroscopy illustrated that not only the chemical composition of LBP was very similar to that of asphalt, but also the activation of LBP improved the compatibility of RR with asphalt and enhanced the storage stability of Blend. Fluorescence spectrum and scanning electron microscopy results indicated that the RR without LBP activation was aggregated and dispersed as blocks in asphalt, while the LBP activated RR was uniformly dispersed in the asphalt phase. The segregation test demonstrated that Blend exhibited outstanding storage stability, in which the softening point difference was within 2.5 °C and the segregation rate was −0.2–0.2. In addition, the conventional properties of Blend have been significantly improved, especially in penetration and ductility. More importantly, the short-term aging results demonstrated that, compared with RRMA, Blend possessed excellent anti-aging performance.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study on Storage Stability of Activated Reclaimed Rubber Powder Modified Asphalt

Kong

Yang

et al. 2021

Materials

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“…The performance of neat asphalt cannot be improved at all by adsorbing light components. Therefore, the dry method improves the asphalt mixture’s performance, meaning that it cannot be regarded as modified asphalt in a real sense [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

“…At present, traditional rubberized asphalt has the following shortcomings during use: it is easily degraded at high temperatures and cannot be stored for a long time [ 18 , 19 ]. Rubberized asphalt produced on-site is time limited; after a certain point, its performance will be significantly reduced—e.g., in a low construction environment [ 8 , 13 ]. Most of the manufacturing process of asphalt rubber is on-site production, and a sufficient working surface must be added at the construction site to complete the production of asphalt rubber [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Laboratory Investigation of Rubberized Asphalt Using High-Content Rubber Powder

Wang

et al. 2020

Materials

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Rubberized asphalt (RA) has been successfully applied in road engineering due to its excellent performance; however, the most widely used rubber content is about 20%.To improve the content of waste rubber and ensure its performance, seven rubberized asphalts with different powder content were prepared by high-speed shearing. Firstly, penetration, softening point, and ductility tests were carried out to investigate the conventional physical features of high-content rubberized asphalt (HCRA). Then, the dynamic shear rheometer test (DSR) was conducted to estimate the high-temperature rheological properties. The bending beam rheometer test (BBR) was carried out to evaluate the low-temperature rheological performance. Finally, combined with the macroscopic performance test, the modification mechanism was revealed by the Fourier transform infrared reflection (FTIR) test, and scanning electron microscope (SEM) analysis was used to observe the microscopic appearance before and after aging. The results show that rubberized asphalt has excellent properties in high- and low-temperature conditions, and fatigue resistance is also outstanding compared with neat asphalt. As the crumb rubber content increases, it is evident that the 40% RA performance is the best. The low-temperature properties of HCRA are better than the traditional 20% rubberized asphalt. This study provides a full test foundation for the efficient utilization of HCRA in road engineering.

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Preparation and Evaluation of Performance and Mechanism of Gallic Acid–Rubber Powder–Microalgae bio-oil/Styrene Block Copolymers Composite Modified Asphalt

Jiang

Liu²,

Yaseen³

et al. 2022

Arab J Sci Eng

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Comparing effects of physisorption and chemisorption of bio-oil onto rubber particles in asphalt

Cited by 66 publications

References 45 publications

Study on Storage Stability of Activated Reclaimed Rubber Powder Modified Asphalt

Study on Storage Stability of Activated Reclaimed Rubber Powder Modified Asphalt

Laboratory Investigation of Rubberized Asphalt Using High-Content Rubber Powder

Preparation and Evaluation of Performance and Mechanism of Gallic Acid–Rubber Powder–Microalgae bio-oil/Styrene Block Copolymers Composite Modified Asphalt

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