Thermo-stability and aging performance of modified asphalt with crumb rubber activated by microwave and TOR

Liang, Ming; Xue, Xin; Fan, Weiyu; Ren, Shisong; Jian, Shi; Luo, Haiwen

doi:10.1016/j.matdes.2017.04.060

Cited by 111 publications

(36 citation statements)

References 43 publications

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“…However, compared to neat bitumen, the aging mechanism for CRMB is much more complex because of the interaction between crumb rubber modifier (CRM) and bitumen and the unique chemical compositions of CRM. Two parallel reactions were reported during the aging process of CRMB: the aging of the bitumen phase and the degradation of included rubber particles [12]. During the preparation of a bitumen-rubber blend, crumb rubber particles absorb the low-molecularweight fractions of bitumen (part of the maltenes) because of the thermodynamic compatibility and swell up to several times their original sizes at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

Effect of laboratory aging on chemistry and rheology of crumb rubber modified bitumen

et al. 2020

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Aging during construction and in-service substantially changes the chemical composition and physical properties of bitumen thereof influences the performance of asphalt pavements. The modification of bitumen by crumb rubber modifier (CRM) significantly increases the complexity of the aging mechanism and is expected to improve the aging resistance of bitumen. This study aims to investigate the effects of laboratory short-term and long-term aging on the chemistry and rheology of crumb rubber modified bitumen (CRMB). Neat bitumen and CRMB with four different CRM contents were studied. Fourier transform infrared spectroscopy and dynamic shear rheometer were employed to measure the change in the chemical composition and rheological properties of binders at different aging states. Bitumen hardening, which was rheologically revealed by the frequency sweep and multiple creep recovery test results, was also reflected in the growth of carbonyl and sulfoxide functional groups. In addition, the aliphaticity and aromaticity indices of binders before and after aging were also investigated. CRMB binders showed improved aging resistance compared to neat bitumen as reflected by the decreased carbonyl and sulfoxide indices as well as the lower change in rheological parameters. Higher resistance against aging was achieved when increasing the CRM content. The results also highlight the correlation between chemistry and rheology of bitumen. Among six selected mechanical parameters of binder, the nonrecoverable creep compliance and percent recovery show better correlations with the combined chemical aging index (sum of carbonyl and sulfoxide indices) than the parameters derived from the linear viscoelastic region.

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Section: Introductionmentioning

confidence: 99%

Effect of laboratory aging on chemistry and rheology of crumb rubber modified bitumen

et al. 2020

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“…The swelling of CR also leads to an excessively high viscosity of rubberized bitumen. To resolve the limitation of rubberized bitumen, different modification methods have been proposed to reduce the incompatibility and high viscosity of rubberized bitumen [ 5 , 6 , 7 , 8 , 9 , 10 ]. Warm mix additives (WMA) and pre-degradation CR were two effect methods to decrease the high viscosity of rubberized bitumen.…”

Section: Introductionmentioning

confidence: 99%

“…It has also been found that enhancing chemical bonding could improve the compatibility of rubberized bitumen [ 4 , 5 , 6 , 7 , 9 ]. Various crosslinking agents have been developed to enhance the interfacial strength between CR and bitumen, among which TOR reveals efficient modification effect [ 26 , 27 , 28 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

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Laboratory Investigation of Aging Resistance for Rubberized Bitumen Modified by Using Microwave Activation Crumb Rubber and Different Modifiers

et al. 2020

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Different modification methods, such as adding modifiers and pretreating crumb rubber, have been developed to achieve decent engineering properties and reduce the viscosity of rubberized bitumen. This study evaluated the influence of the modification methods on the aging resistance for rubberized bitumen. Two types of crumb rubber—a 40-mesh crumb rubber and a microwave-pretreated crumb rubber—and two kinds of modifiers—Sasobit and Trans-polyoctenamer—were selected to prepare rubberized bitumen. The samples were subjected to a Thin-Film Oven Test for the simulation of the short-term aging condition, while a Pressure-Aging-Vessel test was used to simulate the long-term aging condition. The indexes of rubberized bitumen, including softening point, elastic recovery ratio, maximum load, ductility, fracture energy, phase angle, and dynamic modulus, were tested before and after aging. The result showed that trans-polyoctenamer displayed the best resistance to short-term aging, while Sasobit significantly improved the fracture energy of rubberized bitumen after short-term aging. Microwave pretreated partially destroyed the internal structure of crumb rubber, leading to a decrease of short-term aging resistance for rubberized bitumen. Compared with short-term aging, the changing trends of various indexes were basically same, except the discrepancy of properties indexes was reduced after long-term aging.

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“…Researchers and constructors find that CR would gradually segregate from the top asphalt and sink to the bottom during all mixing, transporting, and construction procedures, which finally results in uneven road performance of pavement, such as weeping (extensive oil), rutting, and aging. All these diseases may be accrued at the very beginning and be harmful to the long-term servicing [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Silane Modification of Crumb Rubber on the Rheological Properties of Rubberized Asphalt

Zhang

Liu

Peng³

2019

Applied Sciences

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Because there is a lack of studies on rubberized asphalt based on silane coupling agent modification, KH-550 modified crumb rubber and rubberized asphalts incorporating normal rubber and modified rubber were prepared, respectively. The rheological properties of asphalt samples were evaluated by a dynamic shearing rheometer and a bending beam rheometer; then, mechanisms of KH-550 on rubber surface and functional group changes were analyzed by a Brunauer–Emmett–Teller specific surface area measurement and a Fourier transform infrared spectroscopy. The results imply that: (i) rubber surface area rises and chemical reactions accrue between rubber and asphalt; (ii) modified rubber achieves a more stable state within asphalt, which helps to enhance the mechanical properties of asphalt; (iii) modified rubber helps asphalt to dissipate stress so as to resist the formation of cracks and deformation under low temperature conditions.

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Thermo-stability and aging performance of modified asphalt with crumb rubber activated by microwave and TOR

Cited by 111 publications

References 43 publications

Effect of laboratory aging on chemistry and rheology of crumb rubber modified bitumen

Effect of laboratory aging on chemistry and rheology of crumb rubber modified bitumen

Laboratory Investigation of Aging Resistance for Rubberized Bitumen Modified by Using Microwave Activation Crumb Rubber and Different Modifiers

Silane Modification of Crumb Rubber on the Rheological Properties of Rubberized Asphalt

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