Effect of long-term aging on waste tire rubber and amorphous poly alpha olefin compound modified asphalt binder and its mixtures

Wang, Shaoquan; Gao, Ying; Yan, Kezhen; You, Lihua; Jia, Yanshun; Dai, Xiongwei; Chen, Ming; Diab, Aboelkasim

doi:10.1016/j.conbuildmat.2020.121667

Cited by 25 publications

(8 citation statements)

References 48 publications

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“…It has been found that adding crumb rubber powder as a modifier into asphalt for modification can effectively improve the technical properties of bitumen, thus that the road performance and service quality of the modified asphalt mixture can meet the requirements of road traffic operations [ 11 , 12 , 13 ]. Crumb rubber modified asphalt mixture has excellent high and low temperature performance, weatherability, elasticity, and anti-aging properties, can reduce pavement thickness, reduce traffic noise, and effectively prevent freezing in cold areas, and prolong the service life of the pavement [ 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Desulfurization Process Variables on the Properties of Crumb Rubber Modified Asphalt

Zhang

Zhang²,

Chen³

et al. 2022

Polymers

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A large number of waste tires are in urgent need of effective treatment, and breaking waste tires into crumb rubber powder for modifying asphalt has been proved as a good idea to solve waste tires. Crumb rubber modified asphalt not only has good high and low temperature performance, durability, and aging resistance but can also reduce pavement noise and diseases, which has wide application prospects. In this study, crumb rubber powder was desulfurized by mechanochemical method to prepare desulfurized crumb rubber modified asphalt. During the desulfurization process of crumb rubber, the effects of desulfurization process variables including desulfurizer type, desulfurizer content, and desulfurization mixing temperature and time were considered, and then the physical properties of modified asphalt were tested. The test results showed that after mixing crumb rubber powder with desulfurizer, the viscosity of crumb rubber powder modified asphalt can be reduced. Moreover, the storage stability of crumb rubber powder modified asphalt could also be improved by mixing crumb rubber with desulfurizer. Based on the physical properties of crumb rubber powder modified asphalt, the desulfurization process of selected organic disulfide (OD) desulfurizer was optimized as follows: the OD desulfurizer content was 3%, the desulfurization mixing temperature was 160 °C, and the mixing time was 30 min. In addition, Fourier infrared spectroscopy analysis was carried out to explore the modification mechanism of desulfurized crumb rubber powder modified asphalt. There is no fracture and formation of chemical bonds, and the modification of asphalt by crumb rubber powder is mainly physical modification.

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Section: Introductionmentioning

confidence: 99%

Effect of Desulfurization Process Variables on the Properties of Crumb Rubber Modified Asphalt

Zhang

Zhang²,

Chen³

et al. 2022

Polymers

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“…In a high-temperature operating environment, volatilization of light components is the main reason for asphalt aging at this stage. As for long-term thermo-oxidative aging of asphalt, this is referred to as the combination of asphalt molecules with unstable groups or long branched chains with oxygen, namely, an oxidation reaction . Moreover, some products generated during aging processes can further polymerize and form macromolecular substances.…”

Section: Introductionmentioning

confidence: 99%

“…When the absorbing energy of the asphalt molecules reaches a critical value, some of the chemical bonds break and form free radicals. Subsequently, with the participation of oxygen, a condensation reaction takes place, and polar functional groups, such as carbonyl groups and sulfoxide groups, are generated. ,,− As a result, the proportion of asphaltenes and resins in asphalt increases, stiffening the asphalt material.…”

Section: Introductionmentioning

confidence: 99%

“…On the basis of the mechanisms, various measures are being employed to retard asphalt aging. Adding asphalt modifiers is commonly used due to its advantages of convenient operation and efficient modification effects. ,,,, In terms of improving the resistance of asphalt to thermo-oxidative aging, polymers and antioxidants are two common choices. , With the introduction of polymer modifiers, the aging resistance of asphalt can be enhanced by their absorption to oxygen, and thus, chances of exposure to air are reduced for asphalt. , But polymer modifiers, as organic products, will gradually degrade and fail eventually. Similarly, the antioxidants work by trapping or eliminating free radicals, but they will get oxidized finally .…”

Section: Introductionmentioning

confidence: 99%

“…As for long-term thermo-oxidative aging of asphalt, this is referred to as the combination of asphalt molecules with unstable groups or long branched chains with oxygen, namely, an oxidation reaction. 29 Moreover, some products generated during aging processes can further polymerize and form macromolecular substances. In addition, the reason for asphalt aging induced by ultraviolet radiation is that several asphalt molecules absorb ultraviolet energy and then are activated.…”

Section: Introductionmentioning

confidence: 99%

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Mini-Review on the Application of Nanomaterials in Improving Anti-Aging Properties of Asphalt

et al. 2021

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Exposed to detrimental environmental factors, such as heat, oxygen, and ultraviolet (UV) radiation, asphalt materials are prone to hardness and brittleness, namely, asphalt aging, which leads to deteriorating asphalt pavement properties and inducing a series of road distress. Theoretical and experimental studies have demonstrated that nanomaterial modifiers are a promising solution. This review discusses the application of single, compounded, and composited nanomaterial modifiers in improving the aging resistance of asphalt. Results showed that the introduction of single nanosilica, nanotitanium dioxide, and nanozinc oxide imparts positive effects on the anti-UV aging properties of asphalt, and single nanocalcium carbonate, carbon nanotubes, and layered silicates retard the thermo-oxidative aging rate of asphalt. Moreover, the multi-dimensional nanomaterial modifiers, a compound of nanometal oxide and layered silicates, comprehensively enhance the anti-thermo-oxidative and anti-UV aging properties of base asphalt and polymer-modified asphalt. Additionally, the composited nanomaterial modifiers could exert synergetic effects on asphalt properties and be a crucial area for future research. With the addition of nanomaterial modifiers, the asphalt aging processes are restrained by arresting volatile components of asphalt and lengthening the diffusion paths of oxygen molecules into asphalt binders. Another contribution mainly derives from functional groups against oxygen, which hinder the occurrences of oxidation reactions of asphalt. Many factors, such as nanomaterial modifier types, organic modification, nanomaterial concentration, and mixing methods and parameters, have influenced the anti-aging properties of nanomaterial-modified asphalt. In addition, the compatibility between nanomaterial modifiers with asphalt and nanomaterial dispersion in asphalt and the high costs involved in using nanomaterial modifiers are critical challenges for the application of nanomaterials in improving the aging resistance of asphalt. However, with cooperation between industrial communities and research institutes, an expanding application scale of nanomaterial-modified asphalt can be expected.

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Multiscale mechanisms of asphalt performance enhancement by crumbed waste tire rubber: insight from molecular dynamics simulation

Chen

et al. 2021

J Mol Model

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The recycling of crumbled waste tire rubber (CWTB) is a major environmental problem facing mankind, and the incorporation of CWTB as a modi er into asphalt is an extremely promising approach. However, the modi cation mechanism of CWTB to asphalt is not well understood, which restricts the development of CWTB-modi ed asphalt. In this study, the mechanism of CWTB modi cation of asphalt was explored in depth by dynamic mechanical analysis (DMA), uorescence microscopy, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and molecular dynamics (MD) simulations. The results of the study showed that CWTB enhanced the high temperature performance of the base asphalt. The microscopic mechanism by which this phenomenon occurs is that CWTB has the largest binding energy with the aromatics (1100-1400 kcal/mol), followed by the saturates (700-900 kcal/mol), followed by the resins (200-450 kcal/mol), and the smallest binding energy with the asphaltenes (110-160 kcal/mol), which causes CWTB to absorb the light components of the asphalt (aromatics and saturates). In the process of absorbing the light components, CWTB will gradually swell, which causes CWTB to bind more and more tightly with the base asphalt, and eventually the good high temperature performance of CWTB is transferred to the base asphalt. The macroscopic manifestation of this process is that the rutting factor of CWTB modi ed asphalt is signi cantly higher than that of virgin asphalt. This study can provide basic theoretical support for the application of CWTB modi ed asphalt.

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Effect of long-term aging on waste tire rubber and amorphous poly alpha olefin compound modified asphalt binder and its mixtures

Cited by 25 publications

References 48 publications

Effect of Desulfurization Process Variables on the Properties of Crumb Rubber Modified Asphalt

Effect of Desulfurization Process Variables on the Properties of Crumb Rubber Modified Asphalt

Mini-Review on the Application of Nanomaterials in Improving Anti-Aging Properties of Asphalt

Multiscale mechanisms of asphalt performance enhancement by crumbed waste tire rubber: insight from molecular dynamics simulation

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