Effect of Sodium Hypochlorite-Activated Crumb Rubber on Rheological Properties of Rubber-Modified Asphalt

Li, Bo; Li, Qidong; Zhu, Xuwei; Wei, Yongzheng; Li, Zhiwei; Wei, Dingbang

doi:10.1061/(asce)mt.1943-5533.0003403

Cited by 9 publications

(5 citation statements)

References 40 publications

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“…In addition, bitumen modified with crumb rubber activated with sodium hypochlorite (NaClO) exhibits lower rutting susceptibility and higher workability (lower viscosity) . These improvements have been attributed to increased energy, polarity, and roughness on the rubber surface . Tetraethyl orthosilicate (TEOS) has also been shown to facilitate the entanglement of molecular chains between asphalt and modified rubber, increasing the storage stability of asphalt …”

Section: Rubber Treatment Technologiesmentioning

confidence: 99%

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Review and Perspectives of End-of-Life Tires Applications for Fuel and Products

Kazemi,

Parikhah Zarmehr,

Yazdani

et al. 2023

Energy Fuels

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Applications of end-of-life tires (ELT) for energy recovery and new products can contribute to a circular economy. This paper reviews the environmental, health, and economic aspects of various applications of ELT, focusing specifically on the use of ELT in fuel, energy, and construction. Impediments to a more widespread application of repurposed ELT include a lack of streamlined handling and recycling processes; a poor understanding of the long-term ecological, human health, and safety consequences; and very few application-specific techno-economic assessments and life-cycle analyses. The prospects for rubberized asphalt as an economical and environmentally benign application of ELT are reviewed in four areas: (1) rubber pretreatmentthe most effective techniques are chemical or microwave radiation, and the most sustainable technique is microbial devulcanization; (2) aging behaviorrubber particles delay aging in asphalt through several mechanisms; (3) techno-economic benefitsrubberized asphalt improves the cost-efficiency and energy-efficiency of asphalt; and (4) environmental emissions and leakage concernsthe risk of heavy metals and hazardous pollutants such as polycyclic aromatic hydrocarbons and volatile organic compounds contaminating the ecosystem or causing occupational diseases in workers. There are four priority directions for future research on rubberized asphalt: (1) determine the critical aging point; (2) describe the self-rejuvenating behavior; (3) quantify the long-term leachate under extensive weathering; and (4) compare the ecological aspects of pretreatment techniques in terms of potential greenhouse gas emissions and human health.

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Section: Rubber Treatment Technologiesmentioning

confidence: 99%

“…71 These improvements have been attributed to increased energy, polarity, and roughness on the rubber surface. 74 Tetraethyl orthosilicate (TEOS) has also been shown to facilitate the entanglement of molecular chains between asphalt and modified rubber, increasing the storage stability of asphalt. 75 3.3.…”

Section: Thermomechanical Treatmentmentioning

confidence: 99%

Review and Perspectives of End-of-Life Tires Applications for Fuel and Products

Kazemi,

Parikhah Zarmehr,

Yazdani

et al. 2023

Energy Fuels

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“…The aging of the asphalt binder's molecular motility is reduced, and the polar component aggregation is hindered, so that the size of the bee structure depends on the size of the decrease, the number of increasements in the proportion of the area, and the height of the decrease. The rejuvenator can enhance the ability of the molecular motility of the asphalt binder to promote the aggregation of polar components so that the microstructure of the asphalt binder can be restored [24].…”

Section: Introductionmentioning

confidence: 99%

Effect of Simultaneous Changes in Asphalt Binder Bee Structure Components on Mechanical Properties during the Aging and Rejuvenation Process

Huo,

Yao,

Guo

et al. 2023

Applied Sciences

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The bee structure of an asphalt binder surface changes during the aging and rejuvenation process, and the effect of this microstructural change on the mechanical properties of the asphalt binder is not clear. Therefore, in this paper, a two-dimensional finite element model of an asphalt binder microstructure was constructed based on processed AFM images, and the contents of bee phases and bee casings were varied at the same time to analyze the stress and strain distribution law of the asphalt binder microstructure. The results of the study show that in the bee structure, the stress in the bee phase is obviously greater than that in the bee casing, and the stress in the interstitial phase is the lowest. With the simultaneous enhancement in the proportion of the bee phase and the bee casing, the stresses in the asphalt samples increased in all phase structures. Under the combined effect of the decrease in the content of the bee phase and the increase in the content of the bee casing, there is a certain degree of increase in the internal stresses and strains in the asphalt binder, the effect of the bee casing on the internal stresses in the asphalt binder is more pronounced, and the bee phase and the bee casing play better roles in resisting the external deformation due to the increase in the volume fraction. For a recycled asphalt binder, whether there is an increase in the dosage of the old asphalt binder or an enhancement in the interfacial diffusion and a fusion of new and old asphalt binders, the level of tensile strain within the recycled asphalt binder will increase to a certain extent, which, in turn, will put forward a higher requirement for its anti-cracking ability.

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“…Because of the ability of crumb rubber powder (P) to enhance the asphalt binder and mixture performance [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ], therefore, using of crumb rubbers recently increased widely in construction pavement as a probable solution in minimizing waste tires and the disposal areas. Many researchers used composite-modified asphalt containing P and different modifiers, and they examined the characteristics of the composite-modified asphalt through number of micro-analysis methods and property tests [ 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

Study on the Aging Mechanism and Microstructure Analysis of Rice-Husk-Ash- and Crumb-Rubber-Powder-Modified Asphalt

Abdelmagid

Qiu

et al. 2022

Polymers

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In this paper, the rice husk ash and crumb rubber powder were used as a combined modifier for asphalt. The impact of the aging on the physical and rheological properties of crumb rubber powder, rice husk ash, and the combined modified asphalt was studied through the rolling thin film oven (RTFO) simulations. A Fourier-transform infrared Spectroscopy (FTIR) test was used to study the aging mechanisms of the combined crumb-rubber-powder- and rice-husk-ash-modified asphalt before and after aging through the changes in functional groups. Impacts of the combined, crumb rubber powder, and rice husk ash modifiers on the anti-aging characteristic of the asphalt binder were analyzed through different aging indices and the variations in intensity of the absorption peaks. According to the combined results, the addition of the combined crumb rubber powder, and rice husk ash could enhance the thermal oxidative aging resistance binder. Moreover, the optimal content of composite modified asphalt was (7% rice husk ash + 10% crumb rubber powder). In addition, the combined modified asphalt binder had all the peaks of neat asphalt, rice-husk-ash-modified asphalt, and crumb-rubber-powder-modified asphalt and no appearance of new peaks. A scanning electron microscope (SEM) test was carried out to observe the microstructure of the combined crumb-rubber-powder- and rice-husk-ash-modified asphalt binders. The obtained result demonstrated that different SEM images showed that the combined crumb rubber powder, and rice husk ash modifiers were uniformly dispersed inside the asphalt binder and consequently leading to format a homogeneous blended binder.

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Effect of Sodium Hypochlorite-Activated Crumb Rubber on Rheological Properties of Rubber-Modified Asphalt

Cited by 9 publications

References 40 publications

Review and Perspectives of End-of-Life Tires Applications for Fuel and Products

Review and Perspectives of End-of-Life Tires Applications for Fuel and Products

Effect of Simultaneous Changes in Asphalt Binder Bee Structure Components on Mechanical Properties during the Aging and Rejuvenation Process

Study on the Aging Mechanism and Microstructure Analysis of Rice-Husk-Ash- and Crumb-Rubber-Powder-Modified Asphalt

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