Aging characteristics of crumb rubber modified asphalt binder and mixture with regenerating agent

Geng, Jiuguang; Chen, Ming‐Yuan; Xia, Caiyun; Liao, Xiaofeng; Chen, Zhongda; Chen, Huaxin

doi:10.1016/j.conbuildmat.2021.124299

Cited by 11 publications

(6 citation statements)

References 30 publications

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“…The basic properties of the three asphalts, including the penetration (25 °C, 5 s, 100 g), softening point, and ductility (5 mm/min, 5 °C), were conducted, respectively, in reference to the Chinese standard JTG-E20-2011 [ 30 ]. The basic properties aging indexes RP, SPI, and RD of the three asphalts were calculate by Equations (1)–(3) [ 31 , 32 ].

…”

Section: Methodsmentioning

confidence: 99%

Evaluating the Effects of Polyphosphoric Acid (PPA) on the Anti-Ultraviolet Aging Properties of SBR-Modified Asphalt

Niu

Zhu

et al. 2023

Materials

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The ultraviolet (UV) aging of asphalt is an important factor affecting the long-term performance of asphalt pavement, especially in high altitude cold regions. The current studies have reported that styrene butadiene rubber-modified asphalt (SBRMA) has a good cracking resistance at low temperatures. In addition, polyphosphoric acid (PPA) is an effective modifier that can enhance the anti-UV aging properties of asphalt. However, the understanding of the improvement mechanism of PPA on the anti-aging of SBRMA remains unclear. Therefore, this study aimed to evaluate the effect of PPA on the UV aging resistance of SBRMA. The rheological properties of PEN90 asphalt(90#A), SBRMA, and PPA/SBR modified (PPA/SBR-MA) before and after UV aging were evaluated by dynamic shear rheometer (DSR) and bending beam rheometer (BBR) tests. The molecular weight and chemical structure of 90#A, SBRMA, and PPA/SBR-MA were determined by Fourier transform infrared spectroscopy (FTIR) and gel permeation chromatography (GPC), and the interaction and modification mechanism of the modifiers were analyzed. The rheological analysis shows that the high and low temperature performances of SBRMA are improved by adding PPA, and PPA also significantly reduces the sensitivity of SBRMA to UV aging. The microscopic test results show that PPA has a complex chemical reaction with SBRMA, which results in changes in its molecular structure. This condition enhances SBRMA with a more stable dispersion system, inhibits the degradation of the polymer macromolecules of the SBR modifier, and slows down the aging process of base asphalt. In general, PPA can significantly improve the anti-UV aging performance of SBRMA. The Pearson correlations between the aging indexes of the macro and micro properties are also significant. In summary, PPA/SBRMA material is more suitable for high altitude cold regions than SBRMA, which provides a reference for selecting and designing asphalt pavement materials in high altitude cold regions.

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…”

Section: Methodsmentioning

confidence: 99%

Evaluating the Effects of Polyphosphoric Acid (PPA) on the Anti-Ultraviolet Aging Properties of SBR-Modified Asphalt

Niu

Zhu

et al. 2023

Materials

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“…133 Also, a rubberregenerating agent composed of SBR powder, light oil, and liquid rubber has been found to improve the aging resistance of rubberized asphalt. 134 However, excessive amounts of the rubber regenerating agent (e.g., > 8 wt. %) could adversely influence the mechanical and aging performance of rubberized asphalt.…”

Section: Aging and Rejuvenation Of Rubberized Asphaltmentioning

confidence: 99%

“…Adding 4 wt. % APAO in rubberized asphalt improves the rheological properties and the high-temperature and fatigue performance of asphalt without significant sacrifice in low-temperature performance. , Furthermore, with crumb rubber, APAO reduces the generation of carbonyl groups in the long term, enhancing the aging resistance of asphalt binder. Other materials used in conjunction with crumb rubber to delay aging in asphalt are layered double hydroxides, which are UV-resistant, layered nanomaterials belonging to the anionic clay family …”

Section: Aging and Rejuvenation Of Rubberized Asphaltmentioning

confidence: 99%

“…% of poly(styrene-butadiene-styrene), or SBS, has improved the rheological characteristics and aging resistance of asphalt binder better than neat waste rubber . Also, a rubber-regenerating agent composed of SBR powder, light oil, and liquid rubber has been found to improve the aging resistance of rubberized asphalt . However, excessive amounts of the rubber regenerating agent (e.g., > 8 wt.…”

Section: Aging and Rejuvenation Of Rubberized Asphaltmentioning

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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“…Lv et al [19] proposed a viscoelastic model for the fatigue damage of asphalt mixtures that incorporated the aging effect based on the direct tensile fatigue test. Geng et al [20] addressed the influence of regenerating agents on a rubber-modified asphalt mixture after initial and secondary aging. Amani et al [21] discussed the influence of different long-term aging levels (3, 5, 7 and 9 days) upon the recovery process of a self-healing asphalt mixture, and concluded that the healing efficiency of the asphalt mixture gradually decreased as the aging time increased.…”

Section: Introductionmentioning

confidence: 99%

Damage Fracture Characterization of Asphalt Mixtures Considering Freeze–Thaw Cycling and Aging Effects Based on Acoustic Emission Monitoring

Zhou

Yuan³

et al. 2021

Materials

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Freeze–thaw (F–T) cycling and aging effects are the main factors contributing to the deterioration of asphalt mixtures. The acoustic emission (AE) technique enables real-time detection regarding the evolution of internal damage in asphalt mixtures during the loading process. This study set out to investigate the effects of F–T cycling and aging on the damage characteristics of asphalt mixture under splitting loads. Firstly, the Marshall specimens were prepared and then exposed to various numbers of F–T cycles (one, three, five, and seven) and different durations of aging (short-term aging and long-term aging for 24, 72, 120 and 168 h), after which the specimens were loaded by means of indirect tensile (IDT) testing, and corresponding parameters were synchronously collected by the AE acquisition system during the fracture process. Finally, the energy, cumulative energy and peak frequency were selected to investigate the damage mechanisms of asphalt mixtures. The findings demonstrate that the AE parameters provided effective identification of the deterioration for all specimens in real-time, and that the F–T cycling and aging effects altered the damage characteristics of asphalt mixtures, causing early damage, exacerbating the formation of micro-cracks in the early stage, accelerating the expansion of macro-cracks and advancing the debonding between the asphalt and aggregates. The findings of this study provide further insight into the mechanism of F–T cycling and aging effects on the deterioration of asphalt mixture.

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Aging characteristics of crumb rubber modified asphalt binder and mixture with regenerating agent

Cited by 11 publications

References 30 publications

Evaluating the Effects of Polyphosphoric Acid (PPA) on the Anti-Ultraviolet Aging Properties of SBR-Modified Asphalt

Evaluating the Effects of Polyphosphoric Acid (PPA) on the Anti-Ultraviolet Aging Properties of SBR-Modified Asphalt

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

Damage Fracture Characterization of Asphalt Mixtures Considering Freeze–Thaw Cycling and Aging Effects Based on Acoustic Emission Monitoring

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