Black curves and creep behaviour of crumb rubber modified binders containing warm mix asphalt additives

Gallego, Juan; Rodríguez-Alloza, Ana María; Giuliani, Felice

doi:10.1007/s11043-016-9300-5

Cited by 25 publications

(5 citation statements)

References 16 publications

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“…The incorporation of the wax increases the solid-like behaviour, as stated by other studies [14,24].…”

Section: = • •supporting

confidence: 78%

“…On the other hand, the addition of rubber improves the properties of the bitumen, increasing the elasticity and decreasing the thermal sensitivity [13]. However, the higher viscosity of this bitumen force the mixture to be produced at a greater temperature, which increases the energy consumption and the greenhouse gas emissions to air [14], hindering its use. Therefore, a fatty acid amide wax was used to neutralize this effect.…”

Section: Introductionmentioning

confidence: 99%

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Porous asphalt mixture with alternative aggregates and crumb-rubber modified binder at reduced temperature

Lastra-González

Calzada-Pérez

Vega-Zamanillo

et al. 2017

Construction and Building Materials

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This paper studies the design and characterization of a PA mixture with 91% of EAF slag, using a commercial CRM binder. A fatty acid amide wax was added to decrease the mixture manufacturing temperature. The mechanical performance of the designed mixtures was studied with the determination of void characteristics, water sensitivity, and particle loss in dry and wet conditions. Finally, their compactability, stiffness and fatigue resistance were also analysed. The addition of the wax allowed to decrease the manufacturing temperature 15 °C. Besides, the wax increased the complex modulus of bitumen, increasing also the elastic component and decreasing the thermal susceptibility, although these modifications did not have a significant impact in the mechanical performance of the mixture.

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“…The incorporation of the wax increases the solid-like behaviour, as stated by other studies [14,24].…”

Section: = • •supporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Porous asphalt mixture with alternative aggregates and crumb-rubber modified binder at reduced temperature

Lastra-González

Calzada-Pérez

Vega-Zamanillo

et al. 2017

Construction and Building Materials

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“…The black diagram is the curve of δ as a function of G * , which could be used to verify the validity of time–temperature superposition principle (TTSP) of some materials with complex viscoelastic properties. It is a convenient and intuitive method that does not require the calculation of experimental data (Gallego et al ., 2016). If the black curves of CRMA or DCRMA are smooth at different temperatures, it means that the TTSP is suitable for the asphalt binder.…”

Section: Resultsmentioning

confidence: 99%

“…2.2.9 Fluorescence micrographs. Polymer modifiers (such as SBS, CR) can emit fluorescence with longer wavelengths light (green or yellow) when irradiated under irradiation with a shortwavelength light source (blue, violet or ultraviolet) (Yi et al, 2020;Gallego et al, 2016;Zhang et al, 2016). In this study, an epifluorescence microscope was applied to characterize the morphological structure of CR modifier in asphalt binder.…”

Section: Properties Of Dcrmamentioning

confidence: 99%

Preparation and properties of a newly developed devulcanized and pyrolytic crumb rubber modified asphalt

Jiao,

Pan,

Guo

2023

MMMS

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Purpose The purpose of this article is to determine the parameters of the preparation process for devulcanized and pyrolytic crumb rubber modified asphalt (DCRMA) and then study the rheological and microscopic properties of DCRMA through experiments.Design/methodology/approach In this study, a new preparation process for DCRMA was developed, then the penetration, softening point and viscosity tests were employed to determine the parameters of the preparation process. The crumb rubber (CR) solubility, Fluorescence microscopy (FM), Fourier Transform Infrared (FTIR) spectroscopy and thermogravimetric analysis tests were conducted to verify the devulcanized and pyrolytic effectiveness of the preparation process. Furthermore, dynamic shear rheometer and bending beam rheometer were used to characterize the high and low-temperature rheological properties of DCRMA.Findings The results showed that the penetration balanced the CR degradation and the virgin asphalt aging well and thus could be used as a main parameters control indicator. The CR solubility, FM and FTIR tests proved that the CR has been fully devulcanized and pyrolytic via the preparation process. The DCRMA exhibited better low-temperature and fatigue performance and lower rutting performance than the conventional crumb rubber modified asphalt (CRMA) with the same CR content. Finally, the time–temperature superposition principle could be employed for all binders in this study.Originality/value A new preparation process for DCRMA was developed.

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“…However, part of the excessive rubber powder content is free in the asphalt and cannot be completely integrated with the asphalt. Juan Gallego [11] was able to reduce the compaction and storage temperature of asphalt rubber mixture by adding a warm mixing agent to asphalt rubber. Energy consumption and greenhouse gas emissions have been effectively reduced.…”

Section: Introductionmentioning

confidence: 99%

Research on the Viscosity-Temperature Properties and Thermal Stability of Stabilized Rubber Powder Modified Asphalt

Guo

Ping

et al. 2021

Sustainability

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A stabilized rubber powder-modified asphalt was provided for the field of rubber asphalt, and the optimal blending amount of stable rubber powder was determined from indicators, such as penetration, penetration index, ductility, softening point, and viscosity at 135 °C. The viscoelastic curve was measured, and the thermal storage stability test showed that the stabilized rubber powder-modified asphalt has significant thermal storage stability. The specific surface area, scanning electron microscope, and differential scanning calorimeters were used to analyze the dispersion state and aggregation state of the rubber powder particles in the stabilized rubber powder-modified asphalt, etc. The swelling state and reaction mechanism of the rubber powder in the stabilized rubber powder-modified asphalt have been characterized. The results show that the temperature sensitivity of the asphalt was improved after the stabilized rubber powder was added. The content of the stabilized rubber powder was determined to be 30%, which effectively reduces the viscosity at 135 °C, and the workability is improved; the impact of rubber powder-modified asphalt was less than that of ordinary rubber asphalt, but the temperature should be strictly controlled to ensure the viscosity of stable rubber powder-modified asphalt; the specific surface area comparison test shows that the stable rubber powder has better performance than ordinary rubber powder and asphalt matrix. The advantage of having a larger contact area enhances the compatibility of stabilized rubber powder with asphalt; scanning electron microscopy and differential scanning calorimeters test results show that the stable rubber powder-modified asphalt is mainly based on the compatibility mechanism, and a series of processes, such as oil absorption swelling-high temperature shear-compatible dispersion, occur.

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Black curves and creep behaviour of crumb rubber modified binders containing warm mix asphalt additives

Cited by 25 publications

References 16 publications

Porous asphalt mixture with alternative aggregates and crumb-rubber modified binder at reduced temperature

Porous asphalt mixture with alternative aggregates and crumb-rubber modified binder at reduced temperature

Preparation and properties of a newly developed devulcanized and pyrolytic crumb rubber modified asphalt

Research on the Viscosity-Temperature Properties and Thermal Stability of Stabilized Rubber Powder Modified Asphalt

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