Effect of crumb rubber gradation on asphalt binder modification: rheological evaluation, optimization and selection

Venudharan, Veena; Biligiri, Krishna Prapoorna

doi:10.1617/s11527-017-0994-x

Cited by 28 publications

(7 citation statements)

References 24 publications

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“…Rubber crump addition by the 'wet' method or the 'dry' one has a positive influence on different properties of asphalt binder as well as asphalt mixture, which is confirmed by a great number of tests [4,5,6,7,8,9,10,11,12,13,14]. The influence depends on the degree of fineness and the amount of used granulated rubber which affect the bitumen viscosity, its rheological properties, softening point change, the binder penetration and values of dynamic shear modulus [15,16,17,18].…”

Section: Introductionmentioning

confidence: 87%

Assessment of temperature susceptibility for rubber granulate modified road asphalt binders considering impact of aging

et al. 2018

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The article presents the results of research on temperature sensitivity of ground rubber modified asphalt binders. The tests were performed for 50/70 penetration grade road bitumen and two kinds of granulated rubber: activated and inactivated. Such parameters of asphalt binders as: penetration, softening point, dynamic shear modulus and phase angle have been determined and on this basis the temperature susceptibility of the reference bitumen and asphalt binders modified by activated and inactivated rubber have been determined. All the tests were carried out for three observation levels: without aging and after aging simulations carried out by RTFOT and PAV methods. The tests revealed that addition of granulated rubber has a positive influence on asphalt binder properties, even after the aging process, causing an increase in the softening point and a decrease in penetration and the phase angle of asphalt binder. Asphalt binders obtained in result of modification by addition of rubber show smaller temperature susceptibility than the reference bitumen (without addition of rubber). Also, a positive impact of aging on the temperature susceptibility was observed for the investigated binders.

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Section: Introductionmentioning

confidence: 87%

Assessment of temperature susceptibility for rubber granulate modified road asphalt binders considering impact of aging

et al. 2018

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“…Materials AR-Gap mixtures were prepared by blending locally available aggregate with three rubber-modified binders, including one commercially available, CRMB60, and two laboratory prepared AR binders. Note that AR binders used for the preparation of AR-Gap mixtures were developed and customized as reported in previous studies (19)(20)(21)(22)(23). AR binders were prepared with viscosity grade, VG40, as the base binder with a crumb rubber (CR) dosage of 20% by weight of the base binder.…”

Section: Materials and Experimental Programmentioning

confidence: 99%

Conceptualization of Three-Stage Fatigue Failure in Asphalt-Rubber Gap-Graded Mixtures using Dynamic Semi-Circular Bending Test

Venudharan

Biligiri

2020

Transportation Research Record: Journal of the Transportation R

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The objective of this study was to qualitatively measure the cracking mechanism of asphalt-rubber gap-graded (AR-Gap) mixtures and compare the methodical approach proposed in this research with the conventional fatigue process. As part of experimentation plan, dynamic a semi-circular bending (SCB) test was conducted on 27 AR-Gap mixtures with varying mix parameters, including, binder type, binder content, and aggregate gradation. Fatigue life ( Nf) obtained from the dynamic SCB test was analyzed from a statistical viewpoint, and key relationships that potentially contribute to fatigue performance were identified. Later, crack mouth opening displacement (CMOD) was used to study the cracking mechanism of AR-Gap mixtures. CMOD data were analyzed using the Francken model that theorizes the accumulated damage as a three-stage failure. Further, fatigue tertiary life ( Nft) was determined on the premise of structural deterioration obtained from the three-stage failure process. The fatigue disparity factor (ξ), the ratio of Nf to Nft for each asphalt mix was estimated to compare fatigue performance indices. The score of ξ for all the mixtures exceeded 50%, which was indicative of longer crack initiation and crack propagation phase over the third stage of the fatigue cracking mechanism. Overall, the fatigue mechanism was explained through the conceptualization of the three-stage fatigue process through various intrinsic properties of AR-Gap mixtures.

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“…The destruction of chemically cross‐linked networks inside the rubber is considered the essence of devulcanization, that is, the breakage of CC, CS, and SS bonds 7,8 . After that, the millimeter‐sized crumb rubber can be dispersed at a micron level, facilitating its dispersion and increasing the content of tire rubber in asphalt 9 . Besides, more active groups can be formed at both ends of devulcanized rubber (DR) molecular chains, providing positions for reaction with polar molecules in asphalt and hence improving the compatibility between DR and asphalt 10 .…”

Section: Introductionmentioning

confidence: 99%

“…7,8 After that, the millimeter-sized crumb rubber can be dispersed at a micron level, facilitating its dispersion and increasing the content of tire rubber in asphalt. 9 Besides, more active groups can be formed at both ends of devulcanized rubber (DR) molecular chains, providing positions for reaction with polar molecules in asphalt and hence improving the compatibility between DR and asphalt. 10 However, the high-temperature properties of rubber asphalt are weakened by the destruction of the crosslinked networks of rubber.…”

Section: Introductionmentioning

confidence: 99%

Effect of dynamic vulcanization on the performance of high content rubber modified asphalt

Zhang

Yang

et al. 2023

J of Applied Polymer Sci

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High content rubber modified asphalt (HCRA) is usually prepared with devulcanized rubber (DR) in asphalt with good workability. However, the high‐temperature properties of HCRA deteriorate simultaneously. In this study, dynamic vulcanization approach was adopted to improve the high‐temperature properties of HCRA without mitigating the workability and low‐temperature performance of modified binder blends. The dynamic vulcanization process and mechanism were investigated based on the gel content, related chemical reactions, morphology, rheological behavior, and tensile properties of HCRA. The occurrence of dynamic vulcanization was confirmed by the increase in gel content. Fourier transform infrared spectroscopy reflected that CC bonds in trans‐olefins participated in dynamic vulcanization, followed by the reaction of those in conjugated olefins. Optical microscopy tests showed that dynamic vulcanization also improved the compatibility between the DR and asphalt. It was found that dynamic vulcanization of HCRA is the gradual stabilization process to form local cross‐linked networks in asphalt. With the addition of sulfur, degradation, aging, and dynamic vulcanization took place simultaneously in HCRA. Dynamic vulcanization increased the high‐temperature properties, fracture toughness, as well as storage stability of HCRA. Furthermore, dynamic vulcanization restricted rubber degradation and improved the aging behavior of HCRA.

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Effect of crumb rubber gradation on asphalt binder modification: rheological evaluation, optimization and selection

Cited by 28 publications

References 24 publications

Assessment of temperature susceptibility for rubber granulate modified road asphalt binders considering impact of aging

Assessment of temperature susceptibility for rubber granulate modified road asphalt binders considering impact of aging

Conceptualization of Three-Stage Fatigue Failure in Asphalt-Rubber Gap-Graded Mixtures using Dynamic Semi-Circular Bending Test

Effect of dynamic vulcanization on the performance of high content rubber modified asphalt

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