Evaluation of Viscoelastic and Fracture Properties of Asphalt Mixtures with Long-Term Laboratory Conditioning

Rahbar-Rastegar, Reyhaneh; Daniel, Jo Sias; Dave, Eshan V.

doi:10.1177/0361198118795012

Cited by 30 publications

(6 citation statements)

References 12 publications

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“…Uniaxial direct tension cyclic testing was conducted following AASHTO TP 107 to evaluate the fatigue behavior of the asphalt mixtures. The simplified viscoelastic continuum damage (S-VECD) approach with the damage characteristic curve (DCC) and the performance parameter D R were used to estimate the ability of the mixtures to resist fatigue cracking (12)(13)(14).…”

Section: Testing and Analysis Methodsmentioning

confidence: 99%

Impact of Aging on the Viscoelastic Properties and Cracking Behavior of Asphalt Mixtures

Zhang

Sias

Dave

et al. 2019

Transportation Research Record

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Aging can significantly affect the viscoelastic properties and cracking behavior of asphalt mixtures, causing increase in stiffness, reduction in relaxation capability, and increase in brittleness. Eleven mixtures are evaluated using different laboratory conditioning protocols to evaluate how the properties of asphalt mixtures, including viscoelastic properties, fatigue, and fracture behavior will change over time. Comparisons between different aging levels and mixtures are conducted by using complex modulus (E*) (field cores are included), simplified viscoelastic continuum damage (S-VECD) approach, semi-circular bending (SCB), and disk shaped compact tension (DCT) fracture tests. The climatic aging index developed by the NCHRP 09-54 project is utilized in this study to calculate the appropriate field aging duration corresponding to the different laboratory aging protocols. Pavement evaluation tools FlexPAVETM and IlliTC are also used to predict and compare the fatigue and thermal cracking performance of these mixtures. The results of E* and S-VECD tests indicate that the mixtures are more prone to fatigue cracking with aging, and the two long-term conditioning protocols induce statistically similar changes in linear viscoelastic and fatigue properties. However, prediction of fatigue performance from FlexPAVE TM does not show a consistent trend once pavement structure and traffic are considered. Fracture tests and IlliTC predictions show the virgin mixtures and those with soft base binders will have better capability to resist cracking after long-term aging. In this study, the two mixtures with the largest difference between high and low temperature performance grade (PG) show the largest change in fracture and fatigue properties with aging.

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Section: Testing and Analysis Methodsmentioning

confidence: 99%

Impact of Aging on the Viscoelastic Properties and Cracking Behavior of Asphalt Mixtures

Zhang

Sias

Dave

et al. 2019

Transportation Research Record

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“…Aging causes stiffening of bitumen with reduced molecular flow, which can be verified by the increase in viscosity and complex modulus and decrease in phase angle [7,8]. The stiffening effect increases the permanent deformation resistance, but reduces the relaxation capacity under environmental and traffic loadings resulting in performance deterioration of asphalt pavements [9,10].…”

Section: Introductionmentioning

confidence: 97%

Effect of laboratory aging on chemistry and rheology of crumb rubber modified bitumen

et al. 2020

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Aging during construction and in-service substantially changes the chemical composition and physical properties of bitumen thereof influences the performance of asphalt pavements. The modification of bitumen by crumb rubber modifier (CRM) significantly increases the complexity of the aging mechanism and is expected to improve the aging resistance of bitumen. This study aims to investigate the effects of laboratory short-term and long-term aging on the chemistry and rheology of crumb rubber modified bitumen (CRMB). Neat bitumen and CRMB with four different CRM contents were studied. Fourier transform infrared spectroscopy and dynamic shear rheometer were employed to measure the change in the chemical composition and rheological properties of binders at different aging states. Bitumen hardening, which was rheologically revealed by the frequency sweep and multiple creep recovery test results, was also reflected in the growth of carbonyl and sulfoxide functional groups. In addition, the aliphaticity and aromaticity indices of binders before and after aging were also investigated. CRMB binders showed improved aging resistance compared to neat bitumen as reflected by the decreased carbonyl and sulfoxide indices as well as the lower change in rheological parameters. Higher resistance against aging was achieved when increasing the CRM content. The results also highlight the correlation between chemistry and rheology of bitumen. Among six selected mechanical parameters of binder, the nonrecoverable creep compliance and percent recovery show better correlations with the combined chemical aging index (sum of carbonyl and sulfoxide indices) than the parameters derived from the linear viscoelastic region.

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“…With this method, various additives are added to the binder to improve its properties. The high quality bitumen obtained will make the pavement stronger against heavy and repetitive traffic loads, environmental effects, temperature differences [7][8][9][10]. A wide variety of additives can be used to modify the bitumen.…”

Section: Introductionmentioning

confidence: 99%

Investigation of flow properties and activation energy of magnesium lignosulfonate modified bitumen

Ozdemir

Yilmaz

2023

FUJECE

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Recently, many studies have been carried out on the use of waste materials in bitumen modification. In this way, environmental and economic benefits are obtained and a field of use is created for waste materials. In this study, magnesium lignosulfonate (MLS), which is an organic waste material released during paper production from wood, was added to B50/70 bitumen. Penetration, softening point, rolling thin film oven test (RTFOT) and rotational viscometer (RV) tests were performed on modified binders. As a result of the experiments, it was determined that MLS increased the consistency, softening point and short-term aging resistance of the asphalt and decreased the temperature sensitivity. In addition, the activation energy values were determined using the Arrhenius equation and the flow properties were evaluated.

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Evaluation of Viscoelastic and Fracture Properties of Asphalt Mixtures with Long-Term Laboratory Conditioning

Cited by 30 publications

References 12 publications

Impact of Aging on the Viscoelastic Properties and Cracking Behavior of Asphalt Mixtures

Impact of Aging on the Viscoelastic Properties and Cracking Behavior of Asphalt Mixtures

Effect of laboratory aging on chemistry and rheology of crumb rubber modified bitumen

Investigation of flow properties and activation energy of magnesium lignosulfonate modified bitumen

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