Maxwell Model Analysis of Bitumen Rheological Data

Badami, Joseph V.; Greenfield, Michael L.

doi:10.1061/(asce)mt.1943-5533.0000318

Cited by 10 publications

(4 citation statements)

References 8 publications

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“…Inspired by Badami and Greenfield 40 and Hartkamp et al, 41 the stress relaxation is fitted to an extended Maxwell model of the form…”

Section: A Mechanical Propertiesmentioning

confidence: 99%

“…It is worth noting that using a large spectrum of fixed characteristic times and fitting the corresponding amplitudes as performed in Ref. 40 for data over a wider range of time scales yield poor agreement between Eq. (10) and simulation data.…”

Section: A Mechanical Propertiesmentioning

confidence: 99%

“…Note that the glassy modulus, G g , and the characteristic frequency, ω c , can vary considerably depending on the crude oil source. 40 In bitumen experiments, the accessible frequency range is often limited to 10 −2 -10 2 Hz. 46 In order to study the mechanical properties in the high-frequency limit, timetemperature superposition (TTS) is often applied.…”

Section: A Mechanical Propertiesmentioning

confidence: 99%

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ROSE bitumen: Mesoscopic model of bitumen and bituminous mixtures

Lemarchand

Greenfield

Dyre

et al. 2018

The Journal of Chemical Physics

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We present a mesoscopic model for bitumen and bituminous mixtures. The model, which is based on dissipative particle dynamics, consists of different dynamical entities that represent the different characteristic time scales. Through the stress relaxation function, the mechanical properties of the model are investigated. For pure bitumen, the viscosity features super-Arrhenius behavior in the low-temperature regime in agreement with experimental data. The frequency-dependent viscoelastic properties show purely viscous behavior at low frequencies with increasing elasticity and hardening at higher frequencies, as expected. The model dynamics are analyzed in the framework of longitudinal hydrodynamics. The thermal process is two orders of magnitude slower than the attenuation of the density-wave propagation; hence the dynamic structure factor is dominated by a sharp Rayleigh peak and a relatively broad Brillouin peak. The model is applied to study triblock-copolymer-modified bitumen mixtures. Effects of the polymer concentration and end-block interactions with the bitumen are investigated. While the polymer concentration has an effect on the mechanical properties, the effect of increasing repulsive interactions between the bitumen and the polymer end-blocks is much more dramatic; it increases the viscosity of the mixture and shifts the onset of the elastic behavior to lower frequencies. For increased repulsion, the polymer end-blocks form small clusters that can be connected by a dynamic polymer backbone network. A simple Flory-Huggins analysis reveals the onset of segregation of the end-blocks in the bitumen mixture in agreement with the simulation data. Hence the changed mechanical properties are due to the emergence of large-scale structures as the repulsion is increased, which conforms to known mechanisms of microphase separation in polymer-modified bitumens.

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“…Inspired by Badami and Greenfield 40 and Hartkamp et al, 41 the stress relaxation is fitted to an extended Maxwell model of the form…”

Section: A Mechanical Propertiesmentioning

confidence: 99%

Section: A Mechanical Propertiesmentioning

confidence: 99%

Section: A Mechanical Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

ROSE bitumen: Mesoscopic model of bitumen and bituminous mixtures

Lemarchand

Greenfield

Dyre

et al. 2018

The Journal of Chemical Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…While the prevalent accepted models are analytical viscoelastic models consisting different physical elements, such as the generalized Maxwell model, the generalized Kelvin model and so on. Badami and Greenfield obtained the model parameters by using the discrete generalized Maxwell model based on fitting the dynamic modulus master curves and calculated the relaxation modulus by using the parameters afterwards [1]. The dynamic modulus, creep compliance and relaxation modulus of the generalized Maxwell model or the generalized Kelvin model can also be represented by the Prony series, and by using the Prony series these three viscoelastic functions can be interchangeable.…”

Section: Introductionmentioning

confidence: 99%