The Rheology of Asphalt. II. Flow Characteristics of Asphalt

Gaskins, Frederick H.; Brodnyan, John G.; Philippoff, W.; Thelen, Edmund

doi:10.1122/1.548857

Cited by 32 publications

(10 citation statements)

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“…The papers (21,22) give a sufficiently wide coverage of data on the activation energy of viscous flow of bitumens. An analysis of these data shows that the activation energy varies between 23 and 127 kcal/mole, depending on the temperature and the type of bitumen.…”

Section: Resultsmentioning

confidence: 99%

Viscoelastic properties of bitumens in continuous and cyclic deformation

1975

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Section: Resultsmentioning

confidence: 99%

Viscoelastic properties of bitumens in continuous and cyclic deformation

1975

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“…However, the published viscosity data do not in general extend below ~/0/5 in comparison to polymer characterization in which the range of shear rates is usually such that viscosity data cover at least a few decades [2,10]. Nevertheless a powerlaw behaviour, r/~ 9-', could fit the data of the various authors (n varying from 0.5 [4,11] to 0.6 [11,5,8].…”

Section: Hscoelastic Behaviour Of Asphaltsmentioning

confidence: 88%

Non-linear behaviour of asphalts in steady and transient shear flow

Attané¹,

Soucémarianadin²,

Turrel³

et al. 1984

Rheol Acta

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Steady-state and transient shear stress and normal stress data were obtained for four asphalts with a modified Weissenberg Rheogoniometer. Interest was specially related to non-linear behaviour at high shear-rates. The time-temperature superposition principle was found to hold in non-linear behaviour. Moreover, steady-state and transient data could be plotted as master curves irrespective of the nature of the asphalts. In particular, the master curve of steadystate viscosity could be extended to results published in the literature. In the nonlinear region the shear stress relaxation after cessation of a steady shear rate becomes a function of ~ t only and is related to the primary normal-stress coefficient, as predicted by the Yamamoto equation. In the shear stress growth experiment an overshoot is obtained at a constant strain close to 1.5, independent of the rate of strain.

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“…As a result, the viscosity of bitumen at the Ring & Ball softening temperature was initially thought to be an equiviscous temperature corresponding to a viscosity between 800 and 3000 Pa s [182], with an average value of 1200 Pa s [189]. Later work, based on more precise rheological testing, proposed instead a value of the apparent viscosity at the Ring & Ball softening temperature of 5000 Pa s, corresponding to an average shear stress of 15 kPa or an average rate of shear of 0.3 s − 1 [190].…”

Section: Ring and Ball Softening Temperaturementioning

confidence: 99%

“…Taking values for micelle size between 2 and 8 nm give calculated σ α ranging from 0.4 to 27 kPa, to be compared to the bitumen-dependent values in the same range measured by Dobson [198], to the almost constant value of 0.3 kPa observed for different materials by Gaskins [190], or to the typical value of 1 kPa found by Cheung [227]. This is reminiscent of the classical observations by Krieger, who highlighted a critical shear stress above which non-Newtonian effects showed up in the permanent flow of monodisperse lattices [213].…”

Section: Newtonian/viscoelastic Transition: α-Relaxationmentioning

confidence: 99%