Practical test methods for measuring the zero shear viscosity of bituminous binders

Rutting is one of the most significant distresses occurring in bituminous pavements at higher pavement temperatures. Researchers have been focusing on developing bitumen binder parameters that can be used to predict the rutting resistance of bituminous mixtures and Zero Shear Viscosity (ZSV) has proven its efficacy as a binder rutting parameter. A stepwise steady shear rate sweep test with two cycles of forward and backward sweeps was conducted at very low shear rates to determine the ZSV of unaged, short-term aged, and long-term aged unmodified bitumen binders. A convergence of the steady-state viscosities was observed at different shear rates in the first forward sweep. The response of the binders was independent of shear rate, time and the effect of shear history was negligible. As the shear rates correspond to the ZSV regime, ZSV was determined from the first forward sweep. The ZSV correlated well with the three existing rutting parameters.

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Zero-Shear Viscosity of Bituminous Binder and Its Relation to Bituminous Mixture's Rutting Resistance

Transportation Research Record Journal of the Transportation Research Board ◽

10.1177/0361198196153500103 ◽

1996 ◽

Vol 1535 (1) ◽

pp. 15-21 ◽

Cited By ~ 35

Author(s):

Dariusz Sybilski

Keyword(s):

Shear Viscosity ◽

Close Correlation ◽

Equation Modeling ◽

Zero Shear Viscosity ◽

Rotational Viscometer ◽

Cross Model ◽

Rutting Resistance ◽

Before And After ◽

Bituminous Binders ◽

Newtonian Behavior

When testing viscosity of polymer-bitumen systems a question arises about interpretation of results as those systems behave as non-Newtonian liquids. A simple equation modeling non-Newtonian behavior of polymer-bitumens was proposed (which is a simplified version of the CROSS model). The equation used enables the calculation of zero-shear viscosity η0 from viscosity measurements conducted under various shear conditions, that is, with rotational viscometer at different shear rates (stresses). Test results are presented of several polymer-modified bituminous binders before and after Thin film oven test aging and discussion of non-Newtonian behavior. The wheel tracking test (Laboratoric Central des Ponts et Chaussées) was conducted for asphalt concrete with several bituminous binders, either plain bitumens or polymer modified. To estimate bituminous mixture's rutting resistance, a new relationship has been proposed to calculate N10 (wheel passes number to rut depth 10 mm). Close correlation was found between N10 and zero-shear (or absolute) viscosity of binders at 60°C, both conventional and polymer modified.

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Zero shear viscosity evaluation of PMB bituminous binders with different levels of polymer modifications

Pavement and Asset Management ◽

10.1201/9780429264702-68 ◽

2019 ◽

pp. 567-574

Author(s):

M. Agostinacchio ◽

D. Ciampa ◽

S. Olita

Keyword(s):

Shear Viscosity ◽

Zero Shear Viscosity ◽

Bituminous Binders ◽

Different Levels

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Prediction of Zero-Shear Viscosity of Linear Polybutadienes from the Crossover Point Using Doi-Edwards Theory

Rubber Chemistry and Technology ◽

10.5254/1.3536220 ◽

1988 ◽

Vol 61 (5) ◽

pp. 812-827 ◽

Cited By ~ 6

Author(s):

Ramesh R. Rahalkar ◽

Henry Tang

Keyword(s):

Shear Viscosity ◽

Amorphous Polymers ◽

Simple Expression ◽

Crossover Frequency ◽

Crossover Point ◽

Zero Shear Viscosity ◽

Plateau Modulus ◽

Good Agreement

Abstract Based upon the Doi-Edwards theory, a simple expression has been obtained for zero-shear viscosity in terms of the plateau modulus and the crossover frequency. There are no adjustable parameters in the expression. The model is in very good agreement with the zero-shear viscosity values for linear polybutadienes, the typical discrepancy being ∼5–10%. If the model can be validated for other linear amorphous polymers, it may become possible to estimate the zero-shear viscosity by measuring a single Theological parameter (the crossover frequency).

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Impact of Graphene Oxide on Zero Shear Viscosity, Fatigue Life and Low-Temperature Properties of Asphalt Binder

Materials ◽

10.3390/ma14113073 ◽

2021 ◽

Vol 14 (11) ◽

pp. 3073

Author(s):

Abbas Mukhtar Adnan ◽

Chaofeng Lü ◽

Xue Luo ◽

Jinchang Wang

Keyword(s):

Graphene Oxide ◽

Fatigue Life ◽

Low Temperature ◽

Shear Viscosity ◽

Storage Stability ◽

Asphalt Binder ◽

Asphalt Binders ◽

Test Results ◽

Zero Shear Viscosity ◽

Modified Asphalt

This study has investigated the impact of graphene oxide (GO) in enhancing the performance properties of an asphalt binder. The control asphalt binder (60/70 PEN) was blended with GO in contents of 0%, 0.5%, 1%, 1.5%, 2%, and 2.5%. The permanent deformation behavior of the modified asphalt binders was evaluated based on the zero shear viscosity (ZSV) parameter through a steady shear test approach. Superpave fatigue test and the linear amplitude sweep (LAS) method were used to evaluate the fatigue behavior of the binders. A bending beam rheometer (BBR) test was conducted to evaluate the low-temperature cracking behavior. Furthermore, the storage stability of the binders was investigated using a separation test. The results of the ZSV test showed that GO considerably enhanced the steady shear viscosity and ZSV value, showing a significant contribution of the GO to the deformation resistance; moreover, GO modification changed the asphalt binder’s behavior from Newtonian to shear-thinning flow. A notable improvement in fatigue life was observed with the addition of GO to the binder based on the LAS test results and Superpave fatigue parameter. The BBR test results revealed that compared to the control asphalt, the GO-modified binders showed lower creep stiffness (S) and higher creep rate (m-value), indicating increased cracking resistance at low temperatures. Finally, the GO-modified asphalt binders exhibited good storage stability under high temperatures.

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