Bitumen and bituminous binders. Determination of zero-shear viscosity (ZSV) using a shear stress rheometer in creep mode

2015 ◽  
Keyword(s):  
Shear Stress ◽  
Shear Viscosity ◽  
Zero Shear Viscosity ◽  
Bituminous Binders

scholarly journals Study of the zero shear viscosity of SBS copolymer modified bitumens

2014 ◽  
Vol 13 (4) ◽  
pp. 251-258
Author(s):  
Mieczysław Słowik ◽  
Marta Andrzejczak
Keyword(s):  
Shear Stress ◽  
Constant Temperature ◽  
Shear Viscosity ◽  
Time Sequence ◽  
Crude Oils ◽  
Dynamic Shear ◽  
Modified Bitumen ◽  
Zero Shear Viscosity ◽  
Dynamic Shear Rheometer ◽  
Angular Deformation

The paper presents the results of the zero shear viscosity (ZSV) determined by using a dynamic shear rheometer (DSR). The tests were conducted with the use of 50/70 penetration grade bitumen produced from Venezuelan and Russian crude oils (named V50/70 and R50/70, respectively). Specimens of the tested polymer modified bitumens were combined with modified bitumen concentrate (containing 9% of SBS copolymer) by mixing them together. The objects of the tests were modified bitumens containing 1.5%; 3.0%; 4.5%; 6.0% and 9.0% of SBS copolymer. Zero shear viscosity (ZSV) was determined with the use of two methods: the creep method at various levels of shear stress in the time sequence and a method in which kinematic, sinusoidal angular deformation was applied. The tests were conducted at a constant temperature of 60˚C. The results of two ZSV tests gave similar findings for 50/70 penetration grade bitumen and modified bitumen with low SBS copolymer content (1.5%). In the case of modified bitumen with higher SBS copolymer content, i.e. 3%; 4.5%; 6%; 9%, zero shear viscosity determined by two methods gave different results.

USING STEADY SHEAR RATE SWEEP PROTOCOL TO DETERMINE ZERO SHEAR VISCOSITY OF UNAGED AND AGED UNMODIFIED BITUMINOUS BINDERS

2021 ◽  
Author(s):  
Syed Mubashirhussain ◽  
Venkaiah Chowdary
Keyword(s):  
Shear Rate ◽  
Shear Viscosity ◽  
Steady Shear ◽  
Zero Shear Viscosity ◽  
Shear Rates ◽  
Bituminous Mixtures ◽  
Bituminous Binders ◽  
Bituminous Pavements ◽  
Low Shear

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.

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

1996 ◽  
Vol 1535 (1) ◽  
pp. 15-21 ◽  
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.

New Absolute Molecular Weight Method—Linear High Polymers

1959 ◽  
Vol 32 (1) ◽  
pp. 97-98
Author(s):  
F. Bueche ◽  
S. W. Harding
Keyword(s):  
Molecular Weight ◽  
Shear Rate ◽  
Shear Viscosity ◽  
Rate Dependence ◽  
Zero Shear Viscosity ◽  
Molecular Weights ◽  
Weight Method ◽  
Shear Rate Dependence ◽  
High Polymers

Abstract It has been shown that the shear-rate dependence of the viscosity of concentrated polymer solutions can be explained in terms of known parameters of the solution. If the concentration, temperature, zero shear viscosity, and molecular weight of the polymer are known, the decrease in viscosity with increasing shear rate can be predicted. Conversely, if one measures the shear-rate dependence of the viscosity, the molecular weight may be computed. We believe this provides a convenient method for the absolute determination of molecular weights of linear, coiling, high polymers.

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