Complex shear modulus and phase angle of crumb rubber modified binders containing organic warm mix asphalt additives

In order to study the performance of Sasobit warm mix asphalt and the influence of aging, complex shear modulus G* and phase angle δ of Sasobit warm mix asphalt are tested by Dynamic Shear Rheometer （DSR） at different aging phase, to analyze the effects of Sasobit to the performance and the aging of 70# and SBS asphalt. The results show that with the increasing of the dosage of Sasobit, the value of G*/sinδ can be increased at different aging phase, the change in the phase angle has the same trend; the degree of Long-term aging of warm-matrix asphalt is larger than modified asphalt's. This may be related to the interaction of Sasobit and modifier.

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Bitumen and bituminous binders. Determination of complex shear modulus and phase angle. Dynamic Shear Rheometer (DSR)

10.3403/30247874 ◽

2012 ◽

Cited By ~ 3

Keyword(s):

Shear Modulus ◽

Phase Angle ◽

Dynamic Shear ◽

Complex Shear Modulus ◽

Dynamic Shear Rheometer ◽

Complex Shear ◽

Bituminous Binders

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Artificial Intelligence Prediction of Rutting and Fatigue Parameters in Modified Asphalt Binders

Applied Sciences ◽

10.3390/app10217764 ◽

2020 ◽

Vol 10 (21) ◽

pp. 7764

Author(s):

Ikenna D. Uwanuakwa ◽

Shaban Ismael Albrka Ali ◽

Mohd Rosli Mohd Hasan ◽

Pinar Akpinar ◽

Ashiru Sani ◽

...

Keyword(s):

Shear Modulus ◽

Predictive Model ◽

Phase Angle ◽

Asphalt Binder ◽

Fatigue Cracking ◽

Support Vector ◽

Complex Shear Modulus ◽

Tropical Regions ◽

Pavement Distress ◽

Complex Shear

The complex shear modulus (G*) and phase angle (δ) are fundamental viscoelastic rheological properties used in the estimation of rutting and fatigue pavement distress in asphalt binder. In the tropical regions, rutting and fatigue cracking are major pavement distress affecting the serviceability of road infrastructure. Laboratory testing of the complex shear modulus and phase angle requires expensive and advanced equipment that is not obtainable in major laboratories within the developing countries of the region, giving rise to the need for an accurate predictive model to support quality pavement design. This research aims at developing a predictive model for the estimation of rutting and fatigue susceptive of asphalt binder at intermediate and high pavement temperatures. Asphalt rheological and ageing test was conducted on eight mixes of modified binders used to build the study database containing 1976 and 1668 data points for rutting and fatigue parameters respectively. The database was divided into training and simulation dataset. The Gaussian process regression (GPR) algorithm was used to predict the rutting and fatigue parameters using unaged and aged conditioned inputs. The proposed GPR was compared with the support vector machine (SVM), recurrent neural networks (RNN) and artificial neural network (ANN) models. Results show that the model performed better in the estimation of rutting parameter than the fatigue parameter. Further, unaged input variables show better reliability in the prediction of fatigue parameter.

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Methods of test for petroleum and its products. Bitumen and bituminous binders. Determination of complex shear modulus and phase angle. Dynamic Shear Rheometer (DSR)

10.3403/30102524u ◽

2015 ◽

Keyword(s):

Shear Modulus ◽

Phase Angle ◽

Dynamic Shear ◽

Complex Shear Modulus ◽

Dynamic Shear Rheometer ◽

Complex Shear ◽

Bituminous Binders

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Construction of complex shear modulus and phase angle master curves for aging asphalt binders

International Journal of Pavement Engineering ◽

10.1080/10298436.2020.1758934 ◽

2020 ◽

pp. 1-9

Author(s):

Fang Liu ◽

Zhidong Zhou ◽

Xiao Zhang

Keyword(s):

Shear Modulus ◽

Phase Angle ◽

Asphalt Binders ◽

Master Curves ◽

Complex Shear Modulus ◽

Complex Shear

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Evaluation of Rheological Characteristics of Graphite Modified Bitumen

Journal of Civil Engineering and Urbanism ◽

10.54203/jceu.2021.7 ◽

2021 ◽

Vol 11 ◽

pp. 51-57

Author(s):

Odunayo Olayemi Oladunjoye ◽

Olugbenga Joseph Oyedepo ◽

Ebenezer Omoniyi Olukanni ◽

Sombo Philiph Akande

Keyword(s):

Shear Modulus ◽

Phase Angle ◽

Dynamic Viscosity ◽

Loss Modulus ◽

Rheological Parameters ◽

Dynamic Shear ◽

Complex Shear Modulus ◽

Modified Bitumen ◽

Dynamic Shear Rheometer ◽

Complex Shear

The level of performance of asphalt concrete has a close relationship with the properties of bitumen used. This research evaluates the rheological parameters of graphite modified bitumen. Index properties tests were conducted on bitumen and graphite to determine their suitability. Dynamic viscosity and dynamic shear rheometer were conducted on bituminous binder modified with four different proportion of graphite ranging from 2% to 10% by bitumen weight. Dynamic viscosity test was conducted on bitumen and graphite modified bitumen at temperature of 1350C and 1650C using Brookfield Viscometer. The rheological properties are centered on phase angle (δ) and complex shear modulus (G*) which were determined on bitumen and graphite modified bitumen at temperature ranging from 520C – 700C at 10 rad/s frequency using Dynamic Shear Rheometer in accordance with ASTM D7175-15. The storage modulus (G'), loss modulus (G") and rutting parameters were then evaluated from phase angle and complex shear modulus. The bitumen and graphite modified bitumen showed that graphite modified bitumen has the highest complex shear modulus and rutting parameter of 8984 (kPa) and 33387 (kPa) at 10% graphite content. The results of viscosity helped to determine the mixing and compaction temperatures. Dynamic shear rheometer test results determined the elastic and viscous behaviour at various temperature. The higher the complex shear modulus and rutting parameter the stiffer the binder will resist deformation and rutting.

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