Rheological characterization of asphalt binders used in strain relief asphalt mixtures (SRAM)1

El uso de capas intermedias que toleren los altos esfuerzos de tensión y cortantes que existen alrededor de las grietas de pavimentos deteriorados se ha constituido en una solución interesante para prevenir la reflexión de grietas. Avances recientes en la tecnología de polímeros han generado ligantes que pueden ser usados para producir mezclas para capas intermedias con buenas propiedades mecánicas. En este estudio, dos asfaltos modificados con polímeros fueron evaluados, ambos empleados en la producción de mezclas asfálticas de alivio de deformaciones usadas como capas intermedias en campo. La caracterización de los ligantes se presentó en dos grupos: (i) los ensayos empíricos requeridos por la especificación brasilera, y (ii) las propiedades reológicas (barrido de frecuencia/temperatura y ensayos MSCR). Los resultados mostraron que el ligante asfáltico usado para las mezclas asfálticas de alivio de deformaciones presentó propiedades reológicas considerablemente diferentes, a pesar de que su caracterización a través de ensayos empíricos es similar. Los parámetros G*/sinδ y MSCR (Jnr y porcentaje de recuperación) lograron diferenciar los ligantes asfálticos, aunque los parámetros del MSCR mostraron mayor sensibilidad.

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A Dynamic Semi-Circular Bending Configuration for the Rheological Characterization of Asphalt Mixtures

Journal of Civil Engineering and Construction ◽

10.32732/jcec.2020.9.3.150 ◽

2020 ◽

Vol 9 (3) ◽

pp. 150-164

Author(s):

Marina Cauhape Casaux ◽

Silvia Angelone ◽

Fernando Martinez

Keyword(s):

Rheological Properties ◽

Phase Angle ◽

Dynamic Modulus ◽

Plane Surface ◽

Poisson Ratio ◽

Asphalt Mixtures ◽

Rheological Characterization ◽

State Of Stress ◽

Dynamic Loading Conditions

Many experimental procedures have been proposed for the determination of the rheological properties of asphalt mixtures. Among them, the indirect tensile test (ITT) has gained a lot of attention because of its relative simplicity and advantages. However, a biaxial state of stress is developed into the sample and then, the Poisson ratio must be estimated or measured for the calculations of the dynamic modulus. Looking for a testing configuration with the same simplicity and advantages, this paper proposes the Semi-Circular Bending (SCB) geometry with dynamic loading conditions in order to characterize the rheological properties (dynamic modulus and phase angle) of asphalt mixtures. Samples compacted in the laboratory or cored from in-service pavements can be used. A uniaxial state of stress is developed in the lower plane surface of the sample doing negligible the influence of the Poisson ratio on the dynamic modulus calculations. A specific experimental configuration was adopted and a 2D-FEM model has been used for the development of an equation for the calculation of the dynamic modulus. Two different asphalt mixtures were tested at diverse testing temperatures and loading frequencies. The obtained results have been analyzed and compared with those acquired with the more conventional testing configuration in uniaxial compression. An excellent agreement has been found for either the dynamic modulus or the phase angle with both sets of results. It could be concluded that the SCB configuration has been validated as a simple and promising methodology for the characterization of the viscoelastic response of asphalt mixtures.

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Rheological Characterization of Asphalt Binders and Mixtures Modified with Carbon Nanotubes

RILEM Bookseries - 8th RILEM International Symposium on Testing and Characterization of Sustainable and Innovative Bituminous Materials ◽

10.1007/978-94-017-7342-3_12 ◽

2015 ◽

pp. 141-150 ◽

Cited By ~ 2

Author(s):

Haopeng Wang ◽

Jun Yang ◽

Minghui Gong

Keyword(s):

Carbon Nanotubes ◽

Asphalt Binders ◽

Rheological Characterization

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Physical and Rheological Characterization of Waste Engine Oil in Aged Asphalt Binder

Journal of Computational and Theoretical Nanoscience ◽

10.1166/jctn.2020.8765 ◽

2020 ◽

Vol 17 (2) ◽

pp. 1040-1043 ◽

Cited By ~ 1

Author(s):

Nur Shahira Samsuri ◽

Norhidayah Abdul Hassan ◽

Nurul Hidayah Mohd Kamaruddin ◽

Mohd Rosli Hainin ◽

Mohd Ezree Abdullah ◽

...

Keyword(s):

Softening Point ◽

Asphalt Binder ◽

Engine Oil ◽

Asphalt Binders ◽

Rheological Characterization ◽

Heavy Machinery ◽

Waste Engine Oil ◽

Aged Asphalt ◽

Aged Binder

This research examines the impacts of adding various source and percentages of waste engine oil (WEO) on the physical and rheological characteristics of asphalt binder comprising aged asphalt binder. A base asphalt binder with penetration grade of 80/100 and aged binder were blended with three sources of WEO at 0%, 5%, 10%, 15%, and 20% by the weight of asphalt binder. These oils were collected from light vehicle (motorcycle), heavy vehicle (lorry), and heavy machinery (tractor). Penetration and softening point procedures were done to define the physical properties of the unmodified and modified asphalt binders. Meanwhile, the rheological property was evaluated with a dynamic shear rheometer (DSR). The results show that the high percentages of WEO increased the penetration and decreased the softening point. The addition of 15% and 20% of WEO especially from heavy machinery reduced the rutting resistance. Therefore, it is recommended that the modification of aged binder with these types of WEO should be up to 10%.

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