Flexural-Creep Stiffness of Asphalt Binders Measured by Simple Developed Apparatus

Warm asphalt has been gaining increasing popularity in recent years around the world due to many reasons including the energy reductions and environmental benefits. In the present study, the objective was to conduct a laboratory investigation of rheological properties of eight binders with four non-foaming warm mix asphalt (WMA) additives at intermediate and low performance temperatures in terms of Superpave low temperature test criteria. The conventional testing procedures such as dynamic shear rheometer (DSR), bending beam rheometer (BBR) test as well as specific Fourier transform infrared spectroscopy (FTIR) were performed to determine the influences of non-foaming additives on asphalt binders after a long-term aging procedure. The test results indicated that the binder type and source play key roles in determining the G*sin δ values of WMA binders with the non-foaming WMA additive. All eight binders containing Sasobit generally have higher creep stiffness values compared to the binders with other WMA additives. The FTIR tests illustrated that the absorbance of the C-O stretch and C-H bend regions of the WMA binders after a short and long-term aging procedure can be considered similar. Moreover, the WMA binders generally exhibit better performance properties than control binders at intermediate and low temperatures after a long-term aging procedure. Furthermore, FTIR analysis results indicate that the binder type and source play important roles in determining the rheological properties of WMA binders.

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Bitumen and bituminous binders. Determination of the flexural creep stiffness. Bending Beam Rheometer (BBR)

10.3403/30102527 ◽

2006 ◽

Cited By ~ 2

Keyword(s):

Bending Beam Rheometer ◽

Flexural Creep ◽

Creep Stiffness ◽

Bituminous Binders

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Investigation on the cooling medium effect in the characterization of asphalt binder with the bending beam rheometer (BBR)

Canadian Journal of Civil Engineering ◽

10.1139/cjce-2017-0586 ◽

2018 ◽

Vol 45 (7) ◽

pp. 594-604 ◽

Cited By ~ 4

Author(s):

Augusto Cannone Falchetto ◽

Ki Hoon Moon ◽

Di Wang ◽

Chiara Riccardi

Keyword(s):

Thermal Stress ◽

Asphalt Binder ◽

Asphalt Binders ◽

Medium Effect ◽

Bending Beam Rheometer ◽

Cooling Medium ◽

Performance Grade ◽

Creep Stiffness ◽

Critical Cracking Temperature ◽

Huet Model

In this paper, the possibility of using air as an alternative cooling medium for testing asphalt binder in the bending beam rheometer (BBR) is considered and evaluated. For this purpose, five asphalt binders were characterized with the BBR; creep stiffness, m-value, performance grade (PG), thermal stress, and critical cracking temperature were computed both for ethanol and air. In addition, the rheological Huet model was fitted to the experimental measurements to further investigate the effect of the cooling medium. It was found that air measurements result in stiffer materials, with higher low PG, higher thermal stress, and critical cracking temperature. The parameters of the Huet model confirm such a stiffening effect when air is used. Based on the material response observed in this study, further research is recommended before potentially replacing ethanol with air in the BBR, as the latter appears to provide a substantially different material grading.

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Test Method for Determining the Flexural Creep Stiffness of Asphalt Binder Using the Bending Beam Rheometer (BBR)

10.1520/d6648-08r16 ◽

2016 ◽

Cited By ~ 9

Author(s):

Keyword(s):

Asphalt Binder ◽

Test Method ◽

Bending Beam Rheometer ◽

Flexural Creep ◽

Creep Stiffness

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The Effects of Aging on Asphalt Binders Containing Visbreaking Residues

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.737.541 ◽

2017 ◽

Vol 737 ◽

pp. 541-546

Author(s):

Pavel Coufalik ◽

Ondrej Dasek ◽

Iva Krcmova ◽

Petr Hyzl

Keyword(s):

Low Temperature ◽

Shear Modulus ◽

Softening Point ◽

Laboratory Tests ◽

Asphalt Binders ◽

Complex Shear Modulus ◽

Needle Penetration ◽

Complex Shear ◽

Creep Stiffness ◽

Effects Of Aging

The quality and properties of asphalt binders are one of the most important factors that affect lifetime of asphalt roads. In refineries, visbreaking residues (VFCRs) are sometimes added to asphalt binders in variable ratios. VFCR addition can affect the overall properties of the manufactured binder, in particular resistance against aging. Using selected laboratory tests, this paper analyzes the effects of adding VFCRs to paving bitumens with a gradation of 160/220 on its properties (needle penetration, softening point, complex shear modulus and phase angle and creep stiffness and m-values). Also the effect of simulated aging of binders containing VFCRs on their properties has been tested. It was found that by increasing the VFCR content and the extent of aging, the binder stiffness increases. At higher VFCR ratios, the binder is more affected by aging at higher temperatures. Increased amount of VFCR also negatively affects low-temperature properties of the binder, which is related to its higher stiffness.

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