The Effects of Aging on Asphalt Binders Containing Visbreaking Residues

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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EFFECT OF VISCOELASTIC BEHAVIOR OF CELLULOSE OIL PALM FIBER (COPF) MODIFIED 60-70 ASPHALT BINDER FOR DETERIORATION FOR ROADS AND HIGHWAYS

Jurnal Teknologi ◽

10.11113/jt.v75.5294 ◽

2015 ◽

Vol 75 (11) ◽

Author(s):

Md. Maniruzzaman A. Aziz ◽

Ahmed Wsoo Hamad ◽

Abdulmalik Musa Maleka ◽

Fauzan Mohd Jakarni

Keyword(s):

Shear Modulus ◽

Oil Palm ◽

Softening Point ◽

Asphalt Binder ◽

Viscoelastic Behavior ◽

Complex Shear Modulus ◽

Palm Fiber ◽

Modified Asphalt ◽

Complex Shear ◽

Modified Asphalt Binder

This paper dealt with the viscoelastic behavior of Cellulose Oil Palm Fiber (COPF) modified 60-70 penetration grade asphalt binder for the deterioration of roads. The main objective of this study was to investigate the effect of various COPF contents on the physical and the rheological properties of penetration grade 60-70 asphalt binder. Laboratory tests performed comprised of viscosity, penetration, softening point, short & long term ageing, as well as complex shear modulus (G*). The COPF was blended in 0.2, 0.4, 0.6, 0.8, and 1.0% by weight of asphalt binder, including 0% as control. The COPF modified asphalt binder showed an increasing viscosity and softening point with the increase of COPF content, whereas the penetration decreased as the COPF was increased for the binder. The complex shear modulus (G*), rutting factor (G*/sin δ), and fatigue factor (G*sin δ) showed significant improvement for the modified samples compared to the unmodified samples. The results indicated that the COPF modified asphalt binder had high potential to resist permanent (rutting) deformation and fatigue cracking than the unmodified sample.

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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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The Analysis of Recovery Asphalt Performance in Recycled Asphalt Mixture

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.361-363.1598 ◽

2013 ◽

Vol 361-363 ◽

pp. 1598-1603

Author(s):

Hong Juan Wu ◽

Xin Yu Zhang

Keyword(s):

Chemical Composition ◽

Shear Modulus ◽

Softening Point ◽

Asphalt Mixture ◽

Combustion Method ◽

Gansu Province ◽

Complex Shear Modulus ◽

Recycled Asphalt ◽

Complex Shear ◽

Asphalt Performance

A laboratory study was carried to investigate the recycled asphalt performance of recycled asphalt mixture. The recycled asphalt mixture is from the Guaxing road in Gansu Province. By extraction tests and combustion method test on recycled asphalt mixture, the content of recovery asphalt, penetration, softening point and ductility were measured. The chemical composition testing and rheological testing were conducted on the recovery asphalt and new asphalt. Results indicate that the recovery asphalt contain the high proportion of asphaltenes and the low proportion of aromatics and resins. With temperature increasing, the decrease in the complex shear modulus (G*) of the recovery asphalt is much larger than that of the new asphalt,the increase in the phase angle of the recovery asphalt is much larger than that of the new asphalt, too. All these lead to the recovery asphalt harden, poor liquidity and plasticity.

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Viscoelastic Analysis of Asphalt Mastic Based on Micromechanics

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.266.38 ◽

2011 ◽

Vol 266 ◽

pp. 38-41

Author(s):

Jiu Peng Zhang ◽

Li Xu ◽

Jian Zhong Pei

Keyword(s):

Shear Modulus ◽

Chemical Interaction ◽

Hydrated Lime ◽

Asphalt Binders ◽

Dynamic Shear Modulus ◽

Dynamic Shear ◽

Complex Shear Modulus ◽

Asphalt Mastic ◽

Physico Chemical ◽

Complex Shear

In this study, the stiffening effect of fillers on asphalt binders was characterized through micromechanics and rheology methods. The dynamic shear rheometer (DSR) was used to measure viscoelastic properties of asphalt mastic. Mechanical volume filling effects and additional interacting mechanisms within mastic systems are discussed on the basis of micromechanics-rheology model to predict the complex shear modulus of asphalt mastic from the measured mastic data. It is observed that the phase angle ranges from 88.8o to 89.0o, does not significantly change due to limestone fillers addition. The analytical model prediction of complex shear modulus based on the dynamic shear modulus can be used. Using the nonlinear regression, the Einstein coefficient KE is 4.22, 5.09 and 7.44 for asphalt mixed with limestone, cement and hydrated lime, respectively. Beside, the SEM results explain why the mastic system with hydrated lime shows the highest KE. The behavior of hydrated lime fillers filled mastics is probably due to physico–chemical interaction, which can be validated by further research.

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