The effect of fly ash on the rheological properties of bituminous materials

The effect of fly ash on the rheological properties of bituminous materials

•Incorporation of fly ash into asphalt provided the crack-arresting effect at low temperatures.•The use of fly ash improved the rheological response of the asphalt binders.•The use of fly ash enabled binder grade increase to the levels achieved with polymer modification.•The improved rutting resista...

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Bibliographic Details
Published in:Fuel (Guildford) Vol. 116; pp. 471 - 477
Main Authors: Sobolev, Konstantin, Flores Vivian, Ismael, Saha, Rajan, Wasiuddin (Wasi), Nazimuddin M., Saltibus, Nibert E.
Format: Journal Article
Language:English
Published: Kidlington Elsevier Ltd 01-01-2014
Elsevier
Subjects:
Applied sciences
Asphalt
Bitumen
Dynamic viscosity
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fly ash
Fuels
Rutting factor
Rutting factor
Fly ash
Asphalt
Dynamic viscosity
Bitumen
Costs
Mixing
Shear
Pavement
Replacement
Binders
Cement
Concrete
Cost analysis
Performance
Rheological properties
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Summary:•Incorporation of fly ash into asphalt provided the crack-arresting effect at low temperatures.•The use of fly ash improved the rheological response of the asphalt binders.•The use of fly ash enabled binder grade increase to the levels achieved with polymer modification.•The improved rutting resistance of hot-mix asphalt with 5–60% of fly ash is expected. Fly ash has been effectively used in concrete; however, there are limited applications in which fly ash has been used in asphalt pavements. The reported research demonstrates that the use of fly ash in bitumen materials is an attractive option because it improves performance and reduces costs and environmental impacts. Microstructural investigation demonstrated that the crack-arresting was induced by the fly ash particles evenly distributed within bitumen matrix. To assess the effect of fly ash on the rheological performance of asphalt cement, a dynamic shear rheometer was used to measure the binder’s resistance to shear deformation in the linear viscoelastic region. The rutting factor, G*/sin(δ) and dynamic viscosity, η′, were determined for different types of bitumen at different temperatures, with 5%, 15%, 30% and 60% of binder replacement by weight of fly ash class C and F. The addition of fly ash improved the rutting factor and reached a higher performance grade of the binders. The viscosity for both bitumen types increased at 124°C degrees, but for the most of the compositions it remained within the range for mixing and placement of asphalt concrete.
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content type line 23
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2013.07.123