01444770

Component

http://www.trb.org/Main/Blurbs/167701.aspx

http://www.trb.org/Publications/Blurbs/167701.aspx

The environmental awareness and aging of the U.S. infrastructure call for alternative materials to modify or replace asphalt binders. There is a concern about the effect of modifiers on the binder susceptibility to oxidative age hardening. Coffee beans have been recognized for the antioxidant properties of their chlorogenic and caffeic acid components. Therefore this study has been initiated to investigate the effect of coffee bean modification on the rheology and aging properties of asphalt binder. The experimental protocol included mixing PG 64-22 neat binder with 2 to 8 wt% of either ground dry coffee beans or waste coffee grounds. The dynamic shear rheometer (DSR) was utilized to analyze temperature susceptibility of laboratory-aged neat and coffee-modified binders, whereas the attenuated total reflection Fourier transform infrared (FTIR) spectrometer was employed to track chemical changes in the coffee-modified binder samples subjected to standard Superpave laboratory aging procedures. Preliminary results indicated that waste coffee grounds practically do not change temperature susceptibility of base binder. However, the oxidation rate of coffee-modified binders increases with an increase in concentration of waste coffee grounds after either short-term or long-term aging but does not exceed the oxidation rate of a base binder. It is concluded that coffee beans added to considered asphalt binder served as a solvent rather than as an antioxidant.

01444762

English

pp 61-72

2012-8

Transportation Research Circular

Alternative Binders for Sustainable Asphalt Pavements

Web

Figures; Photos; References

Aging (Materials); Asphalt hardening; Bituminous binders; Rheological properties; Waste products (Materials)

Asphalt modifiers; Coffee; Oxidative hardening

Highways; Materials; Pavements; I31: Bituminous Binders and Materials; I35: Miscellaneous Materials

TRIS, TRB

Aug 30 2012 3:46PM

• Alternative Binder from Microalgae: Algoroute Project
• Alternative Binders for Sustainable Asphalt Pavements: Papers from a Workshop. Workshop Introduction
• Considerations for Use of Alternative Binders in Asphalt Pavements: Material Characteristics
• Development of Rubber-Modified Fractionated Bio-Oil for Use as Noncrude Petroleum Binder in Flexible Pavements
• Laboratory Evaluation of Waste Cooking Oil–Based Bioasphalt as Sustainable Binder for Hot-Mix Asphalt
• Organo Montmorillonite Nanoclay: Alternative Modifier to Sustain Durability of Asphalt Pavement
• Soy Fatty Acids as Sustainable Modifier for Asphalt Binders