01090184

Component

https://doi.org/10.3141/2051-01

http://scholar.google.com...omas&publication_year=2008

An experiment involving three neat asphalts and their mixtures with 1.5 wt % of polyphosphoric acid (105%) was conducted to investigate the effect of polyphosphoric acid (PPA) on the long-term aging characteristics of asphalt binders. Analytical techniques including dynamic shear rheometry, Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry, and nuclear magnetic resonance (NMR) spectroscopy were performed on unaged and aged PPA-modified asphalts. Rheological properties of unaged and aged modified asphalts were measured with a dynamic shear rheometer at various temperatures. The concentration of carbonyl-containing compounds present in the various unmodified and PPA-modified binders was determined by FTIR spectrometry. The thermal properties of the unmodified and PPA-modified binder were obtained by using differential scanning calorimetry. The results indicate that PPA-modified asphalts reduce rutting potential by increasing initial stiffness and reduce fatigue or low temperature cracking, or both by improving the low-temperature flow properties. The correlation between rheological properties and chemical properties of unmodified and PPA-modified asphalts is also presented. The results show a linear relationship between physical properties and chemical properties of asphalt binders with respect to oxidative aging. However, addition of PPA to asphalt alters the linear relationship. NMR results showed no new chemical species formed in the asphalt–PPA mixture.

01111956

English

pp 1-7

2008

Transportation Research Record: Journal of the Transportation Research Board

9780309113236

Print

Figures (11) ; References (18)

Aging (Materials); Asphalt mixtures; Bituminous binders; Calorimeters; Cracking; Fatigue (Mechanics); Fourier transforms; Infrared spectroscopy; Nuclear magnetic resonance; Rutting; Stiffness; Thermal properties

Dynamic shear rheometry; Polyphosphoric acid

Highways; Materials; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Jan 29 2008 3:55PM

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• Evaluation of the Use of Reclaimed Asphalt Pavement in Stone Matrix Asphalt Mixtures
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• Mechanical and Performance-Related Properties of Asphalt Mixes Containing Expanded Clay Aggregate
• Mechanistic Properties of Hot-Mix Asphalt Mixtures Containing Hydrated Lime
• Using Warm-Mix Asphalt Technology to Incorporate High Percentage of Reclaimed Asphalt Pavement Material in Asphalt Mixtures
• Utilization of Biofuel Coproducts as Performance Enhancers in Asphalt Binder