01336782

Component

https://doi.org/10.3141/2207-11

http://scholar.google.com...rtin&publication_year=2011

Over the past 15 years, the use of polyphosphoric acid (PPA) in asphalt pavements has been increasing. Given this general time frame, many of these original asphalt pavements containing PPA will soon be rehabilitated and thereby produce recycled asphalt pavement (RAP) material containing PPA. With an industry driven by reducing material costs and promoting sustainability, the use of higher percentages of RAP is being pursued. This trend raises the question of the general recyclability of PPA-modified asphalt and whether it performs as well as conventional polymer-modified RAP when used in hot-mix asphalt. PPA-modified asphalt has been extensively studied in recent years, from its fundamental mechanisms to general field performance. However, research concerning the recyclability of PPA-modified asphalt has yet to be conducted. The present study evaluated the performance of asphalt mixtures modified with various percentages of laboratory-produced RAP. Laboratory aging procedures were used to produce RAP similar to RAP sampled from the field. Three asphalt binders were evaluated: styrene–butadiene–styrene (SBS) only, PPA-SBS, and PPA only. All three asphalt binders graded out to a PG 76-22. Test results indicated that at RAP percentages as high as 45%, all three RAP types resulted in similar performance with respect to permanent deformation, fatigue cracking, stiffness, and moisture damage susceptibility. The research effort concluded that RAP containing PPA is not detrimental to hot-mix asphalt and should perform in a similar manner to RAP containing SBS-modified asphalt.

01356126

11-2941

English

pp 79-88

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309167437

Print

Figures (7) ; References (13) ; Tables (3)

Asphalt mixtures; Fatigue cracking; Hot mix asphalt; Laboratory studies; Pavement performance; Recycled materials; Rutting; Stiffness; Styrene butadiene styrene

Modified asphalt; Moisture susceptibility; Polyphosphoric acid

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

TRIS, TRB, ATRI

Feb 17 2011 6:21PM

• Alternate Shift Factor Relationship for Describing Temperature Dependency of Viscoelastic Behavior of Asphalt Materials
• Coarse Aggregate Angularity and Its Relationship to Permanent Deformation of Gravel-Aggregate Hot-Mix Asphalt in New York State
• Comparative Field Performance of Asphalts from Multiple Crude Oil Sources
• Correlation of Moisture Loss and Strength Gain in Chip Seals
• Direct Measurements of Volatile and Semivolatile Organic Compounds from Hot- and Warm-Mix Asphalt
• Effect of PG XX-34 on Transverse Cracking in Minnesota
• Effects of Physical Hardening on Stress Relaxation in Asphalt Cements: Implications for Pavement Performance
• Evaluation of Nano–Titanium Dioxide Additive on Asphalt Binder Aging Properties
• Influence of Aging and Temperature on Intrinsic Healing of Asphalt Binders
• Modification and Validation of the Linear Amplitude Sweep Test for Binder Fatigue Specification
• New Low-Temperature Performance-Grading Method: Using 4-mm Parallel Plates on a Dynamic Shear Rheometer
• Oxidative Aging of Asphalt Binders in Hot-Mix Asphalt Mixtures
• Performance of Superpave Projects in Louisiana
• Pressure Aging Vessel and Low Temperature Properties of Asphalt Binders
• Separation of Thixotropy from Fatigue Process of Asphalt Binder