01124832

Component

https://doi.org/10.3141/2126-17

http://scholar.google.com...spie&publication_year=2009

In 2007 the Virginia Department of Transportation (VDOT) decided to allow higher percentages—more than 20%—of recycled asphalt pavement (RAP) in hot-mix asphalt with no change in binder grade. For selected VDOT resurfacing projects in 2007, six contractors produced a total of 129,277 tons of mix containing 21% to 30% RAP from seven asphalt plants in four districts. This study estimated the effect of increased RAP percentages on performance and relative cost. Mixes from most of the high-RAP jobs were sampled and tested, as were mixes from roughly comparable jobs containing less than 20% RAP. Laboratory tests revealed no significant difference between the higher RAP mixes and the control mixes for fatigue, rutting, and susceptibility to moisture. Recovered binder was graded to determine the effect of adding higher percentages of RAP. No construction problems were attributed to the use of the mix with the higher RAP percentage. Slight price adjustments were applied to two of the 10 high-RAP projects, but these were not because of the higher RAP percentage. Price and quantity data from all contracts in the 2007 resurfacing schedule were subjected to statistical analysis. The specification allowing higher RAP percentages was found to have a small, statistically insignificant impact on the bid prices for surface mix items. Value engineering proposals received for jobs not advertised with the high-RAP specification showed that the use of more than 20% RAP could reduce costs in at least some cases.

01147489

09-3425

English

pp 142-150

2009

Transportation Research Record: Journal of the Transportation Research Board

9780309142564

Print

Figures (1) ; References (7) ; Tables (11)

Asphalt mixtures; Economic analysis; Fatigue (Mechanics); Hot mix asphalt; Mix design; Pavement performance; Recycled materials; Rutting; Value engineering

Moisture susceptibility

Virginia

Highways; Materials; Pavements; I23: Properties of Road Surfaces; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Jan 30 2009 7:49PM

• Application of Elastic–Viscoelastic Correspondence Principle to Determine Fatigue Endurance Limit of Hot-Mix Asphalt
• Asphalt Cement Loss Tangent as Surrogate Performance Indicator for Control of Thermal Cracking
• Characterizing Fatigue of Asphalt Binders with Viscoelastic Continuum Damage Mechanics
• Comparison of Asphalt Rubber and Conventional Mixture Properties: Considerations for Mechanistic–Empirical Pavement Design Guide Implementation
• Determining Intrinsic Healing Properties of Asphalt Binders: Role of Dynamic Shear Rheometer
• Effect of Crumb Rubber Bituminous Mixes on Functional Characteristics of Road Pavements
• Effects of Warm-Mix Asphalt Additives on Workability and Mechanical Properties of Reclaimed Asphalt Pavement Material
• Evaluation of Bond Strength of Tack Coat Materials in Field: Development of Pull-Off Test Device and Methodology
• Evaluation of Warm-Mix Asphalt Produced with the Double Barrel Green Process
• Field and Laboratory Forensic Analysis of Reflective Cracking on Massachusetts Interstate 495
• Investigation of Fiber-Modified Bituminous Mixes
• Laboratory and Field Evaluations of Foamed Warm-Mix Asphalt Projects
• Laboratory Investigation of Moisture Damage in Warm-Mix Asphalt Containing Moist Aggregate
• Modeling of Repeated Creep and Recovery Experiments in Asphalt Binders
• Performance of Polymer-Modified Asphalt Mixture with Reclaimed Asphalt Pavement
• Practical Use of Multiple Stress Creep and Recovery Test: Characterization of Styrene–Butadiene–Styrene Dispersion and Other Additives in Polymer-Modified Asphalt Binders
• Testing of Moderate and High Reclaimed Asphalt Pavement Content Mixes: Laboratory and Accelerated Field Performance Testing at the National Center for Asphalt Technology Test Track