Impact of High RAP Contents on Structural and Performance Properties ofAsphalt Mixtures

Currently, highway agencies in Illinois are exploring the feasibility of using higher amounts of reclaimed asphalt pavement (RAP) in asphalt mixtures. Concerns about variability in aggregate gradation and higher stiffness of aged RAP binder have limited this use, however. This research project was designed to characterize the performance of hot-mix asphalt (HMA) with high amounts of RAP and to identify any special considerations that must be met to utilize these higher RAP contents. Two material sources from two districts were used to prepare eight 3/4-in nominal maximum aggregate size (NMAS) N90 binder mix designs. The mix designs included a control mix with 0% RAP and three HMAs with 30%, 40%, and 50% RAP for each district. A base asphalt binder (PG 64-22) was used in the mix design process; a single-bumped binder (PG 58-22) and a double-bumped binder (PG 58-28) were also used to prepare specimens for performance testing. The tests conducted on the HMAs were moisture susceptibility, flow number, complex modulus, beam fatigue, semi-circular bending, and wheel tracking. All tested HMAs with RAP performed equal to or better than the mixtures prepared with virgin aggregate. The study found that HMAs with high RAP content (up to 50%) can be designed with desired volumetrics. RAP fractionation proved to be very effective. Asphalt binder-grade bumping is vital for HMAs with 30% RAP content and above.

[1]  Mary Stroup-Gardiner,et al.  Use of Reclaimed Asphalt Pavement in Superpave Hot-Mix Asphalt Applications , 1999 .

[2]  R M Anderson,et al.  Recommended use of reclaimed asphalt pavement in the Superpave mix design method: technician's manual. , 2000 .

[3]  Imad L. Al-Qadi,et al.  Determination of Usable Residual Asphalt Binder in RAP , 2009 .

[4]  Prithvi S. Kandhal,et al.  DESIGNING RECYCLED HOT MIX ASPHALT MIXTURES USING SUPERPAVE TECHNOLOGY , 1997 .

[5]  S. Esterby.  American Society for Testing and Materials , 2006 .

[6]  Prithvi S. Kandhal,et al.  PERFORMANCE OF RECYCLED HOT-MIX ASPHALT MIXTURES IN GEORGIA , 1995 .

[7]  Imad L. Al-Qadi,et al.  Investigation of Working Binder in Hot-Mix Asphalt Containing Recycled Asphalt Pavements , 2009 .

[8]  Paulo A. A. Pereira,et al.  Mechanical Characterisation of Hot Mix Recycled Materials , 2004 .

[9]  R. N. Jester.  Progress of superpave (superior performing asphalt pavement) : evaluation and implementation , 1997 .

[10]  Ulf Isacsson,et al.  Material-Related Aspects of Asphalt Recycling--State-of-the-Art , 2006 .

[11]  Kandiah Pratheepan.  Use of reclaimed asphalt pavements (RAP) in airfield HMA pavements , 2008 .

[12]  R M Anderson,et al.  Laboratory mix design using RAP: determining aggregate properties , 2004 .

[13]  Serji N. Amirkhanian,et al.  Recyclability of moisture damaged flexible pavements , 1993 .

[14]  Andrew Drescher,et al.  INVESTIGATION OF RECYCLED ASPHALT PAVEMENT (RAP) MIXTURES , 2002 .

[15]  K. K.,et al.  Five-Year Experience of Low-Temperature Performance of Recycled Hot Mix , 2022 .

[16]  Xiang Shu,et al.  Laboratory evaluation of fatigue characteristics of recycled asphalt mixture , 2008 .

[17]  Sungho Kim,et al.  Performance of Polymer-Modified Asphalt Mixture with Reclaimed Asphalt Pavement , 2009 .

[18]  Jo Sias Daniel,et al.  Mechanistic and Volumetric Properties of Asphalt Mixtures with RAP , 2005 .

[19]  Samuel H Carpenter.  Fatigue Performance Of Idot Mixtures , 2006 .

[20]  Mary Stroup-Gardiner,et al.  Indirect Tension Relaxation Test to Evaluate the Effect of the Addition of RAP to HMA Mixes , 2007 .

[21]  Ghassan R. Chehab,et al.  Evaluating RAP Mixtures using the Mechanistic Empirical Pavement Design Guide Level 3 Analysis , 2006 .

[22]  I Widyatmoko.  Mechanistic-empirical mixture design for hot mix asphalt pavement recycling , 2008 .

[23]  G. Huber,et al.  Investigation of Properties of Plant-Produced Reclaimed Asphalt Pavement Mixtures , 2007 .

[24]  J A Epps,et al.  Mixture Properties of Recycled Central Plant Materials , 1978 .

[25]  R S McDaniel,et al.  USE OF RECLAIMED ASPHALT PAVEMENT (RAP) UNDER SUPERPAVE SPECIFICATIONS (WITH DISCUSSION) , 2003 .

[26]  M. Marasteanu,et al.  Effect of Reclaimed Asphalt Pavement (Proportion and Type) and Binder Grade on Asphalt Mixtures , 2008 .

[27]  R. Lyman Ott.,et al.  An introduction to statistical methods and data analysis , 1977 .

[28]  Mansour Solaimanian,et al.  VARIABILITY ANALYSIS OF HOT-MIX ASPHALT CONCRETE CONTAINING HIGH PERCENTAGE OF RECLAIMED ASPHALT PAVEMENT , 1996 .

[29]  Prithvi S. Kandhal,et al.  Hot Mix Asphalt Materials, Mixture Design and Construction , 1996 .