The plastics and asphalt pavement industries have shown increasing interest in recycling waste plastics in asphalt because of potential environmental benefits. One approach to incorporating recycled plastics in asphalt is the wet process, which requires mechanical blending of recycled plastics into the asphalt binder as polymer modifiers. This study was aimed at exploring the use of recycled polyethylene (rPE) and a reactive elastomeric terpolymer (RET), which was used as a potential compatibilizer to rPE, for asphalt modification. Moreover, the study evaluated the impact of both modifiers on the bond strength characteristics of asphalt-aggregate systems as well as on the rutting and cracking resistance of asphalt mixtures. To this end, a battery of laboratory performance tests was conducted on asphalt mixtures containing binders: one neat; two rPE modified; and one styrene-butadiene-styrene modified. One rPE modified binder was formulated by adding 3% rPE to a PG 58-28 neat binder, while the other was modified with 3% rPE, RET, and polyphosphoric acid. Test results indicated that the rPE-plus-RET modified binder yielded an asphalt-aggregate system with enhanced moisture resistance, before and after oxidative aging. When compared with the control mixture, using rPE alone or rPE plus RET for asphalt modification significantly improved the rutting resistance. However, the rPE and rPE-plus-RET modified mixtures were found to be more susceptible to intermediate-temperature fatigue cracking at both short-term and long-term aging conditions. Finally, adding rPE or rPE plus RET did not have a significant impact on the mixture reflective cracking and thermal cracking resistance after long-term aging.
National Center for Asphalt Technology. Research Needed on Using Recycled Plastics in Asphalt. Asphalt Technology News. Fall 2019, Vol. 31, No. 2.
5.
Indian Roads Congress. Guidelines for the Use of Waste Plastics in Hot Bituminous Mixes (Dry Mixes) in Wearing Courses. IRC, 2013.
6.
BajpaiR.KhanM. A.SamiO. B.YadavP. K.SrivastavaP. K.A Study on the Plastic Waste Treatment Methods for Road Construction. International Journal of Advance Research, Ideas and Innovations in Technology, Vol. 3, No. 6, 559–566, 2017.
MacRebur, The Plastic Road Company. It’s the end for the road for waste plastics. https://www.macrebur.com/. Accessed July 21, 2019.
9.
WhiteG.ReidG.Recycled Waste Plastics for Extending and Modifying Asphalt Binders. Proc., 8th Symposium on Pavement Surface Characteristics: SURF 2018 – Vehicle to Road Connectivity, Brisbane, Queensland, 2018.
10.
BrownH.DuboisC. J.SerratC.Elvaloy® RET and Post-Consumer Recycled Resins for Performance Graded Asphalts. Washington, DC: Plastics Industry Association NEMO Meeting, 2019.
HoS.ChurchR.KlassenK.LawB.MacLeodD.ZanzottoL.Study of Recycled Polyethylene Materials as Asphalt Modifiers. Canadian Journal of Civil Engineering, Vol. 33, 2006, pp. 968–981.
13.
LiaoL.LiH.WangG.Research of Mixed-Waste Plastics from Urban Waste as Road Bitumen Modifier. China Resources Comprehensive Utilization, Vol. 24, No. 9, 2006, pp. 28–32.
14.
YangX.LiuK.Reflections on Waste Plastic Modified Asphalt Research. Journal of Tibet University, Vol. 25, No. 1, 2010, pp. 68–75.
15.
GawandeA.ZamreG. S.RengeV. C.BharsakaleG. R.TaydeS. (2012). Utilization of Waste Plastic in Asphalting of Roads. Scientific Reviews & Chemical Communications, Vol. 2, No. 2, 2012, pp. 147–157.
16.
SilvaH.OliveiraJ.FernandesS.Incorporation of Waste Plastic in Asphalt Binders to Improve Their Performance in the Pavement. International Journal of Pavement Research and Technology, Vol. 6, No. 4, 2013, pp. 457–464.
17.
AppiahJ. K.Berko-BoatengV. N.TagborT. A.Use of Waste Plastic Materials for Road Construction in Ghana. Case Studies in Construction Materials, Vol. 6, 2017, pp. 1–7.
18.
PlancheJ. P.ElwardanyM. D.AdamsJ. J.Chemo-mechanical Characterization of Bitumen Binders with the Same Continuous PG–Grade. Proc., RILEM 252-CMB-Symposium on Chemo Mechanical Characterization of Bituminous Materials, Springer, Cham, 2018, pp. 77–83.
AdamsJ. J.ElwardanyM. D.PlancheJ. P.BoysenR. B.RovaniJ.Diagnostic Techniques for Various Asphalt Refining and Modification Methods. Energy & Fuels, Vol. 33, No. 4, 2019, pp. 2680–2698.
21.
ElwardanyM. D.KingG.PlancheJ. P.RodeznoC.ChristensenD.Fertig IIIR. S.KuhnK. T.BhuiyanF. H.Internal Restraint Damage Mechanism for Age-Induced Pavement Surface Distresses: Block Cracking and Raveling. Journal of the Association of Asphalt Paving Technologists, Vol. 88, 2019, pp. 1–47.
CroninK.Email Correspondence titled “DSC Evaluation_RPE 1-4.”Accessed June 27, 2019.
25.
PanabakerH.DuPont Innovative Asphalt Modifiers: How to save money with Elvaloy® RET and EntiraTM Bond asphalt modifiers. Southeast Asphalt User/Producer Group (SEAUPG) Annual Meeting, San Antonio, Texas, 2007.
26.
ChenC.YinF.TurnerP.WestR. C.TranN.Selecting a laboratory loose mix aging protocol for the NCAT top-down cracking experiment. Transportation Research Record, Vol. 2672, No. 28, 2018, pp. 359–371.
27.
ChenC.YinF.AndriescuA.MoraesR.MenschingD.TranN.TaylorA.WestR.Preliminary Validation of the Critical Aging Protocol for NCAT Top-down Cracking Experiment. Journal of the Association of Asphalt Paving Technologists, 2020 (In press).
28.
MoraesR. Validation of the Bitumen Bond Strength Test Using Surface Energy Measurements. MSc. Thesis, University of Wisconsin-Madison, 2011.
29.
MoraesR.VelasquezR.BahiaH. U.Measuring the Effect of Moisture on Asphalt–aggregate Bond with the Bitumen Bond Strength Test. Transportation Research Record, Vol. 2209, No. 1, 2011, pp. 70–81.
30.
RadF.Y.ElwardanyM. D.CastorenaC.KimY. R. (2017). Investigation of Proper Long-term Laboratory Aging Temperature for Performance Testing of Asphalt Concrete. Construction and Building Materials, Vol. 147, 2017, pp. 616–629.
31.
YinF.ArambulaE.LyttonR.Epps MartinA.CucalonL. G.Novel Method for Moisture Susceptibility and Rutting Evaluation using Hamburg Wheel Tracking Test. Transportation Research Record, Vol. 2446, No. 1, 2014, pp. 1–7.
32.
YinF.ChenC.WestR.Epps MartinA.Arambula-MercadoE.Determining the Relationship Among Hamburg Wheel-Tracking Test Parameters and Correlation to Field Performance of Asphalt Pavements. Transportation Research Record, Vol. 2674, No. 4, 2020, pp. 281–291.
33.
WenH.WuS.MohammadL. N.ZhangW.ShenS.FaheemA.Long-term Field Rutting and Moisture Susceptibility Performance of Warm-mix Asphalt Pavement. Transportation Research Record, Vol. 2575, No. 1, 2016, pp. 103–112.
34.
GarciaV. M.MiramontesA.GaribayJ.AbdallahI.CarrascoG.LeeR.NazarianS.Alternative Methodology for Assessing Cracking Resistance of Hot Mix Asphalt Mixtures with Overlay Tester. Road Materials and Pavement Design, Vol. 18, Supplement 4, 2017, 388–404.
35.
AndersonD. A.Le HirY. M.MarasteanuM. O.PlancheJ. P.MartinD.GauthierG.Evaluation of Fatigue Criteria for Asphalt Binders. Transportation Research Record, Vol. 1766, No. 1, 2001, pp. 48–56.
36.
ElwardanyM.PlancheJ.-P.KingG.“Universal and Practical Approach to Evaluate Asphalt Binder Resistance to Thermally-Induced Surface Damage.”Construction and Building Materials, Vol. 255, 2020, p. 119331.
37.
RobertsonR. E.Chemical Properties of Asphalts and Their Effects on Pavement Performance (No. 499). Transportation Research Board, National Research Council.
