INFLUENCE OF RUBBER CONSTITUENTS ON PERFORMANCE OF ASPHALT PAVING MIXTURES
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Abstract
Environmental problems created by discarded waste rubbers, such as potential fire and diseas hazards, have become significant in recent years. In connection with rubber recycling, a comparative study of laboratory performance of application of two polymer types: styrene butadiene rubber (SBR) and polyethylene–vinyl acetate (PVA) in asphalt paving mixtures is presented. These mixtures are
usually employed in construction the surface courses in Iraq. These modified asphalt mixtures were prepared with asphalt cement previously modified by using three percents of polymer (1, 3 and 5) percent by weight of modified asphalt. Two control mixes are adopted for comparison purpose. The first control mix was produced with 40/50 penetration asphalt cement while the second was produced with 60/70 penetration asphalt cement. To evaluate the mixture characteristics of the modified and conventional mixes: laboratory tests of Marshall, indirect tensile strength, indirect tensile resilient modulus, indirect tensile fatigue and incremental indirect tensile creep were conducted on a compacted Marshall specimens. The VESYS 5W software program was used to investigate the effect of polymer type on rut depth occurring in whole selected pavement structure. The results of the present study indicated that the modified mixtures exhibited higher tensile strength characteristics than the control mixtures. The modified asphalt mixtures showed overall better performance indices (rut depth and fatigue cracks) than the corresponding control mixtures. Also, the addition of (SBR) polymer type to the mixture improves asphalt mixture performance, especially, when it is added by 1 % by weight of aspha
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References
· ASTM Standards, (2003), "Roads and Paving Materials” , Annual Book of the American Society for Testing and Materials Standards, Section 4, Vol. 04-03.
· Bahia, H.U., Hanson, D.I., Zeng, M., Zhia, H., and Khatri, M.A., and Anderson, R.M., (2001), “ Characterization ofModified Asphalt Binders in Superpave Mix Design", NCHRP Report 459.
· FHWA, (2003),"VESYS 5W’s User Manual ", Federal Highway Administration Office (FHWA) of Infrastructure Research and Development, Truck Pavement Interaction Program, June 26, Washington, D.C.
· Harvey, J., Lee, T., Sousa, J., Pak, J., and Monismith, C.L., (1994), "Evaluation of Fatigue and Permanent Deformation Properties of Several Asphalt-Aggregate Field Mixes Using Strategic Highway Research Program A-003A Equipment", Transportation Research Record 1454, 123,1994.
· Harvey, J., J.A. Deacon, B. Tsai, and C.L. Monismith, (1995), "AFatigue Performance of Asphalt Concrete Mixes and its Relationship to Asphalt Concrete Pavement Performance in California” , California Department of Transportation, Report No. RTA-65W485-2, October.
· Harvey, J.T., J.A. Deacon, A.A. Tayebali, R.B. Leahy, and C.L. Monismith, (1997) “ AReliability- Based Mix Design and Analysis System for Mitigating Fatigue Distress” , Eighth International Conference on Asphalt Pavements, Seattle, Washington, 1997.
· Institute for Transportation Studies, University of California at Berkeley, (1994), "Fatigue Response of Asphalt-Aggregate Mixes ", SHRP-A-404.
· Institute for Transportation Studies, University of California at Berkeley, "Permanent Deformation Response of Asphalt-Aggregate Mixes", SHRP-A-415, 1994.
· Khattak, M.J. and Baladi, G.Y., (2001), "Fatigue and Permanent Deformation Models for Polymer-Modified Asphalt Mixtures” , Transportation Research Record 1767, 135.
· Khosla, N. P., Brian Birdsall, and S. Kawaguchi, (2000), "Evaluation of Moisture Susceptibility of Asphalt Mixtures – Conventional and New Methods " Transportation Research Record No. 1728.
· Little, D.N., Lytton, R.L., Williams, D., and Kim, Y.R.,(1999), "An Analysis of the Mechanism of Microdamage Healing Based on Application of Micromechanics First Principles of Fracture and Healing", Journal of the Association of Asphalt Paving Technologists 68, 501.
· Loulizi, A., Al-Qadi, I.L., Lahour, S., and Freeman, T.E., (2002), "Measurement of Vertical Compressive Stress Pulse in Flexible Pavements and Its Representation for Dynamic Loading", Transportation Research Board, Paper No.02-2376.
· Newman, J.K., (2000) , "Polymer Modification of Asphalt Mixtures Designed for Military Airfield Pavements; Fatigue Properties According to AASHTO TP-8", Transportation Systems 2000 Workshop, San Antonio, Texas, February 28-March 3.
· Nukulchai, W.K., Kongsuwan, S., Sawatparnich, A., and Singhatiraj, P., (2007), "Rubber-Modified Asphalt for Better Road Pavement", www.doh.go.th./dohweb/project/rubber.pdf.
· Mohammad, L.N. and Paul, H., (1993), "Evaluation of the Indirect Tensile Test for Determining the Structural Properties of Asphalt Mix” , Transportation Research Record, No. 1417, TRB, National Academy of Science, Washington, D.C.
· Robber, F.L., Kandhal, P.S., Brown, E.R., and Dunning, R.L., (1989), "Investigation and Evaluation ofGround Tire Rubber in Hot Mix Asphalt ", National Center for Asphalt Technology.
· State Commission of Roads and Bridges (SCRB), (2003), "General Specification for Roads and Bridges ", Republic of Iraq, Ministry of Housing and Construction, Department of Planning and Studies, Baghdad, Revised Edition, Addendum No.3.
· Spanish Ministry of Public Works, (1990), “ NLT-350 Flexural Test to Measure the Fatigue Strength of Bituminous Mixtures” , Madrid.
· Taylor, M. A. and N. P. Khosla., (1983), “Stripping of Asphalt Pavements: State of the Art” , Transportation Research Record 911. TRB, National Research Council, Washington, DC, 1983.
· Wegan, V. and Brule, B., (1999), "The Structure of Polymer Modified Asphalt Binders and Corresponding Asphalt Mixtures", Journal of the Association of Asphalt Paving Technologists, 68, 64.