Evaluation of mix ingredients on the performance of rubber-modified asphalt mixtures Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/g732df67p

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  • Rubber-modified asphalt pavements have been used in Sweden andthe United States since the 1970's. In these applications groundrecycled tire particles (0.25 inch minus) are added to a gap-gradedaggregate and then mixed with hot asphalt cement. The benefits ofadding rubber to the mix include increased skid resistance under icyconditions
  • Rubber-modified asphalt pavements have been used in Sweden andthe United States since the 1970's. In these applications groundrecycled tire particles (0.25 inch minus) are added to a gap-gradedaggregate and then mixed with hot asphalt cement. The benefits ofadding rubber to the mix include increased skid resistance under icyconditions, improved flexibility and crack resistance, elimination ofsolid waste, and reduced traffic noise. The major disadvantage ofthese rubber-modified mixes is their high cost in relation to conventionalasphaltic concrete pavements.This research project consisted of a laboratory study of mixproperties as a function of variables such as rubber gradation andcontent, void content, aggregate gradation, mix process, temperature,and asphalt content. Twenty different mix combinations were evaluatedfor diametral modulus and fatigue at two different temperatures (-6°C,+10°C). Also, five different mix combinations were evaluated forstatic creep and permanent deformation. Layered theory was used toevaluate the effects of mixture variations on pavement life. Theresulting information was used to develop guidelines for use of rubberasphalt mixes in United States road systems.The findings of the field survey indicate that the rubber-modifiedasphalt mixture is more susceptible than the conventionalmixtures to preparation and compaction problems when adverse weather orequipment problems occur. However, with adequate equipment andfavorable weather conditions, the rubber-modified asphalt mixtureplacement is similar to conventional mixture placement. The fieldstudy also indicates that stopping distances can be reduced 20 percentfor the rubber-modified pavements in icy conditions. In view of thesignificant reductions in wintertime stopping distances under icy orfrosty road surface conditions, the use of coarse rubber in asphaltpavements should be seriously considered. This is particularly truefor areas such as bridge decks, on and off freeway ramps or insulatedroadway sections.The findings of the laboratory study indicate that the rubbergradation and content, aggregate gradation, and use of surcharge duringsample preparation have considerable effect on modulus and fatigue lifeof the mix. The results of static creep and permanent deformationtests indicate that the rubber asphalt mixes had low stability and highelasticity. Also, due to greater allowable tensile strain in rubber-modifiedmixtures, the thickness of the modified mixture can bereduced, using a layer equivalency of 1.4 to 1.0.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-07-30T20:39:51Z (GMT) No. of bitstreams: 1 TakallouHosseinB1988.pdf: 3076229 bytes, checksum: e9991498fd5d2297a7a50a7c37f32cd5 (MD5)
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