بررسي كاربرد ذرات لاستيك در قير بر پارامترهاي ساختاري و رفتار قير

چكيده انگليسي :

The effects of structural and blending conditions of rubber particles on bitumen behavior Amin Taerian a taerian@cv iut ac ir Date of Submission 17 03 2013 Department of Civil Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisors S M Abtahi mabtahi@cc iut ac ir B Koosha cgkoosha@cc iut ac irAbstractThe final disposal of scrap tires is an extremely serious environmental problem nowadays Generally every tire ever manufactured is discarded posing a potential threat to public health andthe environment The reuse of scrap tires has become a challenge all over the world since thismaterial takes nearly 600 years to decompose completely On the other hand the construction and maintenance of road pavements should be long lasting dueto their major impact on the economy of a nation The main reasons for the weak performance ofroads include the increase in the overall traffic poor material quality and or climatic effects Therefore the need for better performance of pavements has constrained pavement engineers todevelop the modified asphalts The modified asphalt mainly improves permanent deformation rutting fatigue low temperature cracking friction resistance and adherence of pavements Researchers have shown that ground tire rubber can be added to asphalt compositions Mainly theuse of this material partially reduces the need for new raw materials while improves the performanceand life cycle of asphalt pavements Rubber modified asphalt concrete is an environmentally correctsolution The obvious benefit of adding rubber to bitumen is that the rubber imparts elasticity to the binder which helps increscent in fatigue life of flexible pavements as well as reduces reflective cracking This elasticity can also improve pavement flexibility and resistance to low temperature cracking Ithas been reported that rubber also improves the aging resistance the tensile strength ductility toughness resiliency tenacity and thus the durability of rubber modified asphalt mixtures This dissertation investigates the effects of structural and blending conditions of rubber particles onbitumen behavior by using four types of tests i e Pull out FTIR DSR and PG The pull out test was designed to investigate the interfacial shear stress between asphalt neat and ormodified and aggregate According to the experimental design the effects of rubber particlecontent blending temperature mixing time and types of aggregate limestone and or steel slag wereinvestigated on the pull out force The optimized conditions of preparation of rubber modifiedasphalt concrete were obtained Therefore with the optimum condition of preparation further testswere being conducted The FTIR test was designed to investigate the interaction between binder and rubber After that toinvestigate the performance of asphalt rubber concrete the dynamic shear rheometer DSR test wasconducted Consequently performance grade PG of asphalt rubber was carried out to evaluate thehigh temperature performance of asphalt Studies and experiments indicate that use of ground rubber to modify binder is desirable from standpoint of technical In addition it is desirable from an environmental point of view and economicstandpoint Key Wordsrubber asphalt crumb rubber reclaimed rubber Pull out test FTIR Dynamic shearrheometer test Performance grade

طائريان، امين

بررسي كاربرد ذرات لاستيك در قير بر پارامترهاي ساختاري و رفتار قير

قير لاستيكي , خرده لاستيك , ريكليم , آزمون نيروي خروج , طيف سنجي تبديل فوريه , رئومتر برش ديناميكي , رده عملكردي