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Rheological properties of crumb rubber modified bitumen - A lab study
Rheological properties of bitumen for road surfaces must be enhanced by use of additives to provide more durability to pavements under extreme climatic conditions and increased traffic density. The significant variations of daily and seasonal temperature and the overloading of commercial vehicles cause early and increased distress conditions (ravelling, undulation, rutting, cracking, bleeding, shoving and potholing). Here, bitumen was modified with CR (crumb rubber) to CRMB (CR-modified bitumen). DMA (dynamic mechanical analysis) was applied to characterise the CRMB using a dynamic shear rheometer, the SR5 Ashphalt Rheometer. Changes in rheological and other properties of 60/70 and 80/100 grades bitumen modified with CR were studied, i.e. complex modulus, binder elasticity, loss modulus, softening point, penetration, and viscous and viscoelastic behaviour. CR improves complex modulus and elastic response of bitumen at high temperatures. While neat bitumen had lost elasticity at 70 deg C, CRMB still displayed considerable elasticity.
Rheological properties of crumb rubber modified bitumen - A lab study
Rheological properties of bitumen for road surfaces must be enhanced by use of additives to provide more durability to pavements under extreme climatic conditions and increased traffic density. The significant variations of daily and seasonal temperature and the overloading of commercial vehicles cause early and increased distress conditions (ravelling, undulation, rutting, cracking, bleeding, shoving and potholing). Here, bitumen was modified with CR (crumb rubber) to CRMB (CR-modified bitumen). DMA (dynamic mechanical analysis) was applied to characterise the CRMB using a dynamic shear rheometer, the SR5 Ashphalt Rheometer. Changes in rheological and other properties of 60/70 and 80/100 grades bitumen modified with CR were studied, i.e. complex modulus, binder elasticity, loss modulus, softening point, penetration, and viscous and viscoelastic behaviour. CR improves complex modulus and elastic response of bitumen at high temperatures. While neat bitumen had lost elasticity at 70 deg C, CRMB still displayed considerable elasticity.
Rheological properties of crumb rubber modified bitumen - A lab study
Kumar, Praveen (author) / Mehndiratta, H.C. (author) / Singh, K. Lakshman (author)
2009
5 Seiten, 8 Tabellen, 3 Quellen
Article (Journal)
English
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