Interrelationship between Chemistry and Performance Grade Properties of Blended Bitumen

نویسنده

  • N. K. Rajan
چکیده

Manifestation of rheological properties of bituminous binders over a wide a range of temperature in real life pavements can be attributed to various factors viz. crude source, processing methods, oxidative aging and chemical composition. A clear understanding of the fundamental chemical and rheological properties of bitumen and their interrelationship is important to address issues related to binder characterization and performance. In this study, blended bitumen samples were prepared using three different crude sources and three blend proportions of PDA pitch and Heavy Extract. All the samples were subjected to both short term aging and long term aging. Corbett’s fractionation procedure was conducted to evaluate the chemical composition of the bituminous samples at unaged, short term aged and long term aged conditions. Further, Performance Grading (PG) tests were conducted on all the samples at both high and intermediate temperatures as per ASTM procedure. An attempt was made to develop an inter-relationship between the PG properties and chemical composition of bitumen. From the results, the role of asphaltenes on the rheological behavior of blended bitumen was clearly evident

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تاریخ انتشار 2015