Comparative laboratory performance of asphalt concrete with high bonding polymer modified bitumen HBA-50 and 60 pen grade bitumen.

Darmansyah, Herman (2012) Comparative laboratory performance of asphalt concrete with high bonding polymer modified bitumen HBA-50 and 60 pen grade bitumen.

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Recently, flexible pavements made with conventional bitumen do not have the properties needed to cope satisfactorily with traffic loading that is increasing in magnitude and frequency, particularly in adverse climatic conditions. Research was focused on modifying the properties of conventional bitumen by additives that enhance binder durability and temperature susceptibility while retaining flexibility and resistance to permanent deformation. This thesis describes a laboratory evaluation of HBA-50 and its properties are compared with those of conventional 60 pen bitumen as are the properties of asphalt concrete surfacing mixes made with those binders. Penetration tests made before and after TFOT indicate that in the higher temperature range (30 degree C - 35 degree C) HBA-50 is less temperature susceptible than Pen-60. Saybolt-Furol viscosity tests before TFOT show that the viscosity of HBA-50 is consistently higher than that of Pen-60 but more sensitive to temperature variation. Durability was assessed in terms of loss on heating, change in Softening Point after TFOT and retained penetration. The data are inconclusive and suggest that conventional penetration tests and measurements of viscosity using the Saybolt-Furol apparatus may not be suitable for characterizing polymer-modified bitumen such as HBA-50. Optimum Bitumen Contents (OBC) for the HBA-50 and Pen-60 mixes were determined by Marshall analysis to be, respectively, 7.4 and 6.9; the corresponding values of Index of Retained Stability were obtained to be 92.2 and 86.6. At OBC there is no significant.. difference in the value of indirect tensile strength and indirect tensile resilient modulus obtained for both mixes over a range of temperatures. In the higher temperature range the HBA-50 mix exhibits marginally higher values for these parameters and in the lower temperature range is less temperature susceptible. In the Wheel Tracking Test the HBA-50 mix is better able to resist deformation at higher temperatures but has almost identical performance with the Pen-60 mix at lower temperatures. The results suggest that fundamental tests on the binder, e.g. viscosity measurements by sliding plate microviscometer and repeated loading tests on mixes, are neede for a comprehensive evaluation of polymer-modified bitumen such as HBA-50.

Item Type: Article
Subjects: Collections > Koleksi Perpustakaan Di Indonesia > Perpustakaan Di Indonesia > JBPTITBPP > S2-Theses > Engineering > Highway Systems And Eng. > 1999
Divisions: Universitas Komputer Indonesia > Perpustakaan UNIKOM
Depositing User: Admin Repository
Date Deposited: 16 Nov 2016 07:37
Last Modified: 16 Nov 2016 07:37

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