Experimental Assessment of Dense Bituminous Macadam (DBM) Binder Course with the Binder Modified with Poly Phosphoric Acid

Bitumen is used as a binder material in flexible pavement construction apart from its many other applications. This binder exhibits complex behavior with ever varying consistencies at different temperatures. Usually bitumen for paving applications is recommended based variations in pavement / ambient temperatures and other crucial climatic conditions. Hard bitumen grades are recommended in hot regions while the softer ones in colder climatic conditions to resist rutting and stripping failures respectively. Binders obtained from refineries rarely possess adequate softness and stiffness to comply with these requirements. In order to enhance the performance of these binders, it is quite common to modify these with many modifications such as acids, minerals and polymers. It can be found from the literature that these modified binders have been tried and tested in many case studies with varied levels of success. Acid modification is gaining its popularity during the recent past with researchers finding considerable improvement in the performance of these modified binders in the form of increased complex modulus and reduced phase angle. However, studies on the performance of acid modified bitumen on bituminous concrete mixes and in particular for binder courses; Dense Bituminous Macadam (DBM) are very limited in India and elsewhere too. This paper is an attempt to share the experimental observations made on the performance of dense bituminous macadam with Poly Phosphoric Acid (PPA) modified binder. Gradation II DBM, recommended by Ministry of Road Transport and Highways (MoRT&H), India has been selected for investigations in the present research work. The parameters considered for performance assessment are Marshall’s Stability, Marshall’s Flow value, volume of voids (Vv), Voids Filled with Bitumen (VFB), Voids in Mineral Aggregates (VMA), bulk specific gravity, Indirect Tensile Strength (ITS) and Resilient Modulus.

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  • Supplemental Notes:
    • Abstract reprinted with permission from the publisher.
  • Authors:
    • Ram, V Vinayaka
    • Ramayya, V Venkat
    • Krishnaiah, S
    • Sandra, Amarendra Kumar
  • Publication Date: 2019-6

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 11-19
  • Serial:
    • Indian Highways
    • Volume: 47
    • Issue Number: 6
    • Publisher: Indian Roads Congress
    • ISSN: 0376-7256

Subject/Index Terms

Filing Info

  • Accession Number: 01709491
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 28 2019 11:38AM