Laboratory performance of polymer modified warm mix asphalt

Polymer modified bituminous mixes (pmbm) are used in road construction for improved performance. The drawbacks in use of pmbm over mixes of conventional bitumen are need of higher mixing, and laying and rolling temperatures, leading to higher consumption of fuel. Warm mix asphalt (WMA) is produced at lower temperatures, while maintaining key advantages of hot mixes. Therefore, WMA is becoming an attraction in the highway profession. The aim of this paper is to report findings of the mechanistic study undertaken on polymer-modified warm mix asphalt (pmwma) for reduction of mixing, laying and rolling temperature. The optimum dose of organic surfactant type additive for reduction of operational temperatures is determined based on viscosity - temperature relationship and performance properties of pmwma. From the laboratory studies it is found that optimum dose of organic surfactant additive lies in the range of 1.5 to 2.0% by weight of pmb to achieve lower mixing, laying and rolling temperature. The reduction in temperatures by a factor of 15 to 25°C is achieved. Values of creep modulus and resilient modulus of pmwma are found superior at different temperatures, indicating better performance. Rutting in pmwma mix is found lower compared to traditional pmb mix. Fatigue life of pmwma mixes determined by four point bending beam fatigue test is observed higher than conventional pmb mix. The better retained indirect tensile strength ratio values indicate potential of pmwma towards prevention of moisture damage even after compaction at lower temperature. Improved performance of pmwma alleviate compaction problem of traditional hot pmb mixes at lower temperature.

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  • Supplemental Notes:
    • Abstract reprinted with permission from the publisher.
  • Authors:
    • Jain, P K
    • Rongali, Uma Devi
    • Chourasiya, Anita
    • Ramizraja, M Munshi
  • Publication Date: 2014

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 25-33
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01528513
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 16 2014 5:21PM