The use of natural rubber latex as a renewable and sustainable modifier of asphalt binder

Yong Wen, Yuhong Wang, Kecheng Zhao, Agachai Sumalee

Research output: Journal article publicationJournal articleAcademic researchpeer-review

35 Citations (Scopus)

Abstract

Natural rubber (NR) powder as a bio-modifier of asphalt binder has been shown to have some beneficial effects. However, there is limited research into the use of the liquid form of NR, i.e. concentrated NR latex, as an asphalt binder modifier. Compared to NR powder, NR latex is cheaper and more accessible in some countries, and potentially creates viscosity-reducing foams in the modified binder during mixture production. In this research, asphalt binders modified with different amount of NR latex were systematically studied, including the rotational viscosities, rutting resistance, fatigue resistance, low-temperature behaviour and temperature sensitivity. The dispersion of the NR latex in the modified binders was examined using fluorescence microscope and atomic force microscope. Test results indicate that the addition of NR latex increases the viscosity and elastic recovery of the modified binders and potentially enhances asphalt pavements’ resistance to rutting, thermal cracking and fatigue damage. The NR latex also reduces the temperature sensitivity of the modified binders. The optimum NR latex content was found to be 7% of the total mass of the modified binder. A network of extensive microstructures mixed with bubbles was identified in the modified binders under heat. As a renewable and sustainable material, NR latex has the potential to be used as an effective asphalt modifier.
Original languageEnglish
Pages (from-to)547-559
Number of pages13
JournalInternational Journal of Pavement Engineering
Volume18
Issue number6
DOIs
Publication statusPublished - 3 Jun 2017

Keywords

  • atomic force microscope (AFM)
  • fluorescence microscope
  • multiple stress creep recover (MSCR)
  • Natural rubber latex
  • rheological properties
  • rubber-modified asphalt

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Mechanics of Materials

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