The viscosity-reducing mechanism of organic wax additive on CRMA

Xin Yu, Yuhong Wang, Tangzhong Wei

Research output: Journal article publicationJournal articleAcademic researchpeer-review

9 Citations (Scopus)


CRMA was prepared by mixing PG 64-22 asphalt with crumb rubber powder of 40 mesh size and 18% by weight of the asphalt. Sasobit®, a typical organic wax additive, was selected and added into CRMA. A series of tests, namely, brookfield viscosity, environmental scanning electron microscope(ESEM), component test, differential scanning calorimeter(DSC), fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR) were conducted on CRMA with and without organic wax additive, and microcosmic appearance, component content and molecular structure of various asphalt binders were obtained. The test results indicate that the addition of Sasobit® into CRMA can effectively change the contents of components: the content of asphaltenes increases relatively, while saturates decreases. In addition, the interaction between various components of CRMA is weakened, and the state of equilibrium between the dispersant and dispersed phase is changed at the same time. That is why the viscosity decreases after the organic wax additive is added into CRMA.
Original languageEnglish
Pages (from-to)726-732
Number of pages7
JournalJournal Wuhan University of Technology, Materials Science Edition
Issue number4
Publication statusPublished - 1 Aug 2013


  • crumb rubber modified asphalt (CRMA)
  • mechanism
  • organic wax additives
  • viscosity-reducing

ASJC Scopus subject areas

  • General Materials Science


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