Investigation of asphalt mixture strength at low temperatures with the bending beam rheometer

Augusto Cannone Falchetto, Mihai Marasteanu, Sreelatha Balmurugan, Ioan I. Negulescu

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


A new strength test method for asphalt mixture at low temperatures is presented in this paper. The method uses a modified bending beam Rheometer (BBR), capable of applying loads at different rates. Two major factors, that can significantly affect strength, were analysed: cooling medium and specimen size. Similar strength values were obtained in air and potassium acetate and significantly lower values were obtained in ethanol. Preliminary investigation with sodium fluorescein (FL) indicates the fluorescing marker diffused in mixtures when ethanol was used. The failure distributions of BBR mixture beams and of larger beams (LBs) were analysed using histogram testing and size effect theory. Different Weibull moduli were obtained for BBR and for the LB, which indicates that BBR beams may be too small to capture the representative volume element of the material.

Original languageEnglish (US)
Pages (from-to)28-44
Number of pages17
JournalRoad Materials and Pavement Design
Issue numberSUPPL.1
StatePublished - Jun 2014


  • asphalt mixture
  • bending beam rheometer
  • cooling medium
  • size effect
  • strength test


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