Crack Evolution of Bitumen Under Torsional Shear Fatigue Loads

Yangming Gao, Linglin Li, Yuqing Zhang*

*Corresponding author for this work

Research output: Chapter in Book/Published conference outputChapter


This study aims to model crack evolution in bitumen under a torsional shear fatigue load by dynamic shear rheometer (DSR). Fatigue crack length in the bitumen was predicted using a damage mechanics-based DSR cracking (DSR-C) model. The crack evolution is modelled using a pseudo J-integral based Paris’ law. Frequency weep tests and time sweep fatigue tests were conducted on an unmodified bitumen 40/60 and a polymer-modified bitumen X-70 at different temperatures, frequencies and loading amplitudes. Results demonstrate that the pseudo J-integral Paris’ law can accurately predict the crack evolution in the bitumen under the torsional shear fatigue load. A stiffer bitumen due to decreasing temperature has a smaller Paris’ law coefficient A and a greater exponent n, which proves that the fatigue crack grows faster at a lower temperature. The Paris’ law coefficients A and n are temperature-dependent fundamental material properties, which are independent of loading frequency or loading amplitude.

Original languageEnglish
Title of host publicationRILEM Bookseries
EditorsH. Di Benedetto, H. Baaj, E. Chailleux, G. Tebaldi, C. Sauzéat, S. Mangiafico
Number of pages7
ISBN (Electronic)978-3-030-46455-4
Publication statusPublished - 2022

Publication series

NameRILEM Bookseries
ISSN (Print)2211-0844
ISSN (Electronic)2211-0852


  • Bitumen
  • Crack evolution
  • Fatigue
  • Paris’ law
  • Pseudo J-integral


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