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Crack Evolution of Bitumen Under Torsional Shear Fatigue Loads

Gao, Yangming / Li, Linglin / Zhang, Yuqing

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.

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Crack Evolution of Bitumen Under Torsional Shear Fatigue Loads

Gao, Yangming / Li, Linglin / Zhang, Yuqing

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.

Crack Evolution of Bitumen Under Torsional Shear Fatigue Loads

Gao, Yangming / Li, Linglin / Zhang, Yuqing

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.

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Title:

Crack Evolution of Bitumen Under Torsional Shear Fatigue Loads

Additional title:

RILEM Bookseries

Contributors:

Di Benedetto, Hervé (editor) / Baaj, Hassan (editor) / Chailleux, Emmanuel (editor) / Tebaldi, Gabriele (editor) / Sauzéat, Cédric (editor) / Mangiafico, Salvatore (editor) / Gao, Yangming (author) / Li, Linglin (author) / Zhang, Yuqing (author)

Conference:

RILEM International Symposium on Bituminous Materials ; 2020 ; Lyon, France

Published in:

Proceedings of the RILEM International Symposium on Bituminous Materials ; Chapter: 61 ; 481-487

RILEM Bookseries ; 27

Publication date:

2021-09-26

Size:

7 pages

ISBN:

978-3-030-46455-4 , 978-3-030-46454-7

ISSN:

2211-0852 , 2211-0844

DOI:

https://doi.org/10.1007/978-3-030-46455-4_61

Type of media:

Article/Chapter (Book)

Type of material:

Electronic Resource

Language:

English

Keywords:

Bitumen , Fatigue , Crack evolution , Paris’ law , Pseudo J-integral Engineering , Building Materials , Characterization and Evaluation of Materials , Geoengineering, Foundations, Hydraulics

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