Application of a parameter based on linear-elastic fracture mechanics to predict the fatigue resistance of asphalt binders

Authors

DOI:

https://doi.org/10.14295/transportes.v28i5.2090

Keywords:

LAS test, Fracture mechanics, Continuum mechanics, Fatigue resistance, Modified binders

Abstract

Fatigue tests and parameters for asphalt binders have been developed as alternatives to the parameter G*.sind, but they also present limitations. Recent studies indicated that the fatigue damage tolerance index (af) of the Linear Amplitude Sweep (LAS) test was inefficient to characterize some modified asphalts. An approach based on the Linear Elastic Fracture Mechanics (LEFM) showed to be effective to analyze the data of the LAS test, also for the cases in which was not possible to determine the af index. In this work, the parameter of fatigue tolerance based on LEFM (aLEFM) was evaluated concerning its applicability and representation of the fatigue behavior. The indices aLEFM, af and BFF (binder fatigue factor) were compared in terms of their applicability to tests carried out with six asphalt binders (two neat and four modified ones) at three temperatures. It was possible to obtain the aLEFM index for a higher number of cases than the af index, which would indicate a higher applicability of the index based on the LEFM when compared with the af index. The BFF presented the highest applicability among the three indices. The aLEFM presented good correlation with af  and BFF, however aLEFMand af did not present significant correlation with the parameter Np20 obtained from the Time Sweep (TS) test. Among the indices aLEFM, af and BFF, BFF presented the highest correlation with Np20.

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Author Biographies

Daniela Corassa Garcia, Universidade de São Paulo, São Paulo – Brasil

Mestranda do Programa de Pós-graduação em Engenharia de Transportes da Escola de Engenharia de São Carlos

Área: Infraestrutura de Transportes

Adalberto Leandro Faxina, Universidade de São Paulo, São Paulo – Brasil

Docente do Departamento de Engenharia de Transportes da Escola de Engenharia de São Carlos

Área: Infraestrutura de Transportes

Edson Denner Leonel, Universidade de São Paulo, São Paulo – Brasil

Docente do Departamento de Engenharia de Estruturas da Escola de Engenharia de São Carlos

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Published

2020-12-15

How to Cite

Garcia, D. C., Faxina, A. L., & Leonel, E. D. (2020). Application of a parameter based on linear-elastic fracture mechanics to predict the fatigue resistance of asphalt binders. TRANSPORTES, 28(5), 99–116. https://doi.org/10.14295/transportes.v28i5.2090

Issue

Vol. 28 No. 5 (2020)

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Artigos

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