23–26 Jul 2024
Europe/Lisbon timezone

Fatigue behavior of bitumen and mastic using higher-order harmonics

25 Jul 2024, 12:00
15m
Room A

Room A

Speaker

Catherine Sanchana (Indian Institute of Technology Madras, India)

Description

Abstract. The fatigue life of the bituminous pavement is influenced by the fatigue behavior of each of its constituents. This study focuses on the fa-tigue behavior of bituminous material at two scales: bitumen and mastic. Conventional methods to determine the fatigue life of bitumen using time sweep tests make use of post-processing techniques established for bitumi-nous mixtures and these post-processing techniques make use of linear vis-coelastic parameters for the same. In this study, a new approach based on higher-order harmonic information obtained from a response stress wave-form when subjected to repeated strain-controlled oscillatory shear loading is used. This approach works on the assumption that the occur-rence/evolution of higher-order harmonics in a material exhibiting line-ar/nonlinear response when subjected to repeated loading is attributed to damage. For this, time sweep data at different frequencies and strain ampli-tudes are obtained using the large-amplitude oscillatory shear mode for bi-tumen and mastic under unaged and long-term aged conditions for 20000 cycles. The fatigue life is determined using the new approach involving the use of higher-order harmonics along with two conventional approaches and compared. Also, a fatigue range is established using these approaches to as-certain the influence of strain amplitude, frequency and aging on the fatigue behavior of bitumen and mastic.

Co-authors

J Murali Krishnan (Indian Institute of Technology Madras, India) Sarath Prasad (Indian Institute of Technology Madras, India)

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