Ageing effect on the relaxation properties of bitumen

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Abstract

The ageing of bitumen has a significant impact on the mechanical behavior of asphalt concrete. In this study, Dynamic Shear Rheometer (DSR) tests were utilized to investigate the effect of ageing on the relaxation properties of bituminous materials. PEN 70/100 bitumen films with thickness of 2 mm were exposed to laboratory ageing at various conditions. Specifically, different combinations of ageing time, temperature and pressure were applied on the bitumen films. Three evaluation indices, explicitly the shear stress at 0 s and 100 s, the ratio of shear stress at 0 s and 100 s and the time that shear stress reduces to 50% and 25% of the initial value, were used to determine the evolution of the relaxation properties of bitumen. The results show that, in comparison to fresh bitumen, aged samples show higher residual shear stresses after relaxation and are more susceptible to stress accumulation thus cracking. In addition, temperature, followed by pressure and ageing time, was found to have the stronger impact on bitumen ageing.
Original languageEnglish
Title of host publicationAdvances in Materials and Pavement Prediction: Papers from the International Conference on Advances in Materials and Pavement Performance Prediction (AM3P 2018), April 16-18, 2018, Doha, Qatar
EditorsEyad Masad, Amit Bhasin, Tom Scarpas, Ilaria Menapace, Anupam Kumar
PublisherCRC Press
Chapter83
Number of pages4
ISBN (Electronic)9780429855801
ISBN (Print)9781138313095
DOIs
Publication statusPublished - 2018
EventAM3P 2018: International Conference on Advances in Materials and Pavement Performance Prediction - Doha, Qatar
Duration: 16 Apr 201818 Apr 2018
Conference number: 5
http://www.am3p.com/

Conference

ConferenceAM3P 2018: International Conference on Advances in Materials and Pavement Performance Prediction
Abbreviated titleAM3P 2018
CountryQatar
City Doha
Period16/04/1818/04/18
OtherInspired from the legacy of the previous four 3DFEM conferences, AM3P continues the same theme i.e. models, experimental methods to measure properties and determine model parameters, implementation and utilization for material or pavement performance prediction.
Internet address

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