Contribution of asphalt rubber mixtures to sustainable pavements by reducing pavement thickness

Asphalt rubber mixtures have been used as pavement surface layers due to their ability to prevent early degradation, and are considered a sustainable option. This study performed analysis comparing the fatigue resistance of asphalt rubber mixtures of different combinations of asphalt bases, crumb ru...

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Bibliographic Details
Published in:Materials 2022-12, Vol.15 (23), p.1-17
Main Authors: Thives, Liseane Padilha, Pais, Jorge C., Pereira, Paulo A. A., Palha, Carlos Alberto Oliveira Fernandes, Trichês, Glicério
Format: Article
Language:English
Subjects:
Analysis
Asphalt industry
Asphalt mixes
Asphalt mixtures
Asphalt pavements
Asphalt rubber
Bending fatigue
Cracking
Fatigue strength
Fatigue tests
Mechanical properties
Pavement design
Pavements
Rubber
Science & Technology
Scrap
Surface layers
Sustainability
Sustainable
Thickness
Tires
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Summary:Asphalt rubber mixtures have been used as pavement surface layers due to their ability to prevent early degradation, and are considered a sustainable option. This study performed analysis comparing the fatigue resistance of asphalt rubber mixtures of different combinations of asphalt bases, crumb rubber, and gradation, in order to estimate the performance of asphalt rubber mixtures as pavement surface layers. The methodology was developed in a laboratory and involved asphalt rubber production by continuous and terminal blend systems with different crumb rubbers and asphalt base types. Asphalt rubber mixtures with varying gradations and an unmodified asphalt mixture as a reference were produced. The mechanical behavior as a dynamic modulus and with respect to fatigue resistance was evaluated using a four-point bending test. In order to verify each of the asphalt rubber mixtures’ contribution as a surface layer, pavement structures were designed and their lifespans were compared. The findings showed that all asphalt rubber mixtures presented higher fatigue resistance than the reference. For pavement design, in comparison with the reference mixture, the thickness of the surface layer could be reduced by at least 50% while achieving the same life, proving its successful performance. This study demonstrated the effective contribution of crumb rubber from scrap tires as an asphalt modifier for producing sustainable mixtures with adequate fatigue performance.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma15238592