Carbon nanotubes (CNTs) in asphalt binder: Homogeneous dispersion and performance enhancement

ul Haq, M, Ahmad, N, Nasir, M, , J, Hafeez, M, Rafi, J, Zaidi, S and Haroon, W 2018, 'Carbon nanotubes (CNTs) in asphalt binder: Homogeneous dispersion and performance enhancement', Applied Sciences, vol. 8, no. 12, pp. 1-19.


Document type: Journal Article
Collection: Journal Articles

Title Carbon nanotubes (CNTs) in asphalt binder: Homogeneous dispersion and performance enhancement
Author(s) ul Haq, M
Ahmad, N
Nasir, M
, J
Hafeez, M
Rafi, J
Zaidi, S
Haroon, W
Year 2018
Journal name Applied Sciences
Volume number 8
Issue number 12
Start page 1
End page 19
Total pages 19
Publisher MDPIAG
Abstract Conventional binders cannot meet the current performance requirements of asphaltic pavements due to increase in traffic volumes and loads. Nanomaterials, due to their exceptional mechanical properties, are gaining popularity as bitumen modifiers to enhance the performance properties of the asphaltic concrete. Carbon Nanotubes (CNTs) are one of the most widely used nanomaterials because of their strength properties, light weight, small size, and large surface area. CNT addition results in improved substrate characteristics as compared to other modifiers. Due to high length to diameter ratio, dispersion of CNTs in bitumen is a complex phenomenon. In this study, dispersion of CNTs in bitumen was carried out using both dry and wet mixing techniques, the latter was selected on the basis of homogeneity of the resultant asphalt mixture. Scanning Electron Microscopy (SEM) was used to check the dispersion of CNTs in binder while Fourier Transform Infrared Spectroscopy (FTIR) was carried out to ensure the removal of solvent used for wet mixing. Conventional bitumen tests (penetration, softening point, and ductility), dynamic shear rheometer tests, rolling bottle tests, and bitumen bond strength tests were employed to check the improvement in the rheological and adhesion properties of bitumen while wheel tracker test was used to check the improvement in resistance against permanent deformation of asphalt mixtures after addition of CNTs. Results show that CNTs improved the higher temperature performance and permanent deformation resistance in both binder and mixtures. Improvement in bitumen-aggregate adhesion properties and moisture resistance was also observed.
Subject Construction Materials
Keyword(s) Adhesion
Bitumen
Carbon Nanotubes (CNTs)
Homogeneous dispersion
Rutting
Wet mixing
DOI - identifier 10.3390/app8122651
Copyright notice © 2018 by the authors. Licensee MDPI, Basel, Switzerland. Creative Commons Attribution (CC BY) license
ISSN 2076-3417
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