Author(s): Daba S. Gedafa, Daniel Landrus, Nabil Suleiman
Published in: International Journal of Engineering Research & Technology
License: This work is licensed under a Creative Commons Attribution 4.0 International License.
Volume/Issue: Volume. 5 - Issue. 05 , May - 2016
Even though engineers are interested in the material properties at the macro- and mesoscales, the phenomena at nano- and micro-scales provide fundamental insight for the underlying interactions defining the physio-chemical behavior of materials. Nanomaterials possess extraordinary potential for improving the performance of asphalt mixtures. The rutting resistance of a nanoclay modified mixture may be improved due to the change in binder microstructure. The main objective of this study is to investigate the effect of nanoclay content on the rutting resistance of hot mix asphalt (HMA) mixes. Four different binder grades (PG 58-28, PG 58-34, PG 64-28, and PG 64-34) and nanoclay contents (0%, 1%, 3%, and 5%) have been considered. A gyratory compactor was used to compact 48 specimens. The rutting resistance of the specimens was tested using an Asphalt Pavement Analyzer (APA) under dry conditions. An independent t-test was used to determine statistically significant differences in the rutting resistance of the different mixes. Nanoclay content has the most and no significant effect in increasing rutting resistance of PG 58-28 and PG 64-34 based mixes, respectively. The higher the nanoclay content, the lower the rate of progression of rutting. There is no significant difference between the rutting resistance of all the mixes with 0% (control) and 1% nanoclay content at all numbers of passes. There is no significant difference between the rutting resistances of mixes with the different binder grades at 5% nanoclay content.
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