Background: Moisture damage and aging take place together in asphalt binder as it is on road-pavement in service life
and therefore quite difficult to overcome. Various techniques, such as crumb rubber, fibres, etc., have been applied to
improve the behaviour of asphalt materials Use of nano materials was found as one of the effective techniques to
develop temperature performances of asphalt binder.
Methods: This study investigated moisture damage and aging of asphalt binder mixing with the carbon nano tubes (CNTs) using
Atomic Force Microscopy (AFM). The base binder was primarily modified with 4% SBS polymer. Later on, CNTs were mixied in
different percentages (i.e., 0.5%, 1%, and 1.5%) by weight with the 4% styrene–butadiene–styrene (SBS) modified binders. A special
functionalized (-NH3) AFM probe with spring constant 3.44 N/m was utilised to complete the study.
Results: The results were compared with 4% SBS modified asphalt with and without CNT addition.The adhesion forces of dry
samples were found smaller as compared to wet and aged asphalt samples of with and without CNT. However, the adhesion forces of
wet and aged samples with investigated percentage of CNT performed considerably better than those without CNT.
Conclusion: This result clearly indicated significant improvement of asphalt to overcome moisture damage and aging owing to
exposure in outdoor environment as a paving material. This study recommends any dosage (i.e., 0.5 to 1.5% by weight) of CNT with
4% SBS modified asphalt to resist moisture damage and aging in field.