Abstract
Moisture susceptibility plays an important role in the damage of asphalt pavement. Failure occurs when asphalt is removed from the aggregate particles due to the decreased adhesion between the asphalt and aggregate in comparison with that between water and the aggregate. In recent years, efforts utilizing nanomaterials to improve the diverse properties of asphalt have proven to be effective. In this study, three types of nanoclays were used to modify styrene‐butadiene‐styrene‐ (SBS‐) modified asphalt. The resistances to water damage of the modified binders were evaluated using the surface free energy (SFE) and atomic force microscopy (AFM). The results revealed that the total SFE decreased and the energy ratio (ER) increased when the asphalt binder was modified with the nanoclays, indicating that the addition of nanoclays can improve the moisture resistance of these aggregate‐binder systems. After immersion, a decreased amount of bee structures was observed in both the SBS and nanoclay‐modified asphalts due to the interactions between water and bitumen. However, the residual amount of bee structures was higher in the nanoclay‐modified asphalts than in the SBS‐modified asphalt, indicating that the addition of nanoclay makes the surface morphology of asphalt more resistant to water damage. Finally, freeze‐thaw splitting tests were used to verify the results obtained through the SFE and AFM tests.
Highlights
Asphalt pavement is incessantly subjected to the combination of repeated vehicle loading and complex environmental loading throughout its years of service, resulting in cracking, rutting, and water damage to the asphalt surface [1,2]. ese forms of wear degrade the performance and reduce the service life of asphalt pavement, resulting in considerable economic losses [3].Moisture damage plays an important role in the damage of the asphalt pavement
To avoid or slow the process of water damage, a widely adopted measure is the modification of the asphalt or aggregates using various materials as modifiers to improve the performance of the asphalt mixture [7, 8]. e impact of using lime to modify asphalt was found to be capable of improving the moisture resistance of hot mix asphalt (HMA) mixtures [9]. e laboratory results of porous asphalt mixtures obtained by Jiao et al showed that the use of crumb rubber (CR) and tafpack super (TPS) could improve the resistance of styrene-butadiene-styrene- (SBS-) modified asphalt towards water damage [10]
Mamun and Arifuzzaman added a certain amount of carbon nanotubes (CNTs) to styrenebutadiene (SB) and styrene-butadiene-styrene (SBS) and Advances in Materials Science and Engineering found that the CNT-polymer-modified asphalt showed better resistance towards moisture damage than the corresponding polymer-modified asphalt [7]. e research of Das and Singh suggested that the contribution of the nanosized hydrated lime (NHL) filler was more significant than that of the regular-sized hydrated lime (RHL) filler in improving the bond strength and moisture resistance of asphalt mastic [16]
Summary
Asphalt pavement is incessantly subjected to the combination of repeated vehicle loading and complex environmental loading throughout its years of service, resulting in cracking, rutting, and water damage to the asphalt surface [1,2]. ese forms of wear degrade the performance and reduce the service life of asphalt pavement, resulting in considerable economic losses [3].Moisture damage plays an important role in the damage of the asphalt pavement. E research of Das and Singh suggested that the contribution of the nanosized hydrated lime (NHL) filler was more significant than that of the regular-sized hydrated lime (RHL) filler in improving the bond strength and moisture resistance of asphalt mastic [16]. It was revealed by Sezavar et al through a group method of data handling (GMDH) algorithm that nanosilica could improve the moisture stability of asphalt mixtures [17]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
