Abstract
Utilizing the self-healing properties of asphalt materials is a way to improve the service life of asphalt pavements. Enhanced self-healing capabilities can be achieved through mixture modification. Using waste or by-product materials to modify asphalt mixtures can provide further environmental benefits. However, with a given mixture modification method, the resulting materials should be adequately vetted to ensure that enhanced self-healing capability is not attained at the expense of the mixture’s overall performance. This research aims to investigate the feasibility of using zinc slag filler to enhance the self-healing properties of warm mix asphalt (WMA) and evaluates the rutting susceptibility and moisture-resistance of the slag-modified mixtures. To this end, zinc slag filler was used to replace a portion of the mineral filler at different replacement rates in WMA mixtures. Self-healing capabilities of the resulting mixtures were studied under microwave induction heating. The influence of zinc slag modification on asphalt mixture’s characteristics and conventional performance indicators were evaluated by the Texas boiling test, the three-point bending test, and the Kim test (a deformation test). Also, the adhesion between bitumen and aggregate was evaluated using the broken sample from the three-point bending test and digital image analysis. The results of self-healing tests demonstrated that the heat generation capability of the specimens increased with filler replacement rate, such that the specimens with 100% of the mineral filler replaced with slag showed the highest heating performance. Zinc slag filler showed the potential to improve the moisture resistance of WMA by enhancing aggregate–bitumen adhesion and thus reducing stripping. The slag-modified WMA samples exhibited better tensile strength ratio (TSR) and deformation resistance than their non-modified equivalents.
Highlights
Introduction published maps and institutional affilUtilizing waste or by-product materials in asphalt pavements for functional, environmental, or economic benefits has been long studied and encouraged
This study investigated how the healing capability of warm mix asphalt (WMA) mixture under microwave induction heating and performance characteristics were influenced if the mineral filler is partially or entirely replaced with zinc slag
Performance was evaluated in terms of indicators representing rutting susceptibility, and moisture resistance
Summary
Utilizing waste or by-product materials in asphalt pavements for functional, environmental, or economic benefits has been long studied and encouraged. Some recycled materials such as recycled asphalt pavement (RAP) and recycled asphalt shingle (RAS). Various types of relatively unconventional or less common waste, by-product, or otherwise recycled materials such as waste tire thread mesh, recycled waste lime, municipal solid waste incineration ash, waste foundry sand, recycled carbon fiber, and different metallic waste/by-product metallic materials have been used to modify asphalt-based composites for different purposes [2–9]. Modified asphalt materials are primarily made to achieve improved performance characteristics; asphalt-modifying agents can impart to the composite new properties.
Sign-in/Register to view highlights & summary 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.
