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ABSTRACT
Asphalt pavements are generally more susceptible to rutting under high temperatures, which can be further exacerbated by prolonged solar exposure and thermal absorption. The continuous thermal radiation from the asphalt pavement could aggravate the urban heat island effect and negatively impact urban life. To address this problem, this study was conducted to develop and evaluate a thermal-reflective coating material that minimizes thermal absorption and enhances the cooling effects of asphalt pavements. As documented herein, three pigment fillers were comparatively assessed in terms of their ability to enhance thermal reflectance, namely Hollow Glass Beads (HGB), Rutile Titanium Dioxide (RTD), and Potassium Titanate Whiskers (PTW). Acrylic resin (AR) and epoxy resin (ER) served as the base binding materials, while Polyamide acted as the curing agent. The performance of these materials was analyzed through various tests, including tensile strength, indoor cooling simulation, outdoor (field) cooling, and Differential Scanning Calorimetry (DSC)measurements. The corresponding results indicated that the optimum composition for the coating materials consist of: (1) base materials (namely 50% AR and 50% ER); (2) pigment fillers (namely 25% HGB, 20% RTD, and 15% PTW); and (3) curing agent (namely 40% Polyamide), with 2 mm as the optimum coating thickness to minimize thermal absorption.
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ASSOCIATE EDITOR:
Nomenclature
| AR | = | Acrylic resin |
| c | = | the control group curve |
| C | = | the cooling effect |
| DSC | = | Differential scanning calorimetry |
| Eb | = | the elongation at break of the tested specimens |
| ER | = | Epoxy resin |
| Fm | = | the maximum recorded tension stress |
| HGB | = | Hollow glass beads |
| L0 | = | the distance between the initial marks of the specimen |
| Lb | = | the distance between marks at break of the specimen |
| Mx | = | the time and temperature curve integral |
| Mc | = | the time and temperature control curve integral |
| PTW | = | Potassium titanate whiskers |
| RTD | = | Rutile titanium dioxide |
| t | = | the thickness of the middle part of the specimen |
| t0 | = | the initial start time of the test |
| t1 | = | the end time of the test |
| Tg | = | the glass transition temperature |
| TS | = | the tensile strength of the tested specimens |
| W | = | the width of the middle part of the test specimens |
| x | = | the dosage of hollow glass beads by weight of the resin |
Acknowledgments and Disclaimer
The authors appreciate the financial support from the Nature Science Foundation of Changsha(kq2007025). Special thanks and due gratitude also go to the reviewers for their valuable comments and suggestions concerning our manuscript.
The contents of this paper (which is not a standard nor specification) reflect the views of the authors who are solely responsible for the facts and accuracy of the data presented herein and do not necessarily reflect the official views or policies of any agency or institute. Trade names were used solely for information purposes and not for product endorsement, advertisement, promotions, or certification.
Disclosure statement
No potential conflict of interest was reported by the author(s).