Mitigation of Urban Heat Island Effects by Thermochromic Asphalt Pavement

Asphalt road pavements are usually dark and, consequently, have a low albedo. Therefore, they absorb energy as heat, increasing the Urban Heat Island (UHI) effect, which impacts the environment, energy consumption, and human health. Through the functionalization with thermochromic materials (TM), th...

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Bibliographic Details
Published in:Coatings (Basel) 2023-01, Vol.13 (1), p.35
Main Authors: Lima, Orlando, Freitas, Elisabete, Cardoso, Pedro, Segundo, Iran Rocha, Margalho, Élida, Moreira, Luís, O. Nascimento, José Heriberto, Landi, Salmon, Carneiro, Joaquim
Format: Article
Language:English
Subjects:
Accelerated tests
Aqueous solutions
Asphalt mixes
Asphalt pavements
Color
Colorimetry
Dyes
Energy
Energy absorption
Energy consumption
Environmental impact
Epoxy resins
Fourier transforms
Heat
Luminosity
Radiation
Substrates
Temperature
Urban heat islands
Wear resistance
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Summary:Asphalt road pavements are usually dark and, consequently, have a low albedo. Therefore, they absorb energy as heat, increasing the Urban Heat Island (UHI) effect, which impacts the environment, energy consumption, and human health. Through the functionalization with thermochromic materials (TM), this work aims to develop a smart asphalt pavement able to change its surface color, increasing the reflectance, and thus mitigate this phenomenon. To achieve this goal, asphalt substrates were functionalized by a surface spray coating of a thermochromic solution (TS) containing aqueous solution of thermochromic microcapsules (thermocapsules), dye, and epoxy resin. To evaluate the functionalization features, Fourier Transform Infrared Spectroscopy (FTIR), and Thermal Differential test (TDT) with cyclic temperature variation were performed in the functionalized asphalt binder. Moreover, Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray Spectrometry (EDS), a Quick Ultraviolet Accelerated Weathering Test (QUV) with Colorimetry test, and an adaptation of the Accelerated Polishing Test (APT) were performed on the functionalized asphalt mixture. The results indicate that the functionalization of asphalt substrates with TS exhibits a reversible color-change ability, higher luminosity values when subjected to temperatures above 30 °C, and wear resistance.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings13010035