Journal
COLD REGIONS SCIENCE AND TECHNOLOGY
Volume 123, Issue -, Pages 115-120Publisher
ELSEVIER
DOI: 10.1016/j.coldregions.2015.12.006
Keywords
Side slope; Albedo; Reflectivity; Non-white pigment; Cold regions
Funding
- National Natural Science Foundation of China [41561015, 51508114]
- Science Foundation of Guangxi [2015GXNSFBA139212]
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Roadways in permafrost regions usually need embankments to disperse the traffic loadings to the underlying layer. Most roadway embankments have differential solar absorption across the embankment due to the slope-facing problem, which can cause longitudinal cracking along the roadway. This problem may be remedied by increasing the albedo of the sun-facing side slope because the solar absorption of the slope is the product of solar radiation and absorptivity (absorptivity = 1-albedo). This study fabricated eight embankment models with differential surface albedo on the one side slope. The albedo of the models was measured on June 22, 2015, by a proposed method for measuring the albedo of bent surfaces. It is found that raising the albedo of the side slope of the embankment can increase the embankment's albedo about 0 to 0.2. Therefore for the cold-region roadway embankments in the Northern Hemisphere, painting the southern side slope with highly reflective, non-white pigments can cool the roadbed and remedy the thermal asymmetry across the embankment. (C) 2015 Elsevier B.V. All rights reserved.
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