An approximate analytical solution for measuring air permeability of asphalt samples partially saturated with water |
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| Authors: | Hailong Li Yuchen Zhang Yuqiang Xia |
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| Institution: | (1) School of Water Resources and Environmental Science, China University of Geosciences-Beijing, 29 Xue Yuan Road, Haidian District, Beijing, 100083, People’s Republic of China;(2) Anqiu Experimental High School, Anqiu, 262100, Shandong, People’s Republic of China;(3) School of Environmental Studies and (MOE) Biogeology and Environmental Geology Lab, China University of Geosciences, Wuhan, 430074, People’s Republic of China |
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| Abstract: | In coastal areas, abnormally high pressure may be caused by the tide-induced water table variation under extensive pavements,
particularly during rainfall. To simulate the rainfall infiltration effects on the air permeability of asphalt pavements in
coastal area, column-shaped asphalt sample was fixed in the upper part of a steel cylinder with its upper surface saturated
with ponding water (depth < 5 mm) and open to the atmosphere. The cylinder’s lower part formed an air chamber. The chamber
was pressurized and then the air therein was released naturally through the sample. The pressure variation with time in the
chamber was recorded for analysis. Based on the Green–Ampt piston model for the surface water infiltration, an approximate
analytical solution was derived to describe the pressure–time relationship in the chamber. A new parameter called the escape
pressure was introduced to describe the air pressure needed for the chamber air to break through the capillary pressure induced
by the ponding water. The analytical solution gave good estimations of both the escape pressures and the harmonic averages
of the permeabilities of the wet and dry parts of 14 samples in the sense that excellent fittings were obtained between the
observed and predicted air pressures in the air chamber. The estimated escape pressure ranges from 0.0 to 1.74 kPa. The harmonic
average of the permeabilities of the wet and dry parts is 5–94% of the dry sample’s permeability. |
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