Journal
MEASUREMENT
Volume 78, Issue -, Pages 104-110Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.measurement.2015.09.055
Keywords
Gas permeability; Wetting condition; Buoyancy-driven convection; Rayleigh number; Root respiration; Evaporative cooling
Funding
- National Natural Science Foundation of China [51308135, 51268005]
- Scientific Research Foundation of Guangxi University [XGZ130237]
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A new, simple apparatus was developed to measure the gas permeability of pervious concrete. The apparatus was assembled to allow gas flowing through the pervious concrete sample in a pressure-steady manner. A vacuum was used to create a stable gas flow through the sample while the gas-flowing rate was gauged by a Venturi tube. The gas permeability was measured under different applied pressures and different sample-saturated conditions. It is found that the permeability of pervious concrete decreases with the applied pressure gradient but does not obey the Klinkenberg effect. The saturated degrees do not distinctively influence the gas permeability of the pervious concrete. The gas permeability varies from 10(-9) to 10(-10) m(2). This low permeability suggests that there is no buoyancy-driven convection inside the pervious pavements. This further implies that pervious pavements do not enhance the underlying root respiration and that the evaporation of the holding water in pervious pavements performs limited cooling effect. (C) 2015 Elsevier Ltd. All rights reserved.
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