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Article: A falling-pressure method for measuring air permeability of asphalt in laboratory

TitleA falling-pressure method for measuring air permeability of asphalt in laboratory
Authors
KeywordsAir flow
Air permeability
Analytical solution
Falling-pressure method
Inverse problem
Numerical solution
Issue Date2004
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jhydrol
Citation
Journal Of Hydrology, 2004, v. 286 n. 1-4, p. 69-77 How to Cite?
AbstractThis paper presents a simple analytical solution for estimating air permeability using the test data obtained by a falling-pressure method in laboratory. The perimeter of the column-shaped sample is fixed in a steel cylinder with the upper sample surface open to the atmosphere. The lower surface of the sample and the cylinder form an air chamber. A water manometer is connected to the air chamber to measure the air pressure inside after the chamber is pressurized. The data of pressure versus time in the air chamber are recorded and analyzed. An approximate analytical solution is derived to describe the pressure-time relationship in the air chamber. The air permeability can be easily estimated using the approximate analytical solution based on the linear least-squares fitting to the recorded pressure-time test data. This method is used to estimate the falling-pressure test data of 15 asphalt samples. The agreement between the test data and the analytical prediction is satisfactory for all the samples. To investigate the error caused by the approximate analytical solution, the air permeabilities are also estimated based on fully numerical solutions. The permeability values obtained from analytical and numerical solutions are very close. The maximum relative error is less than 6% for samples with more than five pressure-time records. A quantitative condition is given under which the analytical solution applies with negligible estimation error. Compared with the common, steady-state method for measuring air permeability, the falling-pressure method has its advantages such as simplicity and economy. The steady-state method has to measure the air flux through the sample, while the falling-pressure method does not. © 2003 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/72786
ISSN
2015 Impact Factor: 3.043
2015 SCImago Journal Rankings: 1.743
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLi, Hen_HK
dc.contributor.authorJiao, JJen_HK
dc.contributor.authorLuk, Men_HK
dc.date.accessioned2010-09-06T06:45:05Z-
dc.date.available2010-09-06T06:45:05Z-
dc.date.issued2004en_HK
dc.identifier.citationJournal Of Hydrology, 2004, v. 286 n. 1-4, p. 69-77en_HK
dc.identifier.issn0022-1694en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72786-
dc.description.abstractThis paper presents a simple analytical solution for estimating air permeability using the test data obtained by a falling-pressure method in laboratory. The perimeter of the column-shaped sample is fixed in a steel cylinder with the upper sample surface open to the atmosphere. The lower surface of the sample and the cylinder form an air chamber. A water manometer is connected to the air chamber to measure the air pressure inside after the chamber is pressurized. The data of pressure versus time in the air chamber are recorded and analyzed. An approximate analytical solution is derived to describe the pressure-time relationship in the air chamber. The air permeability can be easily estimated using the approximate analytical solution based on the linear least-squares fitting to the recorded pressure-time test data. This method is used to estimate the falling-pressure test data of 15 asphalt samples. The agreement between the test data and the analytical prediction is satisfactory for all the samples. To investigate the error caused by the approximate analytical solution, the air permeabilities are also estimated based on fully numerical solutions. The permeability values obtained from analytical and numerical solutions are very close. The maximum relative error is less than 6% for samples with more than five pressure-time records. A quantitative condition is given under which the analytical solution applies with negligible estimation error. Compared with the common, steady-state method for measuring air permeability, the falling-pressure method has its advantages such as simplicity and economy. The steady-state method has to measure the air flux through the sample, while the falling-pressure method does not. © 2003 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jhydrolen_HK
dc.relation.ispartofJournal of Hydrologyen_HK
dc.rightsJournal of Hydrology. Copyright © Elsevier BV.en_HK
dc.subjectAir flowen_HK
dc.subjectAir permeabilityen_HK
dc.subjectAnalytical solutionen_HK
dc.subjectFalling-pressure methoden_HK
dc.subjectInverse problemen_HK
dc.subjectNumerical solutionen_HK
dc.titleA falling-pressure method for measuring air permeability of asphalt in laboratoryen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0022-1694&volume=286 Issues 1-4&spage=P69&epage=77 &date=2004&atitle=A+falling-pressure+method+for+measuring+air+permeability+of+asphalt+in+laboratoryen_HK
dc.identifier.emailJiao, JJ:jjiao@hku.hken_HK
dc.identifier.authorityJiao, JJ=rp00712en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jhydrol.2003.09.013en_HK
dc.identifier.scopuseid_2-s2.0-1142281996en_HK
dc.identifier.hkuros91480en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-1142281996&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume286en_HK
dc.identifier.issue1-4en_HK
dc.identifier.spage69en_HK
dc.identifier.epage77en_HK
dc.identifier.isiWOS:000188887100005-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridLi, H=35769216800en_HK
dc.identifier.scopusauthoridJiao, JJ=7102382963en_HK
dc.identifier.scopusauthoridLuk, M=6506638701en_HK

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