A Device for the Simultaneous Determination of the Water Retention Properties and the Hydraulic Conductivity Function of an Unsaturated Coarse Material; Application to a Green-Roof Volcanic Substrate
The determination of the water retention curve (WRC) and hydraulic conductivity function (HCF) of a specific volcanic coarse granular material used as a substrate for urban green roofs in Europe was carried out on a newly developed specific device in which low suctions, typical of coarse granular ma...
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| Veröffentlicht in: | Geotechnical testing journal 2020-05, Vol.43 (3), p.547-564 |
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| container_title | Geotechnical testing journal |
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| creator | Stanić, Filip Cui, Yu-Jun Delage, Pierre De Laure, Emmanuel Versini, Pierre-Antoine Schertzer, Daniel Tchiguirinskaia, Ioulia |
| description | The determination of the water retention curve (WRC) and hydraulic conductivity function (HCF) of a specific volcanic coarse granular material used as a substrate for urban green roofs in Europe was carried out on a newly developed specific device in which low suctions, typical of coarse granular materials, were controlled. Smaller suctions (up to 32 kPa) were imposed by using a hanging column system, and larger suctions (between 32 and 50 kPa) were imposed by using the axis translation technique in the same cell. The changes in suction during the tests were monitored by using a high accuracy differential pressure transducer. They were also used to determine the HCF by means of both Kunze and Kirkham’s and Gardner’s methods. The former technique was used at low suctions ( |
| doi_str_mv | 10.1520/GTJ20170443 |
| format | Article |
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Smaller suctions (up to 32 kPa) were imposed by using a hanging column system, and larger suctions (between 32 and 50 kPa) were imposed by using the axis translation technique in the same cell. The changes in suction during the tests were monitored by using a high accuracy differential pressure transducer. They were also used to determine the HCF by means of both Kunze and Kirkham’s and Gardner’s methods. The former technique was used at low suctions (<4 kPa) to account for the impedance effects due to the high air entry value ceramic porous disk and the latter was used between 4 and 50 kPa. Good comparability was observed in the data from both methods, demonstrating the good performance of the device. The mathematical expressions of the WRC of van Genuchten and Brooks and Corey were used, and a good fitting with our experimental data was obtained. Conversely, the HCFs derived from these expressions appeared to lead to a significant underestimation, confirming the need of an operational and simple device for the experimental determination of the HCF. Also, this material proved to be an appropriate material for green urban infrastructures, because of its lightweight, satisfactory water retention capability and hydraulic conductivity.</description><identifier>ISSN: 0149-6115</identifier><identifier>EISSN: 1945-7545</identifier><identifier>DOI: 10.1520/GTJ20170443</identifier><identifier>CODEN: GTJODJ</identifier><language>eng</language><publisher>ASTM International</publisher><subject>Engineering Sciences ; green-roof material, water retention, hydraulic conductivity, hanging column, axis translation, Gardner’s method, Kunze and Kirkham’s method ; Mechanics ; Mechanics of materials</subject><ispartof>Geotechnical testing journal, 2020-05, Vol.43 (3), p.547-564</ispartof><rights>All rights reserved. This material may not be reproduced or copied, in whole or part, in any printed, mechanical, electronic, film, or other distribution and storage media, without the written consent of the publisher.</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a337t-d1d269b7a1136c2158bf1ca45616405ec1599aa4366cda112a00b65c4763214d3</citedby><cites>FETCH-LOGICAL-a337t-d1d269b7a1136c2158bf1ca45616405ec1599aa4366cda112a00b65c4763214d3</cites><orcidid>0000-0003-0271-5993 ; 0000-0002-2101-5522 ; 0000-0003-4930-5115 ; 0000-0003-1886-3923 ; 0000-0001-8041-2184</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,776,780,881,9772,27901,27902</link.rule.ids><backlink>$$Uhttps://enpc.hal.science/hal-03045911$$DView record in HAL$$Hfree_for_read</backlink></links><search><contributor>Likos, William J.</contributor><creatorcontrib>Stanić, Filip</creatorcontrib><creatorcontrib>Cui, Yu-Jun</creatorcontrib><creatorcontrib>Delage, Pierre</creatorcontrib><creatorcontrib>De Laure, Emmanuel</creatorcontrib><creatorcontrib>Versini, Pierre-Antoine</creatorcontrib><creatorcontrib>Schertzer, Daniel</creatorcontrib><creatorcontrib>Tchiguirinskaia, Ioulia</creatorcontrib><title>A Device for the Simultaneous Determination of the Water Retention Properties and the Hydraulic Conductivity Function of an Unsaturated Coarse Material; Application to a Green-Roof Volcanic Substrate</title><title>Geotechnical testing journal</title><description>The determination of the water retention curve (WRC) and hydraulic conductivity function (HCF) of a specific volcanic coarse granular material used as a substrate for urban green roofs in Europe was carried out on a newly developed specific device in which low suctions, typical of coarse granular materials, were controlled. Smaller suctions (up to 32 kPa) were imposed by using a hanging column system, and larger suctions (between 32 and 50 kPa) were imposed by using the axis translation technique in the same cell. The changes in suction during the tests were monitored by using a high accuracy differential pressure transducer. They were also used to determine the HCF by means of both Kunze and Kirkham’s and Gardner’s methods. The former technique was used at low suctions (<4 kPa) to account for the impedance effects due to the high air entry value ceramic porous disk and the latter was used between 4 and 50 kPa. Good comparability was observed in the data from both methods, demonstrating the good performance of the device. The mathematical expressions of the WRC of van Genuchten and Brooks and Corey were used, and a good fitting with our experimental data was obtained. Conversely, the HCFs derived from these expressions appeared to lead to a significant underestimation, confirming the need of an operational and simple device for the experimental determination of the HCF. 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| identifier | ISSN: 0149-6115 |
| ispartof | Geotechnical testing journal, 2020-05, Vol.43 (3), p.547-564 |
| issn | 0149-6115 1945-7545 |
| language | eng |
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| source | ASTM Journals |
| subjects | Engineering Sciences green-roof material, water retention, hydraulic conductivity, hanging column, axis translation, Gardner’s method, Kunze and Kirkham’s method Mechanics Mechanics of materials |
| title | A Device for the Simultaneous Determination of the Water Retention Properties and the Hydraulic Conductivity Function of an Unsaturated Coarse Material; Application to a Green-Roof Volcanic Substrate |
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