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
Аутори
Stanić, FilipCui, Yu-Jun
Delage, Pierre
De Laure, Emmanuel
Versini, Pierre-Antoine
Schertzer, Daniel
Tchiguirinskaia, Ioulia
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
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, demonstratin...g the good perfor- mance 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, con- firming 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.
Кључне речи:
green-roof material / water retention / hydraulic conductivity / hanging column / axis translation / Gardner’s method / Kunze and Kirkham’s methodИзвор:
Geotechnical Testing Journal (GTJ), 2019, 43, 3Издавач:
- ASTM Compass
- ASTM International (American Society For Testing and Materials)
Колекције
Институција/група
GraFarTY - JOUR AU - Stanić, Filip AU - Cui, Yu-Jun AU - Delage, Pierre AU - De Laure, Emmanuel AU - Versini, Pierre-Antoine AU - Schertzer, Daniel AU - Tchiguirinskaia, Ioulia PY - 2019 UR - https://grafar.grf.bg.ac.rs/handle/123456789/3368 AB - 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 perfor- mance 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, con- firming 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. PB - ASTM Compass PB - ASTM International (American Society For Testing and Materials) T2 - Geotechnical Testing Journal (GTJ) T1 - 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 IS - 3 VL - 43 DO - 10.1520/GTJ20170443 ER -
@article{ author = "Stanić, Filip and Cui, Yu-Jun and Delage, Pierre and De Laure, Emmanuel and Versini, Pierre-Antoine and Schertzer, Daniel and Tchiguirinskaia, Ioulia", year = "2019", abstract = "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 perfor- mance 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, con- firming 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.", publisher = "ASTM Compass, ASTM International (American Society For Testing and Materials)", journal = "Geotechnical Testing Journal (GTJ)", 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", number = "3", volume = "43", doi = "10.1520/GTJ20170443" }
Stanić, F., Cui, Y., Delage, P., De Laure, E., Versini, P., Schertzer, D.,& Tchiguirinskaia, I.. (2019). 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. in Geotechnical Testing Journal (GTJ) ASTM Compass., 43(3). https://doi.org/10.1520/GTJ20170443
Stanić F, Cui Y, Delage P, De Laure E, Versini P, Schertzer D, Tchiguirinskaia I. 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. in Geotechnical Testing Journal (GTJ). 2019;43(3). doi:10.1520/GTJ20170443 .
Stanić, Filip, Cui, Yu-Jun, Delage, Pierre, De Laure, Emmanuel, Versini, Pierre-Antoine, Schertzer, Daniel, Tchiguirinskaia, Ioulia, "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" in Geotechnical Testing Journal (GTJ), 43, no. 3 (2019), https://doi.org/10.1520/GTJ20170443 . .