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The effects of intermittent unsaturated wetting on the release of constituents from construction demolition debris

  • When used in highway applications, granular materials are submitted to changing environmental conditions. While column testing can provide a closer approximation to field percolation conditions than batch testing, there is still a need to develop column testing procedures that more closely approximate realistic conditions. Current column studies are conducted under continuously saturated conditions, without considering unsaturated intermittent flow conditions that exist in the field in response to precipitation events. This study evaluates the effect of different types of column flow on the release of constituents from a granular material. Two different types of intermittent unsaturated flow were studied and compared to continuously saturated flow. Leaching data, including pH, conductivity, and constituent release was compared from the three types of columns. Results showed that there is no difference between the two types of intermittent unsaturated flow, nor is there a significantWhen used in highway applications, granular materials are submitted to changing environmental conditions. While column testing can provide a closer approximation to field percolation conditions than batch testing, there is still a need to develop column testing procedures that more closely approximate realistic conditions. Current column studies are conducted under continuously saturated conditions, without considering unsaturated intermittent flow conditions that exist in the field in response to precipitation events. This study evaluates the effect of different types of column flow on the release of constituents from a granular material. Two different types of intermittent unsaturated flow were studied and compared to continuously saturated flow. Leaching data, including pH, conductivity, and constituent release was compared from the three types of columns. Results showed that there is no difference between the two types of intermittent unsaturated flow, nor is there a significant difference between these two flows and continuously saturated flow, other than higher initial concentrations of salts in intermittent unsaturated flow column testing at low LS ratios. However, this difference is not significant after a LS ratio of 2mL/g. Release of constituents was similar in all three cases. Also, all three cases show that after a LS ratio of 5mL/g there is no significant change in the pH, conductivity or release of constituents.zeige mehrzeige weniger

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Metadaten
Autor*innen:Sarynna Lopez Meza, H. van der Sloot, D.S. Kosson
Dokumenttyp:Zeitschriftenartikel
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Environmental engineering science
Jahr der Erstveröffentlichung:2009
Verlag:Liebert
Verlagsort:Larchmont, NY
Jahrgang/Band:26
Ausgabe/Heft:3
Erste Seite:463
Letzte Seite:469
Freie Schlagwörter:Column tests; Intermittent flow; Leaching
DOI:10.1089/ees.2007.0337
ISSN:1092-8758
ISSN:1557-9018
Verfügbarkeit des Dokuments:Weder Datei noch physisches Exemplar vorhanden ("No Access")
Datum der Freischaltung:19.02.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:01.03.2010
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