| Leaching from granular cement-based materials during infiltration/wetting coupled with freezing and thawing. | |
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MedLine Citation:
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PMID: 18439744 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Many secondary materials are being considered for use as substitutes for natural aggregates in highway applications due to their suitable engineering and economic properties. During the design life of the application, recycled materials are exposed to freeze/thaw cycles and other aging processes such as carbonation, coupled with intermittent infiltration/wetting by precipitation events. In such scenarios, leaching of material constituents is a primary pathway for environmental impact. This paper presents results of the effect of freezing and thawing on the leaching behavior of major and minor constituents from a laboratory formulated granular cement-based material. Scenarios considered included water percolating through the material (flow-through) and run-off (flow-around), both important leaching pathways in highway environments. The effect of moisture content at the time of freezing, number of freeze/thaw (F/T) cycles, and material size reduction were investigated. F/T exposure and subsequent infiltration/wetting resulted in consolidation and self-cementing of the granular cement-based material. For the flow-around scenario, F/T exposure resulted in a reduction in constituent release with time and increasing F/T cycles. For the flow-through scenario, moisture content at the time of freezing was an important parameter and an increase in the release was initially observed due to preferential flow/cracks and/or constituent redistribution prior to a decrease that resulted from self-cementing during further thawing and percolation. |
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Authors:
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F Sanchez; M K Langley White; A Hoang |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-04-24 |
Journal Detail:
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Title: Journal of environmental management Volume: 90 ISSN: 0301-4797 ISO Abbreviation: J. Environ. Manage. Publication Date: 2009 Feb |
Date Detail:
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Created Date: 2008-11-25 Completed Date: 2009-02-19 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0401664 Medline TA: J Environ Manage Country: England |
Other Details:
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Languages: eng Pagination: 983-93 Citation Subset: IM |
Affiliation:
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Department of Civil & Environmental Engineering, Vanderbilt University, Nashville, TN 37235, USA. florence.sanchez@vanderbilt.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Analysis of Variance Construction Materials* Freezing* Transportation Wettability |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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