00666230

Component

http://onlinepubs.trb.org...trr/1994/1434/1434-008.pdf

https://scholar.google.co...hman&publication_year=1994

Independent researchers have shown that when compacted clays are subjected to freeze/thaw, they can undergo increases in hydraulic conductivity of one to three orders of magnitude. Existing data have shown that these changes are highly dependent on the initial (before freezing) hydraulic conductivity but not on the plasticity of the soil. The number of freeze/thaw cycles, state of stress, and rate of freezing have the greatest effect on the hydraulic conductivity. It has also been indicated that the availability of water during freezing is critical. In this study, it is shown for closed systems (those with no external water source) that the severity of damage to the soil during freeze/thaw correlates with the volume of water contained in the soil pores and with changes in the hydraulic conductivity. Soils compacted dry of optimum water content can be expected to undergo less than one order of magnitude change in hydraulic conductivity because of freeze/thaw, whereas those compacted wet of optimum can be expected to change by two or more orders. This difference in the magnitude of change suggests that to maintain hydraulic conductivities in compacted soils subjected to freeze/thaw, it may be necessary to compact them dry of optimum--a condition contrary to the practice of constructing low hydraulic conductivity barriers.

This paper appears in Transportation Research Record No. 1434, Subsurface Drainage, Soil-Fluid Interface Phenomena, and Management of Unpaved Surfaces. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01401242

English

p. 55-60

1994

Transportation Research Record

0309055113

Figures (6) ; References (21) ; Tables (4)

Compacted clays; Freeze thaw durability; Loss and damage; Moisture content; Permeability coefficient; Pore water

Damage severity

Geotechnology; Highways; I42: Soil Mechanics

TRIS, TRB

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