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Title:

MOISTURE ACCUMULATION AND PORE WATER PRESSURES AT BASE OF PAVEMENTS

Accession Number:

00731139

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

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Order URL: http://worldcat.org/isbn/0309059518

Abstract:

A unique mechanism based on extensive field and laboratory studies is presented to account for certain premature failures of flexible pavements in cold areas like those in Scandinavia and in northern parts of Canada and the United States. Water condensing at the interface between pavement and granular base accumulates at subzero temperatures resulting in excess moisture in this zone. During the thaw period of the uppermost base layer, the excess water in the aggregate is trapped between impervious layers of frozen ground to the sides and below as well as an impervious layer of asphalt pavement above. Because of this containment, high pore water pressures can occur, leading to loss in shear strength of the base material and thus to failure of the pavement structure itself. It was found that under special conditions, excess moisture can accumulate in granular base with a silt content greater than 20% and very high pore water pressures can develop during initial thaw at the pavement-soil interface. With silt contents of less than 2%, excess pore water pressures can be avoided during thaw. It was also shown that when a clean open gravel is placed below the pavement on top of a silty base material, moisture accumulation near the pavement-base interface can be prevented, and thus also the development of high pore water pressures.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1546, Issues in Geotechnical Engineering Research.

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

EIGENBROD, K D
Kennepohl, GJA

Pagination:

p. 151-161

Publication Date:

1996

Serial:

Transportation Research Record

Issue Number: 1546
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309059518

Features:

Figures (12) ; References (11)

Uncontrolled Terms:

Silt content; Structural failures

Old TRIS Terms:

Subject Areas:

Design; Geotechnology; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces; I42: Soil Mechanics

Files:

TRIS, TRB

Created Date:

Feb 3 1997 12:00AM

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