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Title:

MOISTURE IN PORTLAND CEMENT CONCRETE

Accession Number:

00468686

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309045010

Abstract:

Moisture gradients in concrete pavements cause differential shrinkage between the top and the bottom of the pavement. This leads to curling stresses in which the top of the pavement is in tension while the bottom is in compression. The magnitude of these stresses is determined by the moisture distribution, the volumetric aggregate content of the concrete, and the elastic modulus of the concrete. Pavement moisture contents were determined by field moisture measurements, laboratory measurements, and computer simulation. These indicated that substantial drying occurred only at the top surface, to a depth of less than 2 inches. The rest of the pavement remained at 80 percent saturation or higher. A typical pavement moisture distribution was determined, and using an aggregate content of 74 percent and an elastic modulus of 3.6 x 1,000,000 psi, a stress distribution was calculated. The tensile strength of the concrete at the surface was exceeded, and cracks could be expected to form to a depth of 3/4 inches. Because the tension in the concrete was concentrated near the surface instead of decreasing linearly with depth, the actual moment in the pavement caused by the moisture gradient was only 40 percent of the moment capacity of the unreinforced concrete.

Supplemental Notes:

Publication of this paper sponsored by Committee on Strength and Deformation Characteristics of Pavement Sections. 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

Monograph Accession #:

01418084

Authors:

Janssen, Donald J

Pagination:

pp 40-44

Publication Date:

1987

Serial:

Transportation Research Record

Issue Number: 1121
Publisher: Transportation Research Board
ISSN: 0361-1981

Conference:

66th Annual Meeting of the Transportation Board

Location: Washington District of Columbia, United States
Date: 1987-1-12 to 1987-1-15

ISBN:

0309045010

Media Type:

Print

Features:

Figures (11) ; References (11) ; Tables (3)

Uncontrolled Terms:

Field measurements

Old TRIS Terms:

Subject Areas:

Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways

Files:

TRIS, TRB, ATRI

Created Date:

May 31 1988 12:00AM

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