Subgrade Moisture & Temperature Variations Under Road Pavements in Virginia

Report No: 73-R29

Published in 1974

About the report:

In this investigation the changes in the subgrade moisture content under five road pavements ranging in age from new to about ten years old were determined and evaluated. The moisture content was determined by means of a nuclear moisture depth probe. This investigation has shown that: (1) the higher compaction and dry density of the subgrade soil, the lower is the moisture content; (2) the subgrade moisture content increases sharply from the beginning to the end of construction and then the rate of increase shows; (3)there is a sharp increase in moisture content - due to precipitation - within a year or two from the date of the construction of the subgrade, after which the rate of increase in moisture decreases; and (4) after about ten years there is very little increase in the subgrade moisture content.

Disclaimer Statement:The contents of this report reflect the views of the author(s), who is responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the Virginia Department of Transportation, the Commonwealth Transportation Board, or the Federal Highway Administration. This report does not constitute a standard, specification, or regulation. Any inclusion of manufacturer names, trade names, or trademarks is for identification purposes only and is not to be considered an endorsement.


  • N. K. Vaswani

Last updated: February 6, 2024

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