Soil Air Voids Method for Compaction Control

Résumé du livre

This research project was structured to evaluate the air voids method as a means of assessing the quality of a compacted layer of soil. A literature review was conducted to examine existing published information on the air voids method and to explore how extensively others have used the method. Laboratory testing was conducted to gather information for a variety of soils and to identify potentially suitable and potentially problematic soil types. The laboratory testing program included particle size gradation, hydrometer, Atterberg limits, relative density, specific gravity and impact compaction tests. Data from over 20 Montana Department of Transportation soil survey reports was collected, categorized, and reviewed to statistically examine trends in regards to compaction parameters and the use of the air voids method. The advantages of the air voids method lie in its practicality and ease of use. However, based on the testing and analyses conducted, it is clear that this method should be considered applicable on a limited basis, only. Results from this study indicate that the air voids method of compaction control should not be used on a project unless the relationship between air voids and percent relative compaction is carefully established. The approach should only be considered on projects that have been thoroughly evaluated during the soil survey study using recommendations described in this report as guidelines.