Abstract
Construction of earth structures involves the use of compacted soils. In roads construction quality controls like the bearing capacity of the subgrade, base and subbase layers, CBR values and compaction characteristics are primarily important. In Sweden, it has become interesting to correlate new testing parameters collected by simple tests to the conventional compaction parameters collected from modified Proctor tests. This action will help in assessing the bearing capacity of the selected material simply and quickly using the recent developed techniques instead of the conventional techniques which have been considered as time consuming methods. The aim of this study is to demonstrate that the laboratory dynamic California bearing ratio (CBRLD) test can be used as a method of compaction assessment of selected subgrade soil. Moreover, it has been demonstrated in this study that the CBRLD can strongly be correlated to the compaction densities and molding water contents using polynomial correlation and a best-fit multiple regression model for a wide range of molding water contents. In addition, the repeatability of the dynamic laboratory CBR test was examined as discussed in the current article.
Highlights
Soil compaction is the process whereby soil is mechanically compressed through a reduction in the air voids [22]
Note that in order to correlate the CBRLD to the compaction characteristics, it has become necessary to examine first the repeatability of the laboratory dynamic CBR test in order to decide which C BRLD value will be chosen for the correlation analysis
It is clear from this figure that the highest increase is found between the CBRLD conducted from the first drop and the CBRLD conducted from the second drop for all the tested CBR samples at different molding water content
Summary
Soil compaction is the process whereby soil is mechanically compressed through a reduction in the air voids [22]. It is one of the basic construction procedures used in building subgrades and bases for roads and airport pavements, embankments, earth-fill dams, and other similar structures [13, 15, 20]. The impact compaction laboratory methods are the ones most commonly used to establish the compaction characteristics of unbound materials. These methods involve compacting a sample of the material to be used in the field in a standard mold using a drop hammer [11]
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