Relationship between Specific Surfaces and Secondary Properties of Residual Soils

Studies on physical properties of residual soils (4)

Abstract

Secondary properties of residual soils are influenced by their fundamental properties and that to a great extent especially by specific surfaces of the latter. In this study, the relationship between specific surfaces and secondary properties (consistency, water retentivity and compaction property) of residual granitic, dioritic, rhyoritic and andesitic soils was examined.
The results are summarized as follows:
1) Consistency:
Liquid limit, plastic limit and plasticity index are closely related to the specific surface.
2) Water retentivity:
Moisture content equivalent to pF 1.8, 3.0 and 4.2 each is closely related to the specific surface.
3) Compaction property:
Optimum moisture content, maximum dry density and steepness are closely related to the specific surface.
It is thought that the difference in compacted soil structure may also be reflected in the relationship between pF value and molding moisture content.