Residual Soils Derived from Charnockite and Migmatite as Road Pavement Layer Materials

摘要

Suitable soils for road pavement layer construction are getting depleted. Highway Engineers are consistently in search of locally-available and suitable soils for road construction. This paper investigates the potential use of residual soils derived from charnockite and migmatite as road pavement layer materials. Natural moisture content, sieve and hydrometer analyses, specific gravity, Atterberg limits, compaction, California bearing ratio (CBR), and permeability characteristics of soil samples collected from six different locations in Ekiti State, Nigeria were determined. The soils derived from charnockite have their average unsoaked CBR, soaked CBR and permeability to be higher than those of the soils derived from migmatite by 64.7%, 73.5% and 1750.9%, respectively. Consequently, some of the soils derived from charnockite satisfy the requirements by the Nigerian General Specification for use as subgrade and subbase materials, while those derived from migmatite generally have poor geotechnical properties. The soils derived from charnockite are recommended for use as pavement layer materials, while those derived from migmatite need to be stabilized before being used.