Summary
Residual soils, most of which are lateritic serve as subgrade and even sub-base and base layers for road and highway pavements in the subregion. However, the material is known to undergo substantial strength reduction when they become saturated with water. An understanding of the dependence of the CBR strength of local soils on water content will contribute towards better design and maintenance practices. Samples of soil from a study site were prepared by laboratory compaction at the optimum water content using different levels of compaction to obtain samples at different densities. The remoulded samples were then subjected to different levels of wetting in a water tank and different degrees of drying in the laboratory and the CBR determined. The variation of the CBR with the water content is presented and discussed and related to the matric suction.
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References
Ampadu SIK (1997) The compaction characteristics of residual soils, In: Proc 3rd Int Conf on Structural Eng Analysis and Modeling, Accra, 7–11 September 1997
Ampadu SIK (2006) The loss of strength of an unsaturated local soil on soaking, Geotechnical Symposium, University of Rome, March 16-17, 2006 (in print)
ASTM D 1557-91 Standard Test Method for Laboratory Compaction Characteristics of Soil Using Modified Effort. Annual Book of ASTM Standards
ASTM D 1883-91 Standard Test Method for CBR of laboratory-compacted soils. Annual Book of ASTM Standards
ASTM D 5298-03 Standard Test Method for Measurement of Soil Potential (Suction) Using Filter Paper. Annual Book of ASTM Standards
BS 1377–1990 British Standard Methods of tests for Soils for civil engineering purposes, British Standards Institution
Charman JH (1995) Laterite in road pavements. CIRIA Special Publication 47. Transport Research Laboratory, Department of Transport
Croney D, Croney P (1998) Design and Performance of Road Pavements, 3rd Edn. McGraw Hill, pp 137–138
Hammond AA (1970) A study of some laterite gravels from the Kumasi district. Building and Road Research Institute, Project Report SM.5
Sanchez-Leal FJ (2002) Interpretation of CBR test results under the shear strength concept of unsaturated soil mechanics. In: Proc 3rd Int Conf on unsaturated soils (USAT 2002), Recife, pp 663–668
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© 2007 Springer-Verlag
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Ampadu, S.I.K. (2007). A Laboratory Investigation into the Effect of Water Content on the CBR of a Subgrade soil. In: Schanz, T. (eds) Experimental Unsaturated Soil Mechanics. Springer Proceedings in Physics, vol 112. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-69873-6_12
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DOI: https://doi.org/10.1007/3-540-69873-6_12
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-69872-2
Online ISBN: 978-3-540-69873-9
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