United States Department of Transportation
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Evaluation of Pavement Base and Subgrade Material Properties and Test Procedures
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1995-11-01
[PDF-3.58 MB]
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Edition:Interim: March 1994 - August 1995
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Abstract:The objective of this research was to develop simpler and less expensive procedures for characterizing the resilient properties, K1 to K3; the strength parameters, cohesion, C; and angle of internal friction of base and subgrade materials. Researchers accomplished this by developing prediction equations which use easy to obtain soil properties and by evaluating a modified Texas triaxial test procedure which can be used to determine both the strength and resilient properties of pavement materials. Researchers tested five subgrade soils, i.e., sand, lean clay, fat clay, silt, and sandy gravel, and four base materials, i.e., crushed limestone, caliche, shell base, and iron ore gravel, according to Texas specifications to obtain a database of material properties for developing the prediction equations. In developing this database, the strength parameters, C and 0 of the Mohr Coulomb yield criterion, were obtained from standard Texas triaxial tests. For the resilient properties, compressive creep and recovery tests were run using AASHTO T-274 as a guide, to obtain the resilient moduli and Poisson's ratios of the materials tested at different stress states and moisture contents.
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