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Characterization of the Swelling Clay Parameter Used in the Pavement Design System
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1970-08-01
[PDF-2.02 MB]
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Abstract:The purpose of this study was to quantify the swelling clay parameter used in the systems approach to pavement design. The quantification of the parameter was to be made using data from standard laboratory soils tests and actual concrete pavements. The pavement sections used in the research were chosen so that only the soil properties of the subgrade varied. To insure that the subgrade soils were different, statistical tests were performed. The quantification of the parameter involved three steps. First, the Present Serviceability Indexes were computed from the average slope variances of the pavement sections at various times. With the PSI versus time data, the swelling clay parameter was characterized using the Serviceability Loss Function. Using the calculated values for the swelling clay parameter and various soil properties, the parameter was quantified. The quantification was made using both single and multiple regression analyses. A design equation for use in the Pavement Design System is presented. It expresses the swelling clay parameter in terms of the plastic, liquid, shrinkage, and linear shrinkage limits.
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