SERVICEABILITY LOSS DUE TO ROUGHNESS CAUSED BY VOLUME CHANGE IN EXPANSIVE CLAY SUBGRADES.
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It is common knowledge that pavements built on expansive clay subgrades will become rough whether heavily trafficked or not. Therefore it is obvious that much of the roughness that occurs on such roadways is caused by differential volume change in the subgrade, but this has been largely ignored in both analysis and design. Relatively little research effort has been expended to study this source of serviceability loss. Velasco and Lytton recently developed a multiple regression model to predict loss of serviceability with time caused by differential volume change in expansive clay subgrades.