Studies on Subgrade and Subbase Course of the Farm Road in Dune Sand

Abstract

The elastic properties of the subgrade and the subbase course of a farm road are investigated experimentally in this paper. A kind of plate loading test was performed on dune sand subgrade and on subbase course over it. An attempt was made to evaluate the moduli of the deformation for each layer, which are needed for analytical design of pavement. The materials used for the subbase course were either unscreened stone fragments or the cement stabilized dune sand or both. The effects of plate size and load intensity on the modui of deformation of the dune sand subgrade were investigated. The bending strength of the cement stabilized subbase course was also evaluated.