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One of the important components of a flexible pavement structure is granular material layers. Unsaturated granular pavement materials (UGPMs) in these layers influence stresses and strains throughout the pavement structure, and have a large effect on asphalt concrete fatigue and pavement rutting (two of the primary failure mechanisms for flexible pavements.) The behavior of UGPMs is dependent on water content, but this effect has been traditionally difficult to quantify using either empiricaldoi:10.1061/(asce)1090-0241(2004)130:9(896) fatcat:vgbteatp7rbu7dtbfz56wed5im