This study describes the development of a laboratory large-scale pavement testing apparatus to evaluate the behavior of geogrid reinforced pavement foundations through wheel tests performed with problematic subgrade soils found in North Georgia. The large-scale apparatus is equipped to measure permanent wheel rutting, pressure variation along the depth of the pavement foundation, and strain of the geogrid. Further, a Finite Element Model (FEM) of the experimentally tested pavement foundations was created to analytically examine the pressure distribution due to load effects as well as further examine the reduction in thickness of the pavement foundation. Ultimately, this study concludes that geogrid reduces vertical pressures and permanent wheel rutting in pavement foundations when placed at the UAB-subgrade interface or mid-height of the UAB layer and that the reduction in thickness of the aggregate base layer is quantifiable with supporting evidence for the use of geogrid when designing pavement foundations over problematic soils.