The main focus of his research is improving the sustainability of today`s infrastructure. His research program places a strong emphasis on the sustainable development of geotechnical and transportation infrastructure including unpaved roads. Current research activities are mainly focused on the following fields: (1) Improvement of the sustainability of geotechnical structures; (2) environmental suitability of geotechnical structures built with waste materials and industrial byproducts; (3) performance of unpaved roads under freeze-thaw cycles.