This volume presents selected papers presented during the 4^th International Conference on Transportation Geotechnics. The papers address the geotechnical challenges in design, construction, maintenance, monitoring, and upgrading of roads, railways, airfields, and harbor facilities and other ground transportation infrastructure with the goal of providing safe, economic, environmental, reliable and sustainable infrastructures. This volume will be of interest to postgraduate students, academics, researchers, and consultants working in the field of civil and transport infrastructure.
About the Author: Erol Tutumluer is a Professor in the Department of Civil and Environmental Engineering and the Director of International Programs at the University of Illinois at Urbana-Champaign, USA, where he is also the Paul F. Kent Endowed Faculty Scholar. His research interests lie in testing and modeling of pavement and railroad track geo-materials, i.e., soils and base/ballast aggregates, size and shape characterization of aggregates using imaging and laser techniques, use of geosynthetics in transportation facilities, modeling of particulate media using discrete and finite element methods, neural network modeling, and mechanistic based pavement and railroad track design. Prof Tutumluer has authored and co-authored over 300 refereed papers
Soheil Nazarian is a Professor in the Department of Civil Engineering at the University of Texas at El Paso, USA. He has over 35 years of industry and academic experience in the area of transportation infrastructure, with an emphasis on structures materials, such as that of highways and bridges. His academic experience includes research and teaching positions at the Universities of Texas at Austin and El Paso, as well as the Director at the Center for Transportation Infrastructure Systems at UTEP. He holds a patent for the Moveable Seismic Pavement Analyzer, which is a nondestructive testing device used in evaluation of transportation infrastructure. Prof. Nazarian has been a contributor in over 100 research projects focused on nondestructive materials testing and materials applications, as well as the author of more than 300 industry related articles and publications.
Imad L. Al-Qadi is a Professor in the Department of Civil and Environmental Engineering and the Director of the Advanced Transportation Research and Engineering Laboratory (ATREL), the Illinois Center for Transportation (ICT), and the Smart Transportation Infrastructure Initiative (STII) at the University of Illinois at Urbana-Champaign, USA. He is also the President of the Transportation Engineering Solutions and Technologies, Inc. Al-Qadi's scholarly record features 700+ authored/co-authored publications, more than 400 of which are fully refereed papers (+280 in periodic journals). His research resulted in the development of new tests, testing specifications, advanced modeling and simulation of pavement loading, pavement layer interface and crack development, and analysis of radar electromagnetic wave interactions with civil engineering materials, roads, and bridges.

Dr. Issam I.A. Qamhia is currently a Postdoctoral research associate at the University of Illinois at Urbana-Champaign (UIUC). Dr. Qamhia holds a Ph.D. degree in civil engineering with transportation geotechnics specialization from UIUC, and M.S. and B.S. degrees in civil engineering from the University of Wisconsin Milwaukee and Birzeit University, respectively. He has over eight years of experience in aggregate characterization. His areas of expertise include repeated load testing, morphological shape characterization, tomography scanning, freeze-thaw testing, aggregate packing studies, as well as field characterization of bound and unbound aggregates through nondestructive and accelerated full-scale pavement testing. Dr. Qamhia has authored/co-authored more than 45 peer reviewed publications in prestigious international journals and conferences of repute, and is a frequent reviewer of journals and international conferences.