Abdi, M.R., Sadrnejad, A., Arjomand, M.A., 2009. Strength enhancement of clay by encapsulating geogrids in thin layers of sand. Geotextiles and Geomembranes 27,
447–455.
Abusharar, S.W., Han, J., 2011. Two-dimensional deep-seated slope stability analysis of embankments over stone column-improved soft clay. Engineering Geology 120,
103–110.
Al-Qadi, I.L., Lahouar, S., 2004. Use of GPR for thickness measurement and quality control of flexible pavements. Journal of the Association of Asphalt Paving Technologists
73, 501–528.
Al-Qadi, I.L., Lahouar, S., Loulizi, A., Elseifi, M.A., Wilkes, J.A., 2004. Effective approach to improve pavement drainage layers. Journal of Transportation Engineering 130 (5),
658–664.
American Association of State Highway and Transportation Officials (AASHTO), 2011. Roadside Design Guide, fourth ed. Washington, DC.
American Society for Testing and Materials, 2007. Ground Penetrating Radar, 2nd Edition. ASTM D698-07e1 Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort, USA.
Ayala-Cabrera, D., Herrera, M., Izquierdo, J., Pérez-García, R., 2011. Location of buried plastic pipes using multi-agent support based on GPR images. Journal of Applied Geophysics 75, 679–686.
Benedetto, A., 2004. Theoretical approach to electromagnetic monitoring of road pavement. Proceedings of 10th International Conference on Ground Penetrating Radar. Delft, The Netherlands.
Benedetto, A., 2010. Water content evaluation in unsaturated soil using GPR signal analysis in the frequency domain. Journal of Applied Geophysics 71, 26–35.
Benedetto, A., Pensa, S., 2007. Indirect diagnosis of pavement structural damages using surface GPR reflection techniques. Journal of Applied Geophysics 62, 107–123.
Benedetto, F., Tosti, F., 2013. GPR spectral analysis for clay content evaluation by the frequency shift method. Journal of Applied Geophysics 97, 89–96 (in this issue).
Benedetto, A., Tosti, F.,Di Domenico, L., 2012a. Ellipticmodel for prediction of deflections induced by a Light FallingWeight Deflectometer. Journal of Terramechanics 49 (1), 1–12.
Benedetto, A., Benedetto, F., Tosti, F., 2012b. GPR applications for geotechnical stability of transportation infrastructures. Nondestructive Testing and Evaluation 27 (3), 253–262.
Benedetto, A., Manacorda, G., Simi, A., Tosti, F., 2012c. Novel perspectives in bridges inspection using GPR. Nondestructive Testing and Evaluation 27 (3), 239–251.
Beroya, M.A.A., Aydin, A., Katzenbach, R., 2009. Insight into the effects of clay mineralogy on the cyclic behavior of silt–clay mixtures. Engineering Geology 106, 154–162.
Chertkov, V.Y., 2005. The shrinkage geometry factor of a soil layer. Soil Science Society of America Journal 69, 1631–1683.
Chertkov, V.Y., Ravina, I., 2000. Shrinking–swelling phenomenon of clay soils attributed to capillary-crack network. Theoretical and Applied Fracture Mechanics 34, 61–71.
Daniels, D.J., 2004. Ground Penetrating Radar, 2nd Edition. The Inst. Electrical Eng, London, UK.
Davis, J.L., Annan, A.P., 1989. Ground-penetrating radar for high resolution mapping of soil and rock stratigraphy. Geophysical Prospecting 37, 531–551.
Diefenderfer, B.K., Galal, K., Mokarem, D.W., 2005. Effect of subsurface drainage on the structural capacity of flexible pavement. VTRC 05-R35. Project 66818. 29.
Dudoignon, P., Causseque, S., Bernard, M., Hallaire, V., Pons, Y., 2007. Vertical porosity profile of a clay-rich marsh soil. Catena 70, 480–492.
Fiori, A., Benedetto, A., Romanelli, M., 2005. Application of the effective medium approximation for determining water contents through GPR in coarse-grained soil materials. Geophysical Research Letters 32, L09404. http://dx.doi.org/10.1029/2005GL022555.
George, K.P., 2000. Subgrade characterization for highway pavement design. Final Report MS-DOT-RD-00-131. University of Mississippi, Mississippi, MS.
Hallaire, V., 1987. Retrait vertical d'un sol argileux au cours du dessèchement. Mesures de l'affaissement et conséquence structurales. Agronomie 7 (8), 631–637.
Huisman, J.A., Hubbard, S.S., Redman, J.D., Annan, A.P., 2003. Measuring soil water content with ground penetrating radar: a review. Vadose Zone Journal 2, 476–491.
Huston, D.R., Hu, J., Maser, K.,Weedon,W., Adam, C., 1999. Ground penetrating radar for concrete bridge health monitoring applications. Proceedings of SPIE 1355, 170–179.
Huyer, W., Neumaier, A., 1999. Global optimization by multilevel coordinate search. Journal of Global Optimization 14, 331–355.
Lambot, S., Javaux, M., Hupet, F., Vanclooster, M., 2002. A global multilevel coordinate search procedure for estimating the unsaturated soil hydraulic properties. Water Resources Research 38 (11), 1224. http://dx.doi.org/10.1029/2001WR001224.
Lambot, S., Slob, E.C., van den Bosch, I., Stockbroeckx, B., Vanclooster, M., 2004. Modeling of ground-penetrating radar for accurate characterization of subsurface electric properties. IEEE Transactions on Geoscience and Remote 42, 2555–2568.
Lambot, S., van den Bosch, I., Stockbroeckx, B., Druyts, P., Vanclooster, M., Slob, E.C., 2005. Frequency dependence of the soil electromagnetic properties derived from
ground-penetrating radar signal inversion. Subsurface Sensing Technologies and Applications 6, 73–87.
Lambot, S., Weihermüller, L., Huisman, J.A., Vereecken, H., Vanclooster, M., Slob, E.C., 2006. Analysis of air-launched ground-penetrating radar techniques to measure
the soil surface water content. Water Resources Research 42, W11403. http://dx.doi.org/10.1029/2006WR005097.
Lambot, S., Slob, E.C., Vereecken, H., 2007. Fast evaluation of zero-offset Green's function for layered media with application to ground-penetrating radar. Geophysical Research Letters 34, L21405. http://dx.doi.org/10.1029/2007GL031459.
Lau, C.L., Scullion, T., Chan, P., 1992. Modeling of ground-penetrating radar wave propagation in pavement systems. Transportation Research Record 1355, 99–107.
Mie, G., 1908. Beiträge zur Optik trüber Medien, speziell kolloidaler Metallösungen. Annalen der Physik 330, 377.
Miqueleiz, L., Ramirez, F., Seco, A., Nidzam, R.M., Kinuthia, J.M., Abu Tair, A., Garcia, R., 2012. The use of stabilised Spanish clay soil for sustainable construction materials. Engineering Geology 133–134, 9–15.
Odeh, I.O.A., McBratney, A.B., 2000. Using AVHRR images for spatial prediction of clay content in the lower Namoi Valley of eastern Australia. Geoderma 97, 237–254.
Oden, C.P., Olhoeft, G.R., Wright, D.L., Powers, M.H., 2008. Measuring the electrical properties of soil using a calibrated ground-coupled GPR system. Vadose Zone Journal 7 (1), 171–183.
Pakbaz, M.S., Alipour, R., 2012. Influence of cement addition on the geotechnical properties of an Iranian clay. Applied Clay Science 67–68, 1–4.
Patriarca, C., Lambot, S., Mahmoudzadeh, M.R., Minet, J., Slob, E.C., 2011. Reconstruction of sub-wavelength fractures and physical properties of masonry media using full waveform inversion of proximal penetrating radar. Journal of Applied Geophysics 74, 26–37.
Patriarca, C., Tosti, F., Velds, C., Benedetto, A., Slob, E., Lambot, S., 2013. Frequency dependent electric properties of homogeneous multi-phase lossy media in the ground-penetrating radar frequency range. Journal of Applied Geophysics 97, 81–88 (this issue).
Pettinelli, E., Vannaroni, G., Di Pasquo, B., Mattei, E., DiMatteo, A., De Santis, A., Annan, P.A., 2007. Correlation between near-surface electromagnetic soil parameters and early time GPR signals: an experimental study. Geophysics 72 (2), A25–A28.
Richard, G., Cousin, I., Sillon, J.F., Bruand, A., Guérif, J., 2001. Effect of compaction on the porosity of a silty soil: influence on unsaturated hydraulic properties. European Journal of Soil Science 52, 49–58.
Robinson, D.A., Phillips, C.P., 2001. Crust development in relation to vegetation and agricultural practice on erosion susceptible, dispersive clay soils from central and southern Italy. Soil and Tillage Research 60, 1–9.
Robinson, D.A., Jones, S.B., Wraith, J.M., Or, D., Friedman, S.P., 2003. A review of advances in dielectric and electrical conductivity measurement in soils using time domain reflectometry. Vadose Zone Journal 2, 444–475.
Rozynek, Z.,Mauroy, H., Castberg, R.C., Knudsen, K.D., Fossum, J.O., 2012. Dipolar ordering of clay particles in various carrier fluids. Revista Cubana de Física 29, 1E37.
Saarenketo, T., Scullion, T., 2000. Road evaluation with ground penetrating radar. Journal of Applied Geophysics 43 (2), 119–138.
Scullion, T., Lau, C.L., Chen, Y., 1994. Pavement evaluations using ground penetrating radar. Proceedings of the 5th International Conference on Ground Penetrating Radar, Kitchener, Ontario, Canada, pp. 449–463.
Sdiri, A., Higashia, T., Hattab, T., Jamoussic, F., Tasea, N., 2011. Evaluating the adsorptive capacity of montmorillonitic and calcareous clays on the removal of several heavy metals in aqueous systems. Chemical Engineering Journal 172, 37–46.
Slob, E., Sato, M., Olhoeft, G., 2010. Surface and borehole ground-penetrating-radar developments. Geophysics 75, A103–A120.
Tighe, S., Li, N., Falls, L.C., Haas, R., 2000. Incorporating road safety into pavement management. Transportation Research Record 1699, 1–10.
Topp, G.C., Davis, J.L., Annan, A.P., 1980. Electromagnetic determination of soil water content: measurements in coaxial transmission lines. Water Resources Research 16 (3), 574–582.
Tosti, F., Benedetto, A., 2012. Pavement Pumping Prediction using Ground Penetrating Radar. Proceedings of the 5th International Congress on Sustainability of Road Infrastructures, Rome, Italy, 53, pp. 1045–1054.
Tran, A.P., Ardekani, M.R.M., Lambot, S., 2012. Coupling of dielectric mixing models with full-wave ground-penetrating radar signal inversion for sandy-soil-moisture estimation. Geophysics 77, H33–H44.
Triantafilis, J., Lesch, S.M., 2005. Mapping clay content variation using electromagnetic induction techniques. Computers and Electronics in Agriculture 46, 203–237.
Van der Kruk, J., Slob, E.C., 2004. Reduction of reflections from above surface objects in GPR data. Journal of Applied Geophysics 55, 271–278.
Viscarra Rossel, R.A., Cattle, S.R., Ortega, A., Fouad, Y., 2009. In situ measurements of soil colour, mineral composition and clay content by vis–NIR spectroscopy. Geoderma 150, 253–266.
Voltz, M., Cabidoche, Y.M., 1995. Non-uniform volume and water content change in swelling clay soil: I. Theoretical analysis. European Journal of Soil Science 46, 333–343.
Wood, G.S., Osborne, J.R., Forde, M.C., 1995. Soil parameters for estimating the rolling resistance of earthmoving plant on a compacted silty cohesive soil. Journal of Terramechanics 32 (1), 27–41.
Wu, R., Li, J., Liu, Z.S., 1999. Super resolution time delay estimation via MODEWRELAX. IEEE Transactions on Aerospace and Electronic Systems 35 (1), 294–307.