Hydraulic conductivity of clays in confined tests under low hydraulic gradientsHydraulic conductivity of clays in confined tests under low hydraulic gradients Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2015-10-202012enSand and kaolin compacted mixtures were tested in the laboratory to investigate the effect of applied hydraulic gradient on the hydraulic conductivity measurement. Kaolin clay was added to the samples at a percentage 15, 30, 50, 70, 85 and 100% by dry weight, and hydraulic conductivity tests were performed on specimens prepared at 2% above optimum moisture content. The tests were conducted under different hydraulic gradients, using a rigid wall pressure permeameter. A definite pattern of non-Darcy behavior was recognizable in the poorly graded samples with low plasticity and fines content less than 30%. For samples with greater amount of fines and medium plasticity, Darcy behavior was observed, without a noticeable change in the flow behavior.http://creativecommons.org/licenses/by/4.0/Geotechnical Engineering17783-799 Steiakakis Manolis Στειακακης Μανωλης Gamvroudis Christos Γαμβρουδης Χρηστος Komodromos, Andreas Repouskou Eftychia Ρεπουσκου Ευτυχια Hydraulic structures--Construction hydraulic structures design and construction hydraulic structures construction