Journal ArticleDOI
Effects of exchangeable cations on hydraulic conductivity of a marine clay
S. Narasimha Rao,Paul K. Mathew +1 more
TLDR
A laboratory study of the hydraulic conductivity of a marine clay with monovalent, divalent and trivalent cations revealed large differences in HC, which was related to the dispersion and deflocculation of clay.Abstract:
A laboratory study of the hydraulic conductivity (HC) of a marine clay with monovalent, divalent and trivalent cations revealed large differences in HC. The exchangeable cations employed in this study are Na, K, NH4, Mg, Ca and Al in order of increasing valency. An interpretation of the results derived from consolidation tests suggests that HC is significantly affected by the valency and size of the adsorbed cations. An increase in the valency of the adsorbed cations leads to quicker rates of consolidation and higher HC, while, for a constant valency an increase in the hydrated radius of the adsorbed cations results in a lower rate of consolidation and HC. The reduction in HC was related to the dispersion and deflocculation of clay. Lower valency and higher hydrated radii of the exchangeable cations enable the double layer repulsive forces to predominate, thereby increase dispersion and defloccalation.read more
Citations
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Hydraulic conductivity of bentonite-sand mixtures
TL;DR: The use of bentonite alone or amended with natural soils for construction of liners for water-retention and waste-containment facilities is very common as mentioned in this paper, and the importance of the bentonite content in reduc...
Journal ArticleDOI
Compressibility and hydraulic conductivity of a chemically treated expansive clay
TL;DR: In this paper, the effect of lime and fly ash on the compressibility and hydraulic characteristics of an expansive soil in Cyprus was evaluated. But the results were limited to a series of laboratory tests.
Journal ArticleDOI
The hydraulic conductivity of sediments: A pore size perspective
Xingwei Ren,J. C. Santamarina +1 more
TL;DR: In this article, the authors present an analysis of previously published hydraulic conductivity data for a wide range of sediments and highlight the robustness of the physics inspired data scrutiny based Hagen-Poiseuille and Kozeny-Carman analyses.
Journal ArticleDOI
Assessing the potential of biochar and charcoal to improve soil hydraulic properties in the humid Ethiopian Highlands: The Anjeni watershed
Haimanote K. Bayabil,Cathelijne R. Stoof,Cathelijne R. Stoof,Johannes Lehmann,Birru Yitaferu,Tammo S. Steenhuis,Tammo S. Steenhuis +6 more
TL;DR: In this article, the authors investigate whether some of the charcoal made in developing countries can also be beneficial for improving soil hydraulic properties, and explore whether charcoal could potentially restore the degraded African soils.
Journal ArticleDOI
Viscous Behaviour of Soft Clay and Inducing Factors
TL;DR: In this paper, the authors classified the causes of soil creep into five main groups, namely (a) breakdown of the interparticle bonds, (b) sliding between the soil particles, (c) water flow from micropores to macro-pores, (d) the deformation due to the structural viscosity and (e) the jumping of bonds.
References
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Journal ArticleDOI
Individual Activity Coefficients of Ions in Aqueous Solutions
TL;DR: A revised and extended table of ionic activity coefficients, which has largely been computed by independent means, taking into consideration the diameter of the hydrated ions,* as estimated by various methods, is presented in this article.