Topic
Permeability (earth sciences)
About: Permeability (earth sciences) is a research topic. Over the lifetime, 15424 publications have been published within this topic receiving 288535 citations.
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TL;DR: In this paper, the impact of closed-system freeze-thaw cycles on the permeability of clay, till, and sand-bentonite mixtures was examined in a laboratory test program.
Abstract: The impact of closed-system freeze–thaw cycles on the permeability of clay, till, and sand–bentonite mixtures was examined in a laboratory test program. The bentonite content of the sand–bentonite mixtures varied from 4.5 to 25%. Test samples were prepared by dry mixing, moisture conditioning, and compacting materials according to ASTM D698, method A specifications. The molding water content of these samples was at or slightly wet of optimum. Trimmed test samples were placed in a triaxial permeameter and their unfrozen or initial permeability was established. These permeability tests were conducted for approximately 10 000 min using low hydraulic gradients and confining stress. Changes in specimen volume were also measured during permeability testing. Once the initial permeability of a specimen was established, the test was halted and the specimen was frozen inside the permeameter with no access to water. After freezing, the specimens were allowed to thaw before a second permeability test was conducted. T...
90 citations
90 citations
TL;DR: In this paper, a concrete specimen is subjected to uniaxial tension, and the water permeability is measured in a direction perpendicular to the axis of loading in order to estimate the increase in permeability resulting from mechanically-induced cracking.
Abstract: Cracking of concrete, whatever its origin (mechanical, physico-chemical, thermal,…) is a key factor for the materials durability. Knowledge of the transfer properties of sound and of cracked concrete is essential for predicting its durability since the deteriorating mechanisms (freezing, corrosion, leaching) depend on the flow of aggressive (liquid or gaseous) agents through the porous or cracked body. A series of experiments is intended to estimate the increase in permeability resulting from mechanically-induced cracking. A concrete specimen is subjected to uniaxial tension, and the water permeability is measured in a direction perpendicular to the axis of loading. The tests are designed and monitored in order to collect useful data for modelling concrete structures: the material is in tension (and not in compression as it is in more classical studies of damage-permeability coupling) and the permeability is measured through open cracks covering a large width range (0.1 μm–0.1mm). Thus, the transfer properties are being evaluated in the most unfavorable context. Herein we detail the principle of the tests and the design of the specimen, using numerical simulations, as well as present and comment the first experimental results.
90 citations
TL;DR: In this article, the authors reviewed the permeability of natural gas hydrate-bearing sediments with respect to its relevant factors and development in characterization, and highlighted multi-scale analysis on the hydrate permeability with appropriate parameters as well as developing models for safe and economically feasible gas production from HBS eventually.
90 citations
TL;DR: In this article, the authors present experiments conducted in sand-packed columns with initially steady unsaturated flow conditions that show significant biomass-induced changes in pressure heads and water contents and permeability reduction during growth of a Pseudomonas fluorescens bacterium, and discuss characteristics of unsaturated or variably saturated porous media that may be important to consider when modeling such phenomena in these systems.
90 citations