permeability testing Articles

  • A Note on Falling Headwater and Rising Tailwater Permeability Tests

    Falling-head permeability tests may be performed in two ways: (1) with a constant tailwater pressure and (2) with a rising tailwater pressure. Equations published in textbooks and manuals for calculating hydraulic conductivity from a falling-head test are for the first type of test only and are in error by a factor of 2 when applied to the second type of test. The correct equations for ...


    By ASTM International

  • Dynamic Air Permeability Testing - An Important New Tool

    ABSTRACT A new method and instrument is discussed for dynamic air permeability testing of airbag fabrics. This new method provides for much more representative test results as the commonly used static, low pressure air permeability test. The use and significance of the dynamic air permeability and air permeability curve exponent are explained for both, the airbag system designer and the airbag ...


    By Textest AG

  • Simple and effective permeability testing of thermoformed plastic containers

    Daiwa Can is one of Japan's leading packaging manufacturers, supplying beverage manufacturers with top quality containers and creative packaging solutions. Daiwa Can’s plastic container range are multi-layer packages manufactured using a ...


    By Systech Instruments Ltd

  • Rigorous Theoretical Analysis of a Flow Pump Permeability Test

    With the growing importance of environmental issues in our society, extremely low-permeability geotechnical materials are being studied increasingly for their long-term stability and effectiveness in retarding the transport of hazardous wastes. Relatively rapid measurements of the permeability and specific storage of the materials, using relatively low hydraulic gradients, can be obtained with a ...


    By ASTM International

  • Assessing the potential for restoration of surface permeability for permeable pavements through maintenance

    Permeable pavements (PPs) have been in use as stormwater management systems in Canada and the United States for over 20 years. After years of exposure to sediment and debris build-up, surface clogging reduces the infiltration of stormwater and inhibits the hydraulic and environmental functions of the pavement. Removal of surface material has been shown to restore infiltration but the majority of ...


    By IWA Publishing

  • Direct and Indirect Permeability of Fissured Tills

    Comparison of direct and indirect measurements of water permeability on relatively large undisturbed and compacted Scottish till specimens in rigid-wall (Rowe cells) and flexible-wall (triaxial cells) permeameters shows the interaction of macro-fabric, test method, evaluation basis, effective stress, and possibly sidewall leakage. At low stresses, the sidewall leakage in a Rowe cell is the most ...


    By ASTM International

  • Large-Scale Laboratory Permeability Testing of a Compacted Clay Soil

    Constant-head permeability (hydraulic conductivity) tests were performed on samples of a compacted clay soil using a 0.914 by 0.914 by 0.457-m (3 by 3 by 1.5-ft) large-scale, double-ring, rigid-wall permeameter. A naturally occurring silty clay soil was used for the permeability tests. The soil was separated into five different fractions representing five different ranges in precompaction clod ...


    By ASTM International

  • Equivalence of Air and Water Permeability Tests in Evaluating Engineering Fabrics

    Permeability characteristics of civil engineering filter fabrics are currently evaluated by three types of tests: air permeability and falling-head and constant-head water permeability. Test procedures for the falling-head and constant-head water permeability tests are discussed, and results from these tests are correlated to air permeability results for filter fabrics. Several commercially ...


    By ASTM International

  • Evaluation of Performance of Permeable Interlocking Block Pavements

    Drainable or permeable pavement systems are rapidly gaining popularity in Japan because of the high level of precipitation and the growing need for measures against the deteriorating road environment. In the field of interlocking block pavements, highly-porous permeable systems are expected to be increasingly used for constructing walkways and other facilities. However, various issues remain to ...

  • Field Demonstration of a Permeable Bioreactive Barrier for Leachate Control.

    ABSTRACT: A biostimulation technique was selected for a pilot study to treat groundwater at a former New Jersey municipal landfill. The process will address a mixture of chlorinated compounds (e.g. vinyl chloride and chlorobenzene), hydrocarbons (e.g. benzene and methyl ethyl ketone) and heavy metals. The reactive barrier will be constructed using a series of injection points to implace a slurry ...


    By REGENESIS

  • Electrokinetic delivery of permanganate into low-permeability soils

    A bench-scale study was conducted to investigate the feasibility of using electrokinetics as a method of delivering an oxidant into kaolin, a low-permeability soil. Potassium permanganate (KMnO4) was chosen as the oxidant, and in separate tests, KMnO4 was introduced at the anode, the cathode and both electrodes to investigate (1) the extent of oxidant transport via ...


    By Inderscience Publishers

  • Soil Air Permeability: Threshold Gradient and Anisotropy

    In this study, a triaxial confinement chamber and mass flow meter were used to measure the air permeability of compacted clayey sand specimens. Specimens were extracted at different angles with respect to the vertical direction to measure the anisotropy. The soil was compacted at high water contents below the optimum.At lower gradients, deviations from Darcy´s law were observed. Threshold ...


    By ASTM International

  • The effect of permeable pavement on water quality and quantity

    ABSTRACT Three studies have been conducted by NC State University faculty since 1999 regarding permeable pavement. A test of long term hydrologic conductivity was conducted on three lots in Eastern NC. The initial hydrologic infiltration rate study showed a significant reduction in surface runoff. The Curve Numbers at the Kinston, Wilmington, and Swansboro sites were 79, 89, and 45 ...

  • Measurements of Coupled Normal Deformation, Permeability, and Heat Transfer in Rock Joints Using a Triaxial Test Facility

    A description is presented of a rock-mechanics triaxial test facility capable of coupled testing of medium-sized cylindrical rock specimens at axial loads to 2.67 MN, confining pressures to 140 MPa, pore pressures to 105 MPa, and specimen temperature to 400°C. The test cell of the system is modified to carry out tests on fluid mass and heat transfer through rock joints/fractures and ...


    By ASTM International

  • Proposed Standard Test Method for Measurement of Pneumatic Permeability of Partially Saturated Porous Materials by Flowing Air

    This proposed standard describes a laboratory test method for the measurement of the coefficient of permeability for airflow (pneumatic permeability) through porous media (e.g., soils) partially saturated with water. Control and measurement of the airflow is effected at the inlet of the specimen. The permeameter cell is fitted with dual transfer lines that isolate the specimen pressure drop from ...


    By ASTM International

  • Graphical Method for Determining the Coefficient of Consolidation cv from a Flow-Pump Permeability Test

    A graphical method has been developed for determining the coefficient of consolidation from the transient phases of a flow-pump permeability test. The flow pump can be used to infuse fluid into or withdraw fluid from a laboratory sediment specimen at a constant volumetric rate in order to obtain data that can be used to calculate permeability using Darcy´s law. When the initial transient-response ...


    By ASTM International

  • Triaxial permeability testing and microstructure study of hard–to–drain coal from Sydney Basin, Australia

    Several mines operating in the Bulli seam of the Sydney Basin, Australia have coal seam zones that are difficult to drain. Metropolitan Colliery being one of such mines, has experienced difficulties in reducing gas content within the available drainage lead time; as the coal seam would not drain even with additional drainage boreholes. A research study using coal permeability testing and ...


    By Inderscience Publishers

  • Use of Permeability as an Index to Characterize Internal Structural Changes and Fracture Mechanism

    This study investigated the possibility of using variation in the permeability as an index to characterize internal structural changes and fracture mechanism of a soft rock under triaxial loadings. Extensive triaxial tests were carried out on soft rock specimens to examine this idea. These tests include (1) triaxial compression tests with low and high confining pressures, (2) triaxial tests with ...


    By ASTM International

  • Long core physical simulation for CO 2 flooding in low permeability reservoir

    CO 2 flooding is a proven great method to be used for enhancing injection capacity and increasing oil production in low permeability reservoir. In this paper, based on the natural cores and crude oil of Jilin oilfield, three sets of long core tests were conducted to study oil recovery, GOR and pressure variations during water flooding and CO 2 flooding. The performance of advanced CO ...


    By Inderscience Publishers

  • On permeable porosity in bio-inspired fibre reinforced cementitious composites

    Permeability plays an important role in governing the durability of concrete in deleterious environments. Previous permeability tests using water as the permeating medium have indicated that the addition of cellulose fibre is effective in reducing water permeability both in the presence and absence of stress and thereby making concrete more durable. In this paper, further evidence was sought of ...


    By Inderscience Publishers

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