permeability testing Articles
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An Alternate Method for Determining the Klinkenberg Correction
Gas slip phenomena in low-permeability media are typically accounted for by means of the conventional Klinkenberg correction. This correction is derived from gas permeability tests conducted under different pore pressures. An alternative method for obtaining the Klinkenberg correction is given which uses the results from gas permeability tests conducted with different gases under the same pore ...
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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 ...
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Evaluation of Performance of Permeable Interlocking Block Pavements - Case Study
Abstract 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 ...
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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 ...
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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 deep-draw vacuum thermoforming process. This method involves creating a centre barrier layer, which improves the oxygen barrier performance of the ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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Geotechnical Properties of Hackensack Valley Varved Clays of New Jersey
A special testing program was conduted on 127-mm (5-in.) diameter samples of varved clay from Hackensack Meadows, the site of a glacial lake near Secaucus, New Jersey. The program included constant rate-of-strain consolidation tests, measurement of K0 versus OCR, permeability tests on cubic samples to determine kh/kv, undrained-unconsolidated triaxial compression tests run on specimens cut at ...
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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 ...
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Differential Flow Patterns Through Compacted Clays
The determination of the hydraulic conductivity of compacted clays is vital when the clay is to be used as a liner for contaminant of hazardous waste. Therefore different types of permeameters were used and modified to investigate the homogeneity of a compacted specimens.Flexible wall and fixed wall permeameters were modified using multiple ring bases to determine the magnitude of differential ...
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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 ...
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Joint estimation of hydraulic conductivities of two sand samples in a W-tube system with a bi-exponential response
The motivation for this paper is the practical problem of interpreting bi-exponential rate-of-rise curves that are observed during many field piezometric tests. In the authors' previous study, a laboratory W-tube system of water flow through two samples of sand was introduced with an adequate mathematical model. The desired bi-exponential character of water flow was obtained by placing two ...
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Case study - High reactivity Metakaolin utilized in high performance Virginia bridge
The Virginia Department of Transportation and Marshall Concrete Products have included Headwaters Resources’ HRM modified concrete as one of the high performance concrete mixes for the Virginia DOT “Smart Road” research project. Unlike most research that investigates one item on a limited scale in a laboratory, the Smart Road is a $35 million combined construction and research ...
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The Measurement and Prediction of Conditions within Indoor Microenvironments
Biocontaminants, such as dust mites and microfungi, can live in building habitats with a spatial scale of only a few millimetres. With the recent development of very small size microchip-based sensors, it is now practicable to measure the humidity at different locations within these microenvironments. In the laboratory study described here, sensors were used to measure the conditions in a number ...
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Effect of Preparation Technique on Permeability and Strength of Cement-Grouted Sand
The effectiveness of cement grouting is generally evaluated in terms of the improvement attained in the engineering properties of the grouted soil. Although this degree of improvement should logically be related to the amount of cementitious particles present in the pore spaces of the grouted sand, and indeed is to some extent, the method of preparing the specimens can exert an even stronger ...
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Water quality and quantity assessment of pervious pavements performance in experimental car park areas
Pervious pavements have become one of the most used sustainable urban drainage system (SUDS) techniques in car parks. This research paper presents the results of monitoring water quality from several experimental car park areas designed and constructed in Spain with bays made of interlocking concrete block pavement, porous asphalt, polymer-modified porous concrete and reinforced grass with ...
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Phosphorus removal using nanofiltration membranes
A high concentration of phosphorus in wastewater may lead to excessive algae growth and de-oxygenation of the water. In this work, nanofiltration (NF) of phosphorus-rich solutions is studied in order to investigate its potential in removing and recycling phosphorus. Wastewater samples from a pulp and paper plant were first analyzed. Commercial membranes (DK5, MPF34, NF90, NF270, NF200) were ...
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