Parameters affecting the measurement of hydraulic conductivity for solidified stabilized wastes



Publisher: U.S. Environmental Protection Agency, Risk Reduction Engineering Laboratory, Publisher: National Technical Information Service, distributor in Cincinnati, OH, [Springfield, VA

Written in English
Published: Downloads: 304
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Subjects:

  • Groundwater -- United States -- Measurement,
  • Hydraulic engineering -- United States,
  • Soil percolation -- United States

Edition Notes

Other titlesProject summary
StatementD.J. Conrad ... [et al.]
ContributionsConrad, D. J, Risk Reduction Engineering Laboratory (U.S.)
The Physical Object
FormatMicroform
Pagination5 p.
ID Numbers
Open LibraryOL15233445M

Flow cells are also used to measure unsaturated hydraulic conductivity (K(Ψ)), but unlike with saturated hydraulic conductivity, the measurement requires tensiometers (Figure 10). Figure Flow cell and tensiometer cross section. Water flows from a . C. Nonlinear Inversion. With the reformulated poroelastic model serving as the governing equations, an overlapping subzone, iterative parameter estimation algorithm analogous to the methods we have used in the past [], [] was implemented to recover spatial maps (images) of shear modulus and hydraulic inversion minimizes the difference between the computed (by the reformulated. Fractures affect leaching operations in several ways. Fractures are important for developing and maintaining adequate capacity for the injection and recovery of leach solutions. New fractures may be induced by hydraulic fracturing to improve hydraulic conductivity. was randomly chosen for unsaturated hydraulic conductivity and soil water retention measurements between 10 cm of H 2O using Tempe cells and pressure plate apparatuses. Measurements were made in eight to 10 tension steps for five Figure 1. Soil-slope map of the experimental field with two orthogonal sampling transects (NE-SW and NW.

A multiport permeameter was developed for use in estimating hydraulic conductivity over intact sections of aquifer core using the core liner as the permeameter body. Six cores obtained from one borehole through the upper 9 m of a stratified glacial-outwash aquifer were used to evaluate the reliability of the permeameter. Radiographs of the cores were used to assess core integrity and to locate. The ability of hydrologists to perform field measurements of aquifer hydraulic properties must be enhanced in order to significantly improve the capacity to solve groundwater contamination problems at Superfund and other sites. he primary purpose of this manual is to provide new methodologies for measuring K(z), the distribution of horizontal hydraulic conductivity in the vertical direction in. The influence of additives on cementation processes was studied. It was shown, that the increasing of water ratio from up to decreases water-cement mortar's viscosity more than 10 times. Mechanical stability of samples decreases 2 times, which reduces the bulk stability of cemented radioactive wastes package. The grain size and porosity are two parameters affecting the estimated hydraulic conductivity (see Eq. 1 in Method section). The original values of the two parameters were varied within a range from −20% to 20%. There are 8 runs for each parameter. Each run .

  Geosynthetic clay liners (GCLs) are factory-manufactured hydraulic barriers consisting of a thin layer of sodium bentonite (Na-B) clay (approximately 3 – 5 kg / m 2) sandwiched between two geotextiles that are bonded by needle punching or stitching (Shackelford et al. ).Some GCLs also include a geomembrane bonded to the bentonite, or laminated to the geotextile. horizontal to vertical hydraulic conductivity) ranged from to The vertical hydraulic conductivity of the riverbed was estimated to be to foot per day, where­ as permeameter tests on samples of silty sand and gravel lay­ ers from the riverbed yielded vertical hydraulic conductivity of . The results showed that the SHMP amendment causes a one order of magnitude decrease in hydraulic conductivity of the backfill using tap water ( to × 10 −10 m/s). Testing using mg/L Pb solution resulted insignificant variation in hydraulic conductivity of the amended backfill. Understanding the hydraulic conductivity of a geomaterial, noted asK [m/s], is crucial for various aspects of hydrogeology and geotechnical engineering, such as for modeling the groundwater flow. It is recognized that the hydraulic conductivity of a sediment sample is related to its pore structure, which is difficult to measure.

Parameters affecting the measurement of hydraulic conductivity for solidified stabilized wastes Download PDF EPUB FB2

This report deals with the effects of parameters affecting the measurement of hydraulic conductivity of solidified/stabilized waste. The study was undertaken to form bases for the development of a regulatory test method - to improve intra and inter-laboratory precision - and to correlate accelerated laboratory test results to those occurring under field conditions.

The complete report, entitled "Parameters Affecting the Measurement of Hydraulic Conductivity for Solidified/Stabilized Wastes," (Order No.

PB /AS; Cost: $, subject to change) will be available only from: National Technical Information Service Port Royal Road Springfield, VA Telephone: The EPA Project Officer can be contacted at: Risk Reduction Engineering Laboratory U.S. Environmental Protection Agency.

Get this from a library. Parameters affecting the measurement of hydraulic conductivity for solidified stabilized wastes. [D J Conrad; Risk Reduction Engineering Laboratory (U.S.);]. The equation proposed by Brooks and Corey () to estimate the unsaturated hydraulic conductivity of a soil is as follows: (5) k = k s a t (ψ b ψ) 2 + (5 λ / 2) for ψ ≥ ψ b (6) k = k s a t for ψ hydraulic conductivity of the water phase, k sat the saturated hydraulic conductivity of the water phase, ψ the soil suction (kPa), ψ b the Brooks and Corey () soil–water characteristic curve fitting parameter Cited by:   Deng YF, Yue X, Liu S, Chen Y, Zhang D () Hydraulic conductivity of cement-stabilized marine clay with metakaolin and its correlation with pore size distribution.

Eng Geol – Article Google ScholarCited by: 3. Electrical resistivity measurements can be used as a nondestructive method to evaluate the hydration development of solidified/stabilized leadcontaminated soils.

View full-text Article. Susan B. Bressler, Neil M. Bressler, in Retina (Fifth Edition), Changes in hydraulic conductivity. Hydraulic conductivity is the measurement of the bulk flow of fluid through a test membrane in response to applied pressure. Bruch's membrane would be expected to show increasing resistance to flow with age because it exhibits a linear increase in thickness 50 and a significant accumulation.

Darcy's law provides the basis for all methods used to determine hydraulic conductivity in this report. The range of validity of Darcy's law is discussed in Section (Lohman, ). Leachate conductivity: The fluid conductivity when leachate is the fluid.

Aquifer: A geologic formation, group of formations, or part. Critical parameters in the self-weight consolidation of tailings are the saturated hydraulic conductivity of the tailings sediment (which diminishes rapidly as consolidation progresses) and the drainage path length, dependent on the thickness of the tailings deposit, the rate of deposition, and the drainage conditions at the top and bottom boundaries.

This can occur when an intact stabilized/solidified waste form is disposed of in a medium with a hydraulic conductivity times greater (i.e., 10"6 to 10'4cm/s). In such cases, most of the contact between the leach- ing solution and the waste form occurs at the geo- metrical surface of the waste form.

After blending with a natural soil, the hydraulic conductivity of the binder-amended DSC was higher than that of clayey soil (1 × 10⁻⁵ cm/s to 1 × 10⁻⁶ cm/s).

Hydraulic conductivity values of approximately 10 −9 m/s are considered sufficient for recycling of the stabilized contaminated soil, for instance, as a subbase course in road pavement (Lin et al.

There seem to be conflicting findings regarding hydraulic conductivity changes over time. Hydraulic conductivity measurements after a period of post-exposure healing showed damaged specimens have some potential in recovering parts of the increased hydraulic conductivity value due to. affect hydraulic conductivity, such as facies changes in sedimentary rock, weldin g and alteration in volca - nic rocks, and degree of fracturing can cause hydrau - lic properties to vary greatly, even over relatively short distances.

Significant spatial bias may exist in the hydraulic-conductivity measurements. Wells tested for aquifer. Song-Yu Liu's 46 research works with citations and 7, reads, including: A shear model for solidified soils considering conservation of energy. Hydraulic conductivity is a measure of the ability of porous media to conduct liquid.

Although testing of hydraulic conductivity is simple in theory, movement of water through a medium is very complex. Many factors affect the hydraulic conductivity of soils, such as panicle size, void ratio, composition, fabric, degree of saturation (Lambe.

1 Factors affecting measurement of hydraulic conductivity in low strength cementitious materials Eshmaiel Ganjiana, *, Peter Claisse a, Mark Tyrer b and Alan Atkinsonb aSchool of Science and Environment, University of Coventry, Sir John Laing Building, Priory St., Coventry CV1 5FB, UK bDepartment of Materials, Royal school of Mines, Imperial college, Prince Consort Road, London.

Measurement of s/s product workability, bleeding and setting time of flowable mixtures, or Proctor compaction of compactable mixtures, together with UCS at 7, 14 and 28 d (with UCS after immersion at 28 d), and pH and TDS of a batch distilled water leaching test and hydraulic conductivity at 28 d, are recommended.

Determination of acute Hg emissions from solidified/stabilized cement waste forms. Waste Management17 (1), DOI: /SX(97) L.C. Lange, C.D. Hills, A.B. Poole. The influence of mix parameters and binder choice on the carbonation of cement solidified wastes.

Publication CSESP Produced by ommunications and arketing, ollege of Agriculture and Life Sciences, irginia Tech, Virginia ooperative xtension programs and employment are open to all, regardless of age, color, disability, gender, gender identity, gender expression, national origin, political affiliation, race, religion, sexual orientation, genetic.

Based on laboratory studies performed on Lavrion sulphidic tailings, application of fly ash at rates kg/t added alkalinity to the system, and reduced the overall hydraulic conductivity by. EPA///F SECOND INTERNATIONAL CONFERENCE ON NEW FRONTIERS FOR HAZARDOUS WASTE MANAGEMENT Proceedings SeptemberPittsburgh, Pennsylvania Sponsored by Hazardous Waste Engineering Research Laboratory Office of Research and Development U.S.

Environmental Protection Agency NUS Corporation Pittsburgh, PA National Science Foundation. MULTIMED, the Multimedia Exposure Assessment Model for Evaluating the Land Disposal of Wastes— Model Theory (EPA//SR/) A Subtitle D Landfill Application Manual for the Multimedia Exposure Assessment Model (MULTIMED) (EPA//SR/) Parameters Affecting the Measurement of Hydraulic Conductivity for.

ASTM. Standard test methods for measurement of hydraulic conductivity of saturated porous materials using a flexible wall permeameter (D). In Annual Book of ASTM Standards, Vol. American Society for Testing and Materials (ASTM), West Conshohocken, Penn. Google Scholar.

rate of to ± cm3/s, and a hydraulic conductivity of to cm/s. Introduction Carbon dioxide sequestration along with oil and gas production highly depends on factors such as permeability and hydraulic conductivity.1 The increase in concentration of atmospheric.

Bouwer, H. A double tube method for measuring hydraulic conductivity of soil in situ above a water table. Soil Sci. Soc. Proc. – Bouwer, H. Rapid fi eld measurement of air entry value and hydraulic conductivity of soil as signifi cant parameters in fl ow system analysis.

Water Resour. Res. – Bouwer, H. Environmental Geotechnics Related to Landfills of Municipal Solid Wastes Yun-Min Chen, Tony L. Zhan. Tdr Measurement System and The Application of Tdr in Geoenvironmental Engineering Ren-Peng Chen, Wei Chen, Yun-Min Chen.

The Status of Engineering Technical Standards of Waste Sanitary Landfill Treatment in China Yi-Xin Dong. The hydraulic conductivity function (HCF) is fundamental to hydrological characterization of unsaturated soils and is required for most analyses of water movement in unsaturated soils.

For instance, the HCF is a critical parameter to analyze the movement of water during infiltration or evaporation from soil specimens. This is relevant to the evaluation of water movement in landfill cover.

Specific conductance is a conductivity measurement made at or corrected to 25° C 3. This is the standardized method of reporting conductivity. As the temperature of water will affect conductivity readings, reporting conductivity at 25° C allows data to be easily compared 3.

Specific conductance is usually reported in uS/cm at 25° C 6. Conductivity measurements cover a wide range of solution conductivity from pure water at less than 1x S/cm to values of greater than 1 S/cm for concentrated solutions. In general, the measurement of conductivity is a rapid and inexpensive way of determining the ionic strength of a solution.

However, it. Mualem hydraulic conductivity relationship K(h) by linking HYDRUS-1D with a global genetic search algorithm: 2 l >@ 1 1/m m h =K s Se (3) where K s is the saturated hydraulic conductivity (m s-1), l (-) is a factor that accounts for the pore connectivity and tortuosity estimated by Mualem [3] to be as an average of many soils.

Table I.that design parameters such as soil type, hydraulic conductivity, cover thickness and slope of the drainage layer affected infiltration rate to a certain extent. However, for a given barrier, the hydraulic conductivity of the cover system was the most critical design parameter affecting water infiltration.Saturated hydraulic conductivity prediction from microscopic pore geometry measurements and neural network analysis I.

Lebron, M. G. Schaap, and D. L. Suarez U.S. Salinity Laboratory, ARS, USDA, Riverside, California Abstract. Traditional models to describe hydraulic properties in soils are constrained by.