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Wednesday, July 29, 2020 | History

3 edition of Effect of freeze-thaw on the hydraulic conductivity of barrier materials found in the catalog.

Effect of freeze-thaw on the hydraulic conductivity of barrier materials

Effect of freeze-thaw on the hydraulic conductivity of barrier materials

laboratory and field evaluation : project summary

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Published by U.S. Environmental Protection Agency, National Risk Management Research Laboratory in Cincinnati, OH .
Written in English

    Subjects:
  • Clay -- Effect of temperature on,
  • Pollution control equipment -- Linings -- Effect of temperature on

  • Edition Notes

    Other titlesEffect of freeze thaw on the hydraulic conductivity of barrier materials
    StatementJason F. Kraus and Craig H. Benson
    ContributionsBenson, Craig H, National Risk Management Research Laboratory (U.S.)
    The Physical Object
    FormatMicroform
    Pagination1 v
    ID Numbers
    Open LibraryOL18018852M

    Freezing changes the void ratio, structure, and fabric of the soil, which in turn produces increases in hydraulic conductivity. These findings are consistent with other information reported in the literature and indicate that compacted clay subjected to low effective confining stress should not be allowed to freeze if low hydraulic conductivity must be maintained. Therefore, the effect of freeze-thaw on the hydraulic conductivity is minimal, or the hydraulic conductivity may increase slightly. 3 The requestor must provide information regarding the effective stresses to be applied during testing, especially for determining the final hydraulic conductivity.

    buy astm d test method for determining the effect of freeze-thaw on hydraulic conductivity of compacted or intact soil specimens using a flexible wall permeameter from sai global. Freeze-thaw events can affect plant hydraulics by inducing embolism. This study analyzed the effect of temperature during the freezing process on hydraulic conductivity and ultrasonic emissions (UE). Stems of 10 angiosperms were dehydrated to a water potential at 12% percentage loss of hydraulic conductivity (PLC) and exposed to freeze-thaw by:

    Freeze-thaw effects have been well documented for compacted clay barriers which generally show an increase of hydraulic conductivity from one to three orders of magnitude. However, previous research indicates that sand-bentonite barriers are not affected by three dimensional freeze-thaw cycles. A laboratory testing program that was conducted to evaluate how freeze-thaw affects the hydraulic conductivity of three compacted clays is described. A parametric study was conducted to evaluate how the rate of freezing, temperature of freezing, dimensionality of freezing, and number of freeze-thaw cycles affect changes in hydraulic conductivity.


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Effect of freeze-thaw on the hydraulic conductivity of barrier materials Download PDF EPUB FB2

Results of the laboratory freeze-thaw tests on Parkview clay show that an in-crease in hydraulic conductivity of approxi-mately two orders of magnitude occurred as a result of freeze-thaw (Figure 2).

This increase in hydraulic conductivity is two orders of magnitude smaller than the in-crease in hydraulic conductivity occurring in the field. ABSTRACT ; Tests were performed in the laboratory to assess the impact jof freeze-thaw on the hydraulic conductivity of two compacted clays and three alternative barrier materials: a sand-bentonite mixture, three geosynthetic clay liners (GCLs), and three paper mill sludges.

The study material of this paper is remolded Shanghai forth layer soil, which is gray-black muddy clay soil. Several laboratory tests were carried out, such as freeze–thaw tests, hydraulic conductivity tests, MIP tests and SEM tests, to find out the effect of freeze–thaw on the hydraulic conductivity and microstructure of the study by: United States Environmental Protection Agency National Risk Management Research Laboratory Cincinnati, OH Research and Development EPA//SR/ August &EPA Project Summary Effect of Freeze-Thaw on the Hydraulic Conductivity of Barrier Materials: Laboratory and Field Evaluation Jason F.

Kraus and Craig H. Benson Laboratory tests were conducted on barrier materials to determine if their hydraulic conductivity changes as a result of freezing and thawing.

in permeability (hydraulic conductivity) were determined with respect ~o the number of freeze/thaw cycles. Triaxial permeability tests were performed at chamber pressures of 69 kPa (10 psi), resulting in observed increases in permeability of about one orderFile Size: KB.

highlighting the effects of freeze–thaw cycles on the hydraulic conductivity of compacted clayey silt samples and, in parti-cular, the role of the energy level applied in the compaction phase. The compaction energy is considered as a particularly relevant factor of influence, on density and hydraulic con.

This condition is commonly considered not to be as critical as the case of compaction at the wet side, in terms of the freeze–thaw effects on the hydraulic conductivity. The degrees of saturation range from 68% (low compaction samples) to 86% (high compaction), while the void ratios range from (high compaction) to (low compaction).Cited by: Several studies have shown that freeze–thaw causes changes in the hydraulic conductivity of compacted clays.

Cracks formed by ice lensing and shrinkage cause the hydraulic conductivity to. A laboratory testing program that was conducted to evaluate how freeze-thaw affects the hydraulic conductivity of three compacted clays is described. A parametric study was conducted to evaluate how the rate of freezing, temperature of freezing, dimensionality of freezing, and number of freeze-thaw cycles affect changes in hydraulic by: On the other hand, freeze-thaw cycles are demonstrated to irreversibly increase the hydraulic conductivity of the grouting materials used to seal off the probes by two to three orders of magnitude.

This paper reports the effect of the freeze-thaw on the suspension stability, particle size distribution, and thermal conductivity of EG/water-based nanofluids containing Al 2 O 3 nanoparticles that can be used as improved working fluid for cooling systems.

The EG/water-based Al 2 O 3 nanofluids were prepared using a two-step method with a nanodisperser and decanting by: 1. paper will study the effects of freeze–thaw on hydraulic conductivity and microstructure of soft soil with different water contents in Shanghai Area.

Chamberlain and Gow () found that freezing and thawing could lead to void ratio reduction and hydraulic conductivity increase, which has been confirmed by lots of.

stabilization by varying the freeze-thaw cycles. Results shows that addition of 6% of lime increased the hydraulic conductivity of the specimens times after only 3 freeze-thaw for both clays. The strength of high plastic clay increased about 15 times at the end of 28 day curing.

«Laboratory Testing to Evaluate Changes in Hydraulic Conductivity of Compacted Clays Caused by Freeze-thaw,’ in Daniel, D.E., and Trautwein, S.J. (eds.), Hydraulic Conductivity and Waste Contaminant Transport in Soils, ASTM STPAmerican Society for Testing and Materials, Philadelphia, PA.

– Google ScholarCited by: Laboratory test study on the effect of freeze–thaw cycles on strength and hydraulic conductivity of high water content stabilized dredged sediments. Gregory Makusa, a Josef Mácsik, b Göran Holm, c Sven Knutsson a.

a Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, SE, Luleå, by: 9. Get this from a library. Effect of freeze-thaw on the hydraulic conductivity of barrier materials: laboratory and field evaluation: project summary.

[Jason F Kraus; Craig H Benson; National Risk Management Research Laboratory (U.S.)]. In this study, hydraulic conductivity tests were conducted to assess how freeze-thaw cycling affects the hydraulic conductivity of a soil-bentonite mixture.

The permeating fluids were tap water and fluids containing divalent cations at concentrations representative of. Freeze-thaw events can affect plant hydraulics by inducing embolism. This study analyzed the effect of temperature during the freezing process on hydraulic conductivity and ultrasonic emissions (UE).

The mean GCL hydraulic conductivity with respect to water is shown to be 3 m/s before freeze–thaw. The mean hydraulic conductivities after up to freeze–thaw cycles did not change sig-nificantly, and were in the range – 3 m/s.

Freeze-thaw events can affect plant hydraulics by inducing embo lism. This study analyzed the effect of temperature during the freezing process on hydraulic conductivity and ultrasonic emi ssions (UE). Stems of 10 angiosperms were dehydrated to a water potential at 12% percentage loss of hydraulic conductivity (PLC) a nd exposed to freeze-thaw Cited by:.

Number of freeze-thaw cycles Hydraulic conductivity (cm/sec). Moisture content 30% Moisture content 35% Moisture content 40% Moisture content 45% Figure 6. Hydraulic conductivity and number of freeze-thaw cycles for samples from I site 1.E 1.E 1.E 0 2 4 6 8 10 12 Number of freeze-thaw cycles Coefficient of consolidation (cm 2 /sec)File Size: 1MB.A study was conducted to assess the effect of cation exchange concurrent with freeze–thaw cycling on the hydraulic conductivity of a geosynthetic clay liner (GCL).

GCLs were prehydrated by contact Cited by: Effect of freeze–thaw cycles on the hydraulic conductivity of PP The obtained results show that the hydraulic conductivity of PP samples compacted wet of optimum is affected by the freeze–thaw cycles.

However, the changes in the hydraulic conductivity are less than one order of by: