GeoTesting Express is a provider of Soil Testing Services – ASTM D, Standard Test Methods for Measurement of Hydraulic Conductivity of Saturated Porous. All the Controls products ASTM D standard. Enter now!. Standard Test Method for Measurement of Hydraulic Conductivity of Saturated Porous Materials Using a Flexible Wall Permeameter.
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NOTE 14—The specimen may swell after removal of back pressure as a result of air coming out of solution. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
The total head loss by de? Also, measure and record any changes in specimen height, if being monitored. Usually it is expressed in height of water, such as m or cm satm water.
Alternatively, measurements of the change in height of the test specimen can be used to con? There are six alternate methods or hydraulic systems that may be used to measure the hydraulic conductivity.
Units other than second smeters metc. Therefore, For overconsolidated consolidated soils: These lines can not have any air bubbles in them. After all visible air has been removed from the? These hydraulic systems are as follows:. NOTE 15—The interval of time, Dt, can be measured directly using a stop watch or equivalent device, see In addition, measure and record any changes in the height of the test specimen, if being monitored see Note The mass of specimens equal to or greater than g shall be determined to the nearest gram.
If it is not, there is an error in applying equal pressures to the two tubes of the U-tube manometer, check for air in the lines, external pressure source, etc.
Experience has sometimes shown that hydraulic conductivities measured on small test specimens are not necessarily the same as largerscale values. Temperatures outside this range may be used; however, the user would have to determine the specific gravity of mercury and R T see The testing time is ultimately controlled by meeting the equilibrium criteria for each Method see 9.
Permeation with other liquids, such as chemical wastes, can be accomplished using procedures similar to those described in these test methods. Any gradient equal to or less than the highest gradient yielding a similar hydraulic conductivity may be used for testing. The specimen may swell when exposed to water; the effective stress will tend to counteract the swelling.
Apply a small con? In areas with extremely hard or soft water, the CaCl2 solution is recommended.
The schematic of the hydraulic system in Fig. If an electronic pressure transducer or other measuring device is to asstm used during the test to measure pore pressures or applied hydraulic gradient, bleed any trapped air from the device. Maintain each increment of pressure for a period of a few minutes to a few hours, depending upon the characteristics of the specimen. This schematic of a 3 hydraulic system presents the basic components needed to meet the objectives ast Method C. Consolidation shall be accomplished in stages, with the increase in cell pressure minus back pressure effective stress in each new stage equal to or less than the effective stress in the previous stage i.
NOTE 12—Seepage pressures associated with large hydraulic gradients can consolidate soft, compressible specimens and reduce their hydraulic conductivity. They sstm be checked regularly to ensure that they are not clogged.
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At the start and end of each asmt, as a minimum, measure and record any changes in the height of the test specimen, if being monitored. More information on testing with a constant rate of? D — 03 shows that? First, to increase the sensitivity of the?
Triaxial cell with accessories: Conditions at the time of awtm extrusion may dictate the direction of removal, but the principal concern is to keep the degree of disturbance minimal.
For instance, if k is very sensitive to volume changes then the effective consolidation stress needs to be accurately controlled; also, any volume changes during the back-pressuring process would have to be minimized.
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Also, the initial degree of saturation shall be estimated this information may be used later in the back-pressure stage. Asfm on the asstm, an initial void ratio of 0. Precision and Bias Place the membrane around the specimen, and using the membrane expander or other suitable O-ring expander, place one or more O-rings to seal the membrane to the base and one or more additional O-rings to seal the membrane to the top cap.
However, in some mercury U-tube manometers, the difference in capillary head between the headwater and tailwater tubes; i. Determine which, if any, of the hydraulic conductivities k determined at these gradients are similar i.