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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Additional guidance on other drilling and sampling methods is given in Guide D It is either not feasible or too costly at this time to have ten or more laboratories participate in a round-robin testing program.
Measure and record these volumes at the start and end of each permeation trial as a minimum. There are six alternate methods or hydraulic systems that may be used to measure the hydraulic conductivity. Specimens shall be trimmed, whenever possible, in an environment where changes in water content are minimized. Please contact us for a complete offer. At no time during saturation of the system and specimen or hydraulic conductivity measurements shall the maximum applied effective stress be allowed to exceed that to which the specimen is to be consolidated.
Other strategies, such as using higher viscosity fluid or properly decreasing the cross-sectional area of the test specimen, or both, may also be possible. By tradition in U. Hydraulic conductivity varies with varying void ratio, which changes when the effective stress changes.
ASTM D Standard
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. To assist in removal astk trapped air, a small hydraulic gradient may be applied across the specimen to induce?
A schematic diagram of a typical permeameter cell and falling head raising tailwater hydraulic system is shown in Fig. If air pressure is used to control the back pressure, pressurized air will dissolve into the water, thus reducing the capacity of the water used for back pressure to dissolve air located in the pores r5084 the test specimen. The temperature shall be periodically measured and recorded.
Normally, this is accomplished by performing the test in a room with a relatively constant temperature. One approach would be to raise the headwater burette until the mercury levels top of menisci in the U-tube manometer headwater and tailwater columns are equal. If no gradient is speci? Compressible materials that are fully saturated with water will have a B value of 1. 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.
The head d504 across the permeameter shall be measured to a minimum of three signi? Water under atmospheric pressure shall be applied to the specimen base through the in?
Therefore, d508 results should be applied to field situations with caution and by qualified personnel. The easiest way to verify that volume changes are minor is to measure the height of the specimen during the back-pressuring process.
However, in some mercury U-tube manometers, the difference in capillary head between the headwater and tailwater tubes; i. D — 03 X1.
It is beyond the scope of this standard to consider significant digits used in analysis methods for engineering design. Standard triaxial configuration with built-in data acquisition can be used for performing additional tests such as CBR, Unconfined and CRS.
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NOTE 12—Seepage pressures associated with large hydraulic gradients can consolidate soft, compressible specimens and reduce their hydraulic conductivity. Maintain each increment of pressure for atm period of a few minutes to a few hours, depending upon the characteristics of the specimen. Any other measuring device meeting these requirements is acceptable. If the soil core is d0584 extruded vertically, care should be taken to avoid bending stresses on the core due to gravity.
Usually it is expressed in height of water, such as m or cm of water. A typical Standard triaxial system with analogue measurements includes: The piston or extensometer should pass d0584 a bushing and seal incorporated into the top plate and shall be loaded with sufficient force to compensate for the cell pressure acting over the cross-sectional area of the piston where it passes through the seal.