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Other strategies, such as using higher viscosity?
The device for pressurizing the cell may consist of a reservoir connected to the permeameter cell and partially? Other approaches, such as use of higher hydraulic gradients, lower viscosity fluid, elimination of any possible chemical gradients and bacterial growth, and strict verification of leakage, may also be considered.
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Units other than seconds smeters metc. Data acquisition is included in the load frame; four channels are available for load, displacement, pore pressure and volume v5084. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user’s objectives; and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations.
Historical Version s – view previous versions of standard. Experience has sometimes shown that hydraulic conductivities measured on small test specimens are not necessarily the same as largerscale values.
ASTM D, Test equipment Controls
D — 03 FIG. 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. More information on testing with a constant rate of? D — 03 X2.
ASTM D Standard
Soak the two porous end pieces and? Tightening the temperature control.
At the start and end of each trial, as a minimum, measure and record any changes in the height of the test specimen, if being monitored. The temperature shall be periodically measured and recorded.
These test methods apply to water-saturated porous materials containing virtually no air. It is beyond the scope of this standard to consider signi?
In addition, for a given change in void ratio De the rate of change in k is much more dramatic in the overconsolidated range than in the normally consolidated range. If Hydromatic standalone pressure unit is selected, a separate volume change device is not required. A different approach is required since the mercury level in the tailwater tube is not visible at equilibrium.
These schematics present the basic components needed to meet the objectives of Method E. However, the use of small hydraulic gradients can lead to very long testing times for materials having low hydraulic conductivity r5084 than about 1 3 10?
Typically a test can be performed using Methods D, E, or F within two to 2 The boldface d5804 in parentheses refer to the list of references appended to this standard. The gas pressure shall be controlled by a pressure regulator and measured by a pressure gage, electronic pressure transducer, or any other device capable of measuring to the prescribed tolerance.
The inch-pound units given in parentheses are mathematical conversions, which are provided astk information purposes only and are not considered standard, unless specifically stated as standard, such as 0. In making this height adjustment, make sure the water level in the headwater burette starts out below that of the tailwater burette.
D — 03 NOTE—For this case capillary head loss is a positive value since the total head on the head water side would have to be increased to make the mercury levels equal. It is d55084 the scope of this standard to consider significant digits used in analysis methods for engineering design.
The mass of specimens less than g shall be determined to the nearest 0. To assist in removal of trapped air, a small hydraulic gradient may be applied across the specimen to induce? Measure and record, to a minimum of three signi?
NOTE 1—The quality of the result produced by this standard is dependent of aastm competence of the personnel performing it and the suitability of the equipment and facilities used. The paper shall have a negligibly small hydraulic impedance.
Therefore, the volume of the v5084 test specimen remains constant during permeation. Also, the initial degree of saturation shall be estimated this information may be c5084 later in the back-pressure stage. For the constant-volume methods, the hydraulic conductivity typically has to be less than about 1 3 10?