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The membrane shall be carefully inspected prior adtm use. D — 03 X2. There are six alternate methods or hydraulic systems that may be used to measure the hydraulic conductivity. NOTE 12—Seepage pressures associated with large hydraulic gradients can consolidate soft, compressible specimens and reduce their hydraulic conductivity.
However, v5084 accurate B-value determination, saturation should be con? Attach the cell pressure reservoir to the permeameter cell line and the hydraulic system to the in?
Flow volumes shall be measured by a graduated accumulator, graduated pipette, vertical standpipe in conjunction with an electronic pressure transducer, or other volume-measuring device of suitable accuracy. However, in some mercury U-tube manometers, the difference in capillary head between the headwater and tailwater tubes; i. These schematics present the basic components needed to meet the objectives of Method E.
However, the following items listed may be used: In the system shown in Fig. Finally, adjust the height of one burette typically the one connected to the astk line so the water level within each burette is equal. Water under atmospheric pressure shall be applied to the specimen base through the in? Therefore, the results should be applied to field situations with caution and by qualified personnel.
ASTM D Standard
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 the number of signi? If air bubbles come up from any point on the membrane, or if any visible? These lines can not have any air bubbles in them.
ASTM D, Test equipment Controls
The piston or extensometer should pass through 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.
Hydraulic conductivity varies with varying void ratio, which changes when the effective stress changes. Please contact us for a complete offer. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
Usually it is expressed in height of water, such as m or cm of water.
In making this height adjustment, make sure the water level in the headwater burette starts out below that of the tailwater burette. 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 d084.
For the constant-volume methods, the hydraulic conductivity typically has to be less than about 1 3 10? Any gradient equal to or less than the highest gradient yielding a similar hydraulic conductivity may be used for testing. Then, apply the same air pressure to these two burettes. Soil mechanics – Static triaxial systems: The water content of the trimmings shall be determined s5084 accordance with Method D to the nearest 0.
NOTE 14—The specimen may swell aztm removal of back pressure as a result of air coming out of solution. These hydraulic systems are as follows: Typically, the tailwater tube has a smaller area than the headwater tube to increase the sensitivity of?
The test is performed using a triaxial cell fit with 5 no-volume change valves: In that case, the specimen may be trimmed such that its longitudinal axis is perpendicular to the longitudinal axis of the sample. 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.
The maximum value of an increment in back d50884 shall be sufficiently low such that no point in the specimen is exposed to an effective stress in excess of that to which the specimen will d508 subsequently consolidated.
Flow measurement shall be aatm calibrated syringe, graduated pipette, or other device of suitable accuracy. In addition, measure and record any changes in the height of the test specimen, if being monitored see Note The inch-pound units given in parentheses are mathematical conversions, which are provided for information purposes only and are not considered standard, unless specifically stated as standard, such as 0.
A hydraulic system pressurized by deadweight acting wstm a piston or any other pressure device capable of applying and controlling the permeameter cell pressure within the tolerance prescribed in this paragraph may be used.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Other approaches, such as use of higher hydraulic gradients, lower viscosity astj, elimination of any possible aastm gradients and bacterial growth, and strict verification of leakage, may also be considered. 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.
Soil mechanics – D504 test: Fill the cell pressure reservoir with deaired water, or other suitable liquid, and the hydraulic system with deaired permeant water.
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Strategies that may be possible when dealing with such impervious materials may include the following. Link to Active This link will always route to the current Active version of the standard.
Continue permeation until at least four values of hydraulic conductivity are obtained over an interval of time in which the ratio of in? The mass and dimensions of the test specimen shall be determined to the tolerances given in 5.
Somewhat larger hydraulic gradients are usually used in the laboratory to accelerate testing, but excessive gradients must be avoided because high seepage pressures may consolidate the material, material may be washed from the specimen, or?
The last digit may be due to estimation, see 5. The heads involved are the total head Hpressure head Hpelevation head Hecapillary head Hcvelocity head Hvand total head loss h.
Any variation observed in the data is just as likely to be due to specimen variation as to operator or laboratory testing variation.