ASTM D5084 PDF

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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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. However, measurement of the B coefficient as described in 9.

Therefore, the results should be applied to? The requirement that the head loss not decrease very much is intended to keep the effective stress from changing too much. NOTE 6—Most hydraulic conductivity tests are performed on cylindrical test specimens.

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Place one porous end piece on the base and place one? Triaxial cell with accessories: Temperatures outside this range may be used, however, the user would have to d084 the specific gravity of mercury and R T see That is, conform completion of primary consolidation before this determination; see Test Method D or D on how to con?

The volume prior to dismantling the cell is used to sstm the? The head loss shall be measured to a minimum of three signi? The new subsection states that such CV hydraulic systems should not be used to study the time or pore-?

ASTM D, Test equipment Controls

The mercury level in the tailwater tube one with a smaller ID should be below that in the headwater tube. If Hydromatic standalone pressure unit is selected, a separate volume change device is not required. To guard against such errors, the permeameter shall be assembled with no specimen inside and then the hydraulic system? 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.

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Strategies that may be possible when dealing with such impervious materials may include the following. NOTE 11—The procedure in 9. However, the use of small hydraulic gradients can lead to very long testing times for materials having low hydraulic conductivity less than about 1 3 10? In designing this type of hydraulic system, the area of the tailwater tube aout is made signi?

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. D — 03 pressure less than the con?

Standard Test Method f To assist in removal of trapped air, a small hydraulic gradient may be applied across the specimen to induce? Then carefully disassemble the permeameter cell and remove the specimen. The mass and dimensions of the test specimen shall be determined to the tolerances given in 5.

In addition, measure and record any changes in the height of the test specimen, if being monitored see Note Last previous edition approved in as D — 00e1. The testing time is ultimately controlled by meeting the equilibrium criteria for each Method see 9. NOTE 1—The quality of the result produced by this standard is dependent of the competence of the personnel performing it and the suitability of the equipment d5804 facilities used.

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The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any d5804 for the user’s objectives; and it is common practice to increase or reduce significant digits of reported data to be atsm with these considerations. Based on the above, an initial void ratio of 0.

Also, the initial degree of saturation shall be estimated this information may be used later in the back-pressure stage. A schematic diagram of a typical permeameter cell and falling head raising tailwater hydraulic system d50084 shown in Fig.

Other items, such as use of higher hydraulic gradients, lower viscosity?

ASTM D Standard

Drainage may be allowed from the base or top of the specimen, or simultaneously from both ends. The back pressure may be provided by a compressed gas supply, a deadweight acting on a piston, or any other d584 capable of applying and controlling the back pressure to the tolerance prescribed in this paragraph.

To prevent dissolution of air back into the water, deaired water shall not be exposed to air for prolonged periods. This can be accomplished by individually connecting the tailwater and headwater tubing lines to clean burettes containing water asrm equal elevation. A controlled high-humidity room is usually used for this purpose.

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