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 15—The interval of time, Dt, can be measured directly using a stop watch or equivalent device, see In addition, if different size headwater and tailwater tubes are used, capillary head might have to be accounted for, see Appendix X1, X1. 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. Mercury can also be absorbed through the skin.

Drainage may be allowed from the base or top of the specimen, or simultaneously from both ends.

ASTM D5084

Any gradient equal to or less than the highest gradient yielding a similar hydraulic conductivity may be used for testing. The requirements outlined in 5. Soak the two porous end pieces and? For test specimens having a height to diameter ratio of about one, this value is about 0.

They shall be checked regularly to ensure that they are not clogged.

ASTM D Standard

Current edition approved Nov. Triaxial cell with accessories: Therefore, For overconsolidated consolidated soils: If the confining stress is less than the swell pressure, anomalous flow conditions my occur; for example, mercury column s move in the wrong direction.

Dimensions and mass of the test specimen shall be measured to the tolerances speci?

The key criterion is that the requirements covered in Section 5 have to be met. The water content of the trimmings shall be determined in accordance with Method D to the nearest 0. 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 of the test specimen.


The adoption of unsteady state measurements by ast, high-accuracy equipment along with the rigorous analyses for determining the hydraulic parameters this approach reduces testing duration according e5084 Zhang et al. After compaction, the test specimen shall be removed from the mold, the ends scari?

Temperatures outside this range may be used; however, the user would have to determine the speci? Determine which, if any, of the hydraulic conductivities k determined at these gradients are similar i.

A controlled high-humidity room is usually used for this purpose. Users of this standard are cautioned that compliance with Practice D does not in itself assure reliable results. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

asgm An accurate B-value determination can only be made if no gradient is acting on the specimen and all pore-water pressure induced by consolidation has dissipated. 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.

D — 03 shows that? NOTE 6—Most hydraulic conductivity tests are performed on cylindrical test specimens.

ASTM D, Test equipment Controls

The surface of the base and top cap that contacts the membrane to form a seal shall be smooth and free of scratches. To assist in removal of trapped air, a small hydraulic gradient may be applied across the specimen to induce?

D — 03 X2. The maximum value of an increment in back pressure 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 be subsequently consolidated.

In addition, they are representative of the significant digits that should generally be retained. A pressure gage, electronic pressure transducer, or any other device of suitable accuracy shall measure pressures to a minimum of three signi? That is, conform completion of primary consolidation before this determination; see Test Method D or D on how to con?


Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. If deformations are measured, the deformation indicator shall be a dial indicator or cathetometer graduated to 0. These schematics present the basic components needed to meet the objectives of Method E. Measure and record the? An explanation of how to measure DHc is given in X1. The key criterion is that the requirements covered in Section 5 have to be met.

The head loss shall be measured to a minimum of three signi? 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.

Compliance of the system in response to changes in pressure shall be minimized by using a stiff?

For this reason, distilled water is not usually recommended as a permeant liquid. Traps to prevent the accidental?

Active Risk Management

The testing time is ultimately controlled by meeting the equilibrium criteria for each Method see 9. In the system shown in Fig.

The ast of specimens equal to or greater than g shall be determined to the nearest gram. Tightening the temperature control. For normally consolidated soils: Also, when the initial and? The device for pressurizing the cell may consist of a reservoir connected to the permeameter cell and partially? Methods A, B, and C take axtm longer period-of-time, from a few days to a few weeks depending on the hydraulic conductivity.

A typical standard triaxial system with external data acquisition system includes: For this to occur the axial strain should be less than about 0.