Active, Most Current. These test methods may be utilized on all specimen types intact, reconstituted, remolded, compacted, etc. Other strategies, such as using higher viscosity fluid or properly decreasing the crosssectional area of the test specimen, or both, may also be possible. The key criterion is that the requirements covered in Section 5 have to be met.
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Historical Version s - view previous versions of standard. More D These test methods apply to water-saturated porous materials containing virtually no air. Permeation with other liquids, such as chemical wastes, can be accomplished using procedures similar to those described in these test methods. However, these test methods are only intended to be used when water is the permeant liquid.
See Section 6. Hydraulic conductivity varies with varying void ratio, which changes when the effective stress changes. If the void ratio is changed, the hydraulic conductivity of the test specimen will likely change, see Appendix X2.
To determine the relationship between hydraulic conductivity and void ratio, the hydraulic conductivity test would have to be repeated at different effective stresses. Experience has sometimes shown that hydraulic conductivities measured on small test specimens are not necessarily the same as larger-scale values. Therefore, the results should be applied to field situations with caution and by qualified personnel.
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. Agencies that meet the criteria of Practice D are generally considered capable of competent and objective testing, sampling, inspection, etc..
Users of this standard are cautioned that compliance with Practice D does not in itself assure reliable results. Reliable results depend on many factors; Practice D provides a means of evaluating some of those factors. Temperatures outside this range may be used; however, the user would have to determine the specific gravity of mercury and R T see There are six alternate methods or hydraulic systems that may be used to measure the hydraulic conductivity.
These hydraulic systems are as follows:. 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.
The key criterion is that the requirements covered in Section 5 have to be met. Strategies that may be possible when dealing with such impervious materials may include the following: a controlling the temperature more precisely, b adoption of unsteady state measurements by using high-accuracy equipment along with the rigorous analyses for determining the hydraulic parameters this approach reduces testing duration according to Zhang et al.
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. In addition, they are representative of the significant digits that should generally be retained. 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.
It is beyond the scope of this standard to consider significant digits used in analysis methods for engineering design. Typically a test can be performed using Methods D, E, or F within two to three days. Methods A, B, and C take a longer period-of-time, from a few days to a few weeks depending on the hydraulic conductivity. The testing time is ultimately controlled by meeting the equilibrium criteria for each Method see 9. 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.
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. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Scope 1. These hydraulic systems are as follows: 1. Link to Active This link will always route to the current Active version of the standard.
Standard Test Method f A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Temperatures outside this range may be used; however, the user would have to determine the speci? There are six alternate methods or hydraulic systems that may be used to measure the hydraulic conductivity.
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Historical Version s - view previous versions of standard. More D These test methods apply to water-saturated porous materials containing virtually no air. Permeation with other liquids, such as chemical wastes, can be accomplished using procedures similar to those described in these test methods.