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The 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. Periodically measure the rate of in?
NOTE 10—The test specimen may be consolidated prior to application of back pressure.
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. D — 03 between hydraulic conductivity and void ratio, the hydraulic conductivity test would have to be repeated at d5048 effective stresses.
If no gradient is speci? Additional guidance on other drilling and sampling methods is given in Guide D This is done for three reasons: That is the time interval has to be greater than 9 s unless the time is recorded to the nearest 0.
These lines can not have any air bubbles in them. Typically, the tailwater tube has a smaller area than the headwater tube to increase d0584 sensitivity of?
For instance, if k is very sensitive to volume changes then the effective consolidation stress needs to be accurately controlled; also, any volume changes during the back-pressuring process would have to be minimized. Alternatively, measurements of the change in height of the test specimen can be used to con?
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Also, when the initial and? In areas with extremely hard or soft water, astj CaCl2 solution is recommended. To prevent such problems, the mercury and tubes have to remain relatively clean.
The back qstm shall be maintained throughout the permeation phase. If an electronic pressure transducer or other measuring device is to be used during the test to measure pore pressures or applied hydraulic gradient, bleed any trapped air from the device.
ASTM D, Test equipment Controls
Traps to prevent the accidental? Rigid tubing, such as metallic or rigid thermoplastic tubing, or glass shall be used. 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.
However, d55084 test methods are only intended to be used when water is the permeant liquid. Permeation with other liquids, such as chemical wastes, can be accomplished using procedures similar to those described in these test methods. Any variation observed in the data is just as likely to be due to specimen variation as to operator or laboratory testing variation.
The mass of specimens equal to or greater than g shall be determined to the nearest gram.
If the void ratio is changed, the hydraulic conductivity of the test specimen will likely change, see Appendix X2. Data are automatically transferred to the PC in real time for live plotting and monitoring of the tests in c5084.
The effluent tailwater pressure shall not be decreased because air bubbles that were dissolved by the specimen water during backpressuring may come out of solution if the pressure is decreased. If the soil core is not extruded vertically, care should be taken to avoid bending stresses on the core due to gravity.
ASTM D Standard
These test methods apply to water-saturated porous materials containing virtually no air. Attach the cell pressure asgm to the permeameter cell line and the hydraulic system to the in?
NOTE 1—The quality of the result produced by this standard is dependent astj the competence of the personnel performing it and the suitability of the equipment and facilities used.
The system shall be capable of maintaining the applied back pressure throughout the duration of hydraulic conductivity measurements.
Active Risk Management
Any gradient equal to or less than the highest gradient yielding a similar hydraulic conductivity may be used for testing. Link to Active This link will always route to the current Active version of the standard. 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.
All the data acquisition and test management are made in manual mode Power supply is only required for air compressor and for triaxial load frame during failure stage. The requirement that the head loss not decrease very much is intended to keep the effective stress from changing too much. Home Products Search results Results for: The total volume of the specimen is maintained constant using this procedure, thereby signi?
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Therefore, where-ever practical use stainless steel? Standard triaxial configuration with built-in data acquisition can be used for performing additional tests such as CBR, Unconfined aztm CRS.
Then, apply the same air pressure to these two burettes.
The surface of the test specimen may 8 5. This air pressure should be similar to the back pressure applied during testing. In that case, the specimen may be trimmed such that its longitudinal axis is perpendicular to the longitudinal axis of the sample.