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Therefore, it has to be accounted for as shown in Fig. The testing time is ultimately controlled by meeting the equilibrium criteria for each Method see 9. In addition, measure and record any changes in the height of the test specimen, if being monitored see Note 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.
Each of these readings will have some error, especially the headwater reading.
Methods A, B, and C take a longer period-of-time, from a few days to a few weeks depending on the hydraulic conductivity. 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. These hydraulic systems are as follows: The system shall be capable of maintaining the applied back pressure throughout the duration of hydraulic conductivity measurements.
These schematics present the basic components needed to meet the objectives of Method E. Strategies that may be possible when dealing with such impervious materials may include the following. Satm back pressure may be provided aztm a compressed gas supply, a deadweight acting on a piston, or asm other method capable of applying and controlling the back pressure to the tolerance prescribed in this paragraph.
D — 03 FIG.
ASTM D Standard
It is beyond the scope of this standard to consider signi? Continue permeation asstm at least four values of hydraulic conductivity are obtained over an interval of time in which the ratio of in? Properly shortening the length or enlarging the cross-sectional area, or both, of the test specimen.
The key criterion is that the requirements covered in Section 5 have to be met. Your comments are invited either for revision of this standard or for additional standards and should ast addressed to ASTM International Headquarters.
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In addition, if different size headwater and tailwater tubes are used, capillary head might have to be accounted for, see Appendix X1, X1. Measure and record these head losses at the start and end of each permeation trial as a minimum.
NOTE 15—The interval of time, Dt, can be measured directly using a stop watch or equivalent device, see A pressure gage, electronic pressure transducer, or any other device of suitable accuracy shall measure pressures to a minimum of three signi? With this understanding, one can thereby know the accuracy to which volume changes need to be controlled while testing. Additional de-airing may modify the concentration of this solution slightly, but this should not affect the hydraulic conductivity.
Please contact us for a complete offer. TRITECH original high-performance load frames for triaxial tests, ideal solution for advanced and research laboratories to perform high quality tests at. This can be accomplished by individually connecting the tailwater and headwater tubing lines to clean burettes containing water at equal elevation.
The total head loss by de? Apply a small con? Permeation with other liquids, such as chemical wastes, can be accomplished using procedures similar to those described in these test methods. For the system showed in Fig.
Traps to prevent the accidental? This height differential is caused by the difference in capillary pressure heads within the two tubes making up the mercury U-tube manometer, see X1. NOTE 7—Soaking under vacuum is applicable when there are continuous air voids in the specimen e. If the void ratio is changed, the hydraulic conductivity of the test specimen will likely change, see Appendix X2.
Reliable results depend on many factors; Practice D provides a means of evaluating some of those factors. In the system shown in Fig. Standard triaxial configuration with external data acquisition can be used for performing additional test such as CBR, Unconfined and CRS, Permeability.
Compliance of the system in response to changes in pressure shall be minimized by using a stiff? There are six alternate methods or hydraulic systems that may be used s5084 measure the hydraulic conductivity.
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 mass and dimensions of the test specimen shall be determined to the tolerances given in 5.
It is beyond the scope of this standard to consider significant digits used in analysis methods for engineering design. The schematic of the hydraulic system in Fig.
The effects of mercury are cumulative. To prevent such problems, the mercury and tubes have to remain relatively clean. The temperature shall be periodically measured and recorded.