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Data acquisition can be shared with other soil testing equipment. Other items, such as use of higher hydraulic gradients, lower viscosity?
This value is positive if the inside diameter ID of the headwater tube is larger than the ID of the tailwater tube, and negative if the opposite is true.
Therefore, the volume of the saturated test specimen remains constant during permeation. The drainage lines shall be controlled by no-volume-change valves, such as ball valves, and shall be designed to minimize dead space in the lines.
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For normally consolidated soils: If the specimen is placed and compacted in layers, the surface of each previouslycompacted layer shall be lightly scari? Attach the cell pressure reservoir to the permeameter cell line and the hydraulic system to the in?
The key criterion is that the requirements covered in Section 5 have to be met. Record this value to two or three signi? Properly shortening the length or enlarging the cross-sectional area, or both, of the test specimen.
Measure and record, to a minimum of three signi? Place the membrane around the specimen, and using the membrane expander or other suitable O-ring expander, place one or more O-rings to seal the membrane to the base and one or more additional O-rings to seal the membrane to the top cap. Link to Active This link will always route to the current Active version of the standard.
ASTM D, Test equipment Controls
This is done for three reasons: Then, apply the same air pressure to these two burettes. This schematic of a 3 hydraulic system presents the basic components needed to meet the objectives of Method C.
The head loss across the permeameter shall be measured to a minimum of three signi? If boiling is used, care shall be taken not to evaporate an excessive amount of water, which can lead to a larger salt concentration in the permeant water than desired.
Continue permeation until at least four values of hydraulic conductivity are obtained over an interval astn time in which the ratio of in? Therefore, the results should be applied to field situations with caution and by qualified personnel. Experience has sometimes shown that hydraulic conductivities measured on small test specimens are not necessarily the same as larger-scale values. For this reason, distilled water is not usually recommended as a permeant liquid.
Finally, adjust the height of one burette typically the one connected to the headwater line so the water level within each burette is equal. Hydraulic conductivity varies with varying void ratio, which changes when the effective stress changes. If no gradient is speci?
Temperatures outside this range may be used, however, the user would have to determine the qstm gravity of mercury and R T see These lines can not have any air bubbles in them.
ASTM D Standard
Agencies that meet the criteria of Practice D are generally considered capable of competent and objective testing, sampling, inspection, etc.
It is beyond the scope of this standard to consider significant digits used in analysis methods for engineering dd5084. When the initial and?
Additional guidance on other drilling and sampling methods is given in Guide D The heads involved are the total head Hpressure head Hpelevation head Hecapillary head Hcvelocity head Hvand total head loss h.
In making this height adjustment, make sure the water level in the headwater burette starts out below that of the tailwater burette. For overconsolidated o clay, it is assumed that m in the overconsolidated range is reduced by the same ratio that the compression index C is when going from the normally consolidated region CNC to the overconsolidated region COC. Continue permeation until at least four values of hydraulic conductivity are obtained over an interval of time in which: The total volume of the specimen is maintained constant using this procedure, thereby signi?
The corrected diameter and actual length before the back pressure was removed are used to compute the volume of the test specimen prior to dismantling the cell.
Alternatively, measurements of the change in height of the test specimen can be used to con? Standard Test Method f 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.