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The surface of the test specimen may 8 5. NOTE 5—For guidance or avoiding excessive consolidation in the use of vacuum for specimen saturation, consult 8.
However, these test methods are only intended to be used when water is the permeant liquid. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. In addition, they are representative of the signi? A typical Standard triaxial system with analogue measurements includes: However, the following items listed may be used: The water content of the trimmings shall be determined in accordance with Method Dto the nearest 0.
There are now two? At no time shall a head be applied such that ashm effective con? 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.
More information on testing with a constant rate of? However, for accurate B-value determination, saturation should be con? 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.
This value is positive if ast, inside diameter ID of the headwater tube is larger than the ID of the tailwater tube, and negative if the opposite is true. The new subsection states that such CV hydraulic systems should not be used to study the time or pore-? Then carefully disassemble the permeameter cell and remove the specimen.
Falling head tests may be performed with either a constant tailwater elevation Method B or a rising tailwater elevation Method Csee Fig. To prevent such problems, the mercury and tubes have to remain relatively clean.
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D — 03 NOTE—For this case capillary head loss is a positive value since the total head on the head water side would have to be increased to make the mercury levels equal. Also, the back pressure and consolidation phases may be completed concurrently if back pressures are applied sufficiently slowly to minimize potential for overconsolidation of the specimen. Units other than seconds smeters metc.
This air pressure should be similar to the back pressure applied during testing. Precision and Bias A superscript epsilon e indicates an editorial change since the last revision or reapproval.
The mercury level in the tailwater tube one with a smaller ID should be below that in the headwater tube. Standard triaxial configuration with built-in data acquisition can be used for performing additional tests such as CBR, Unconfined and CRS. The piston or extensometer should pass through a bushing and seal incorporated into the top plate and shall be loaded with sufficient force to compensate for the cell pressure acting over the cross-sectional area of the piston where it passes through the seal.
However, measurement of the B coefficient as described in 9.
The membrane shall be carefully inspected prior to use. Other items, such as use of higher hydraulic gradients, lower viscosity? 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.
In each of these systems, the mercury-? Temperatures outside this range may be used, however, the user would have to determine the specific gravity of mercury and R T see Units other than second smeters metc. Also, measure and record any changes in specimen height, if being monitored. NOTE 7—Soaking under vacuum is applicable when there are continuous air voids in the specimen e.
Also, use of a long approximately 5 to 7 m tube connecting the pressurized cell liquid to the cell helps to delay the appearance of air in the cell?
ASTM D Standard
Properly sized tubing, etc. Other items, 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. 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.
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 ast, air from the device.
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.
ASTM D, Test equipment Controls
Methods A, B, and C take a longer period-of-time, from a few days to a few weeks depending on the hydraulic conductivity. Therefore, such tubing should be enclosed. Standard Test Method f A discussion on capillary head is given in Appendix X1, X1. The specimen may swell when exposed to 5d084 the effective stress will tend to counteract the swelling.