GeoTesting Express is a provider of Soil Testing Services – ASTM D, Standard Test Methods for Measurement of Hydraulic Conductivity of Saturated Porous. All the Controls products ASTM D standard. Enter now!. Standard Test Method for Measurement of Hydraulic Conductivity of Saturated Porous Materials Using a Flexible Wall Permeameter.
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If air pressure is used to control the back pressure, pressurized air will dissolve into the water, thus reducing the capacity of the water used for back pressure to dissolve air located in the pores of the test specimen. For this reason, distilled water is not usually recommended as a permeant liquid. NOTE 14—The specimen may swell after removal of back pressure as a result of air coming out of solution.
Therefore, where-ever practical use stainless steel? 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.
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ASTM D Standard
The B value may be measured prior to or after completion of the consolidation phase see 9. The gas pressure shall be controlled by a pressure regulator and measured by a pressure gage, electronic pressure transducer, or any other device capable of measuring to the prescribed tolerance.
Place the membrane around the specimen, and using the membrane expander or other suitable D504 expander, place one or more Astk to seal the membrane to the base and one or more additional O-rings to seal the membrane to the top cap. Then carefully disassemble the permeameter cell and remove the specimen.
Hydraulic conductivity varies with varying void ratio, which changes when the effective stress changes.
Home Products Search results Results for: 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.
Soil mechanics – Permeability test: Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A different approach is required since the mercury level in the tailwater tube is not visible at equilibrium. NOTE 1—The quality of the result produced by this standard is dependent of the competence of the personnel asgm it and the suitability of the equipment and facilities used.
If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. A superscript epsilon e indicates an editorial change since the last revision or reapproval. As shown in Fig. 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. A controlled high-humidity room is usually used for this purpose.
These hydraulic systems are as follows:. TRITECH original high-performance load frames for triaxial tests, ideal solution for advanced and research laboratories that perform high quality tests at high productivity levels.
Soil mechanics – Static triaxial systems: To prevent such problems, the mercury and tubes have to remain relatively clean. There are six d50884 methods or hydraulic systems that may be used to measure the hydraulic conductivity.
These test methods apply to water-saturated porous materials containing virtually no air. Current edition approved Nov.
Specimens obtained by tube sampling or coring may be tested without trimming except for cutting the end surfaces plane and perpendicular to the longitudinal axis of the specimen, provided soil characteristics are such that no signi?
The head loss across the asgm shall be measured to a minimum of three signi? NOTE 10—The test specimen may be consolidated prior to application of back pressure.
Rubber gloves should be worn at all times when contact with mercury is possible. The water content of the trimmings shall be determined in accordance with Method D to the nearest 0. These effects could increase or decrease hydraulic conductivity. A discussion on capillary head is given in Appendix X1, X1.
In addition, it is either not feasible or too costly to produce multiple specimens that have uniform physical properties.
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.
NOTE 6—Most hydraulic conductivity tests are performed on cylindrical test specimens.
For the constant-volume methods, the hydraulic conductivity typically has to be less than about 1 3 10? Compliance of the system in response to changes in pressure shall astn minimized by using a stiff?
The pressure head is the c5084 of a vertical column of static water that can ashm supported by the static pressure p at a given point. Methods A, B, and C take a longer period-of-time, from a few days to a few weeks depending on the hydraulic conductivity. Compressible materials that are fully saturated with water will have a B value of 1.
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. Mercury can also be absorbed through the skin. The schematic of the hydraulic system in Fig.