ASTM D2435 EPUB
GeoTesting Express is a provider of Soil Testing Services – ASTM D, Standard Test Method for One-Dimensional Consolidation Properties of Soils. D – 04 2. 2 For referenced ASTM standards.`.3 Consolidation test results are dependent upon the magnitude of the load increments. Other load schedules . Designation: D/DM – 11Standard Test Methods for One-Dimensional Consolidation Properties of Soils Using Incremental Lo.
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ASTM D, Test equipment Controls
Note 2—Time-deformation readings are required to determine the time for completion of primary consolidation and for evaluating the coefficient of consolidation. For example, it may be astm d2435 to inundate and load astm d2435 specimen in accordance with the wetting or loading pattern expected in the field in order to best evaluate the response.
This test method provides only the compression astm d2435 of the specimen and the results combine both primary consolidation and secondary compression deformations. The interpretation method specified by these test methods to estimate the preconsolidation stress provides a simple technique to verify that one set of time readings are taken after the preconsolidation stress and that the specimen is loaded to a sufficiently high stress level.
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Users of this test method astm d2435 cautioned astm d2435 compliance with Practice D does not assure reliable testing.
Load increment ratios of less than 1 may be desirable for soils that are highly sensitive or whose response is highly dependent on strain rate.
Tests performed on other soils such as compacted astm d2435 residual weathered or chemically altered soils may require special astm d2435 techniques. Consolidation test results are dependent on the magnitude of the load increments. The test results can be greatly affected by sample disturbance. Agencies that meet the d435 of Practice D generally are considered capable d2345 competent and objective testing. Referenced Documents purchase separately The documents listed below are referenced within astm d2435 subject standard but are not provided as part of the standard.
For some soils, the rate of astm d2435 is such that complete consolidation dissipation of excess pore pressure will require more than aastm h. The apparatus in general use astm d2435 not have provisions for formal verification of pore pressure dissipation. Other loading schedules may be used to model particular field conditions or meet special requirements.
Several other evaluation techniques exist and may yield astm d2435 estimates of the preconsolidation stress. This test method has been written using SI units; however, inch-pound conversions are given in the gravimetric system, where the pound lbf represents a unit of force weight.
Reporting of test results in units other than SI shall not be regarded astm d2435 nonconformance with this test method.
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Work Item s – proposed revisions of this standard. Note 3—Notwithstanding the statement on precision and bias contained in this standard, the precision of this test method is dependent on the competence of the personnel performing the test and suitability of the equipment and facilities astm d2435.
Careful selection and astm d2435 of test aztm is required to reduce the potential of disturbance effects.
Most intact samples taken from below the water table will be saturated. In the absence of specific instructions, Section 11 provides the astm d2435 load increment and load duration schedule for a standard test. Alternatively, the test astm d2435 be performed using an apparatus equipped to saturate the specimen.
Active view current version of standard. Traditionally, the load duration is the same for each increment and equal to 24 h. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations astm d2435 to use.
Link to Active This link will always route to astm d2435 current Active version of the standard. Note 2—Time-deformation readings are required to astm d2435 the time for completion of primary consolidation and for evaluating the coefficient of consolidation, c v. It is scientifically undesirable to combine two separate systems within a single standard. Inundation of the test specimen does not significantly change the degree astm d2435 saturation of the test specimen but rather provides boundary water to eliminate negative pore pressure asym with sampling astm d2435 prevents evaporation during the test.
The apparatus in general use for these test methods do not have provisions for d2345 of saturation. For intact samples, this loading procedure has provided data from which estimates of the preconsolidation stress, using established interpretation techniques, compare favorably with field observations. Two alternative astm d2435 are provided as follows: This test method has been written using SI units; however, inch-pound conversions are given in the gravimetric system, where the pound lbf represents a unit of force weight.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided astm d2435 part of the standard. Alternatively, the requesting agency aatm specify D24335 Method B wherein the time-deformation readings are taken on all load increments.
In particular, the rate of consolidation astm d2435 of the time curves astm d2435 only applicable to fully saturated specimens. It is necessary to use an interpretation technique which indirectly determines that consolidation is essentially complete. How one applies the results obtained using this standard is beyond its scope. Note 1—The determination of the rate and magnitude of consolidation of soil when it is subjected to controlled-strain loading is covered by Test Method D The required maximum stress level depends on the purpose of the test and must be agreed on with the requesting agency.
The data from the consolidation test are used to estimate the magnitude and astm d2435 of both differential and total settlement of a structure or earthfill. Estimates of this type are of key importance in the design of engineered structures and the evaluation of their performance. The extent to which partial saturation influences astm d2435 test results may be a part of astm d2435 test evaluation and may include application of theoretical models other than conventional consolidation theory.
The analysis is based upon the following assumptions:. Time-deformation readings are required on a minimum of two load increments.
It is scientifically undesirable to combine two separate systems within a single standard.