Standard Test Method for One-Dimension Consolidation Properties of Soil Using Incremental Loading. GeoTesting Express is a provider of Soil Testing Services – ASTM D, Standard Test Method for One-Dimensional Consolidation Properties of Soils. Buy ASTM D TEST METHODS FOR ONE-DIMENSIONAL CONSOLIDATION PROPERTIES OF SOILS USING INCREMENTAL.
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The values stated in inch-pound units are approximate and given for guidance only. Traditionally, the axial stress is doubled for each increment resulting in a load increment ratio of 1.
The addition of back pressure saturation does not constitute non-conformance to these test methods.
ASTM D Standard
Work Item s – proposed revisions of this standard. Equipment is available to perform consolidation tests using back pressure saturation.
The test results can be greatly affected by sample disturbance. This implicitly combines two separate systems of units, that is, the absolute system and the gravimetric system. Inundation of the test specimen does not significantly change the degree of saturation of the test specimen but rather provides boundary water to eliminate negative pore pressure associated with sampling and prevents evaporation during the test. How one applies the results obtained using this standard is beyond its scope.
Other loading schedules may be used to model particular field conditions or meet special requirements. Tests performed on other soils such as compacted and residual weathered or chemically altered soils may require special evaluation techniques.
Two alternative procedures are provided as follows: Since c v varies with stress level and loading type loading or unloadingthe load increments with timed readings must be selected with specific reference to the individual project.
Alternatively, the requesting agency may specify Test Method B wherein the time-deformation readings are taken on all load increments. Link to Active This link will always route to the current Active version of the standard. The apparatus in general use for these test methods do not have provisions for verification of saturation. Note 3—Notwithstanding the statement on precision and bias contained in this standard, the precision of astj test method is dependent on the competence of the personnel performing dd2435 test and suitability of the equipment and facilities used.
The compressibility of soil particles and pore water is negligible compared to the compressibility of the soil skeleton. It is necessary to use an interpretation technique which indirectly determines that consolidation is essentially complete.
This implicitly combines two separate systems of units, that is, the absolute system and the gravimetric system. It is scientifically undesirable to combine two separate systems within a single standard. Evaluation techniques specified in these test methods assume the pore space is fully saturated and are generally applicable to soils naturally sedimented in water.
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 Consolidation test results are dependent upon the duration of atsm load increment.
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. The extent to which partial saturation influences the test results may be a part of the test evaluation and may include application of theoretical models other than conventional consolidation theory.
For example, it may be desirable to inundate and load the specimen in accordance with the wetting or loading pattern expected in the field in order to best evaluate the response.
Active view current version of standard. Historical Version s – view previous versions of standard. Time-deformation readings are required on a minimum of two load increments.
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. Time-deformation readings are required on a minimum of two load increments.
Users of this test method are cautioned that compliance with Practice D does not assure reliable testing. This test method provides only the compression curve of the specimen and the results combine both primary consolidation and secondary compression deformations. The data from the consolidation test are used to estimate the magnitude and rate of both differential and total settlement of a structure or earthfill. Agencies that meet the criteria of Practice D generally are considered capable of competent and objective testing.
It is scientifically undesirable to combine two separate systems within a single standard.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Reporting of test results in units other than SI shall not be regarded as nonconformance with this test method. These test methods use conventional consolidation theory based on Terzaghi’s consolidation equation to compute the coefficient of consolidation, c v.
The analysis is based upon the following assumptions:. These test methods specify procedures for two techniques Method A and Method Bhowever alternative techniques may be used when agreed to by the requesting agency and still be in conformance with these test methods.