Designation: D/DM – 11Standard Test Methods for One-Dimensional Consolidation Properties of Soils Using Incremental Lo. GeoTesting Express is a provider of Soil Testing Services – ASTM D, Standard Test Method for One-Dimensional Consolidation Properties of Soils. Standard Test Method for One-Dimension Consolidation Properties of Soil Using Incremental Loading.
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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. Link to Active This link will always route to the current Active version of the standard. Equipment is available to perform consolidation tests using back pressure s2435. Inundation of the test specimen does not significantly d24335 the degree of saturation of the test specimen but rather provides boundary water to eliminate negative pore e2435 associated with sampling and prevents evaporation during the test.
Work Item s – proposed revisions of this standard. Historical Version s – view previous versions of standard. The analysis is based upon the following assumptions:. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
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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. Other loading schedules may be used to model particular field conditions or meet special requirements. Reporting of test results in units other than SI shall not be regarded as nonconformance with this test method.
Alternatively, the requesting agency may specify Test Method B wherein the time-deformation readings are taken on all load increments. For some soils, the rate of consolidation is such that complete consolidation dissipation of excess pore pressure will require more than 24 h.
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Since asym varies with stress level and load increment loading ast, unloadingthe load increments with timed readings must be selected with specific reference to the individual project. Link to Active This link will always route to the current Active version of the standard.
This test method provides the compression curve with explicit data to account for secondary compression, the coefficient of consolidation for saturated materials, and the rate of secondary compression.
Two alternative procedures are provided as follows:. However, the time rate of deformation is very sensitive to degree of saturation and caution must be exercised regarding estimates for duration of settlements when partially saturated conditions prevail.
Note 2—Time-deformation readings are required to determine the time for completion of primary consolidation and for evaluating the coefficient of consolidation, c v. Time-deformation readings are required on a minimum of two load increments.
ASTM D Standard
This implicitly combines two separate systems of units, that is, the absolute system and the gravimetric system. This website is best viewed with browser version of up to Microsoft Internet F2435 8 or Firefox 3. The apparatus in general use for these test methods do not have provisions for verification of saturation.
Click to learn more. Consolidation test results are dependent on the magnitude of the load increments. Note 2—Time-deformation readings are required to determine the time for completion of primary consolidation and for evaluating the coefficient of consolidation.
Adtm selection and preparation of test specimens is required to reduce the potential of disturbance effects. Active view current version of standard. It is necessary to use an interpretation technique which indirectly determines that consolidation is essentially complete. Most intact samples taken from below the astmm table will be saturated. Accept and continue Learn more about the cookies we use and how to change your settings.
The addition of back pressure saturation does not constitute non-conformance to these test methods. 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 Users of this test method are cautioned that compliance with Practice D does not assure reliable testing.
In the absence of specific instructions, Section 11 provides the default load increment and load duration schedule for a standard test. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.
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. 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.
Compressibility, Compression curves, Consolidation, Consolidation coefficient, Consolidation test, Consolidometer, Preconsolidation pressure, Preconsolidation stress, Primary consolidation, Rebound, Secondary compression, Settlement, Swelling: Estimates of this type are of key importance in the design of engineered structures and the evaluation of their performance. Two alternative procedures are provided as follows:.
Alternatively, the requesting agency may specify F2435 Method B wherein the time-deformation readings are taken on all load increments. Two alternative procedures are provided as follows: How one applies the results obtained using this standard is beyond its scope.
Several other evaluation techniques exist and may yield different estimates of the preconsolidation stress.