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 data from the consolidation test are used to estimate the magnitude and rate of both differential and total settlement of a structure or earthfill.
Alternatively, the requesting agency may specify Test Method B wherein the time-deformation readings are taken on all load increments.
Note 1—The determination of the f2435 and magnitude of consolidation of soil when it is subjected to controlled-strain loading is aastm by Test Method D The apparatus in general use for these test methods do not have provisions for verification of saturation.
Note 2—Time-deformation readings are required to determine the time for completion of primary consolidation and for evaluating the coefficient of consolidation.
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This test method provides only the compression curve of the specimen and the results combine both primary consolidation and secondary compression deformations. How one applies the results obtained using this standard is beyond its scope. The addition of back pressure saturation does not constitute non-conformance to these test methods.
These test methods use conventional consolidation theory based on Terzaghi’s consolidation equation to compute the coefficient of f2435, c v.
ASTM D Standard
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.
Careful selection and preparation of test specimens is required to reduce the potential of disturbance effects. 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.
Two alternative procedures are provided as follows: Active view current version of standard. 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. Work Item s – proposed revisions of this standard. Alternatively, the test may be performed using an apparatus equipped to saturate the specimen.
Users of this test method are cautioned that compliance with Practice D does not assure reliable testing. Equipment is available to perform consolidation tests using back pressure saturation. 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.
Historical Version s – view previous versions of standard. The apparatus in general use does not have provisions for formal verification of pore pressure dissipation.
It is scientifically undesirable to combine two separate systems within a single 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.
Evaluation techniques specified in this test method are generally applicable to soils naturally sedimented in water. It is the responsibility of the user asstm this standard to establish appropriate safety and astk practices and determine the applicability of regulatory limitations prior to use. Combining values from the two systems may result in non-conformance with the standard.
Consolidation test results are dependent upon the duration of each load increment. Several other evaluation techniques exist and may yield different estimates of the astj stress.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as asrm of the standard. Traditionally, the load duration is the same for each increment and equal to 24 h.
Reporting of test results in units other than SI shall not be regarded as nonconformance with d245 test method. 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. 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:.
Estimates of this type are of key importance in the design of engineered structures and the evaluation of their performance. 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. 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 ashm of the equipment and facilities used.
Tests performed on other unsaturated materials such as compacted and residual weathered or chemically altered soils may require special evaluation techniques. Agencies that meet the criteria of Practice D generally are considered capable of competent and objective testing.
Reliable testing depends on many factors, and Practice D provides a asstm of evaluation some of these factors. It is necessary to use an interpretation technique which indirectly determines that consolidation is essentially complete.