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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Reliable testing depends on many factors, and Practice D provides a means of evaluation some of these factors. 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. It is scientifically undesirable to combine two separate systems within a single standard.
ASTM D Standard
In the absence of specific instructions, Section 11 provides the default load increment 2d435 load duration schedule for a standard test.
The test results can be greatly affected by sample disturbance. This test method provides only the compression curve of the specimen and the results combine both primary consolidation and secondary compression deformations.
Traditionally, the axial stress is doubled for each increment resulting in a load increment ratio of 1. Tests performed on other soils such as compacted and residual weathered or chemically altered soils may require special evaluation techniques. Evaluation techniques specified in this test method are generally applicable to soils naturally sedimented in water. Link to Active This link will always route to the current Active version of the standard. Tests performed on other unsaturated materials such as compacted and residual weathered or chemically altered soils may require special evaluation techniques.
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. Users of this test method are cautioned that compliance with Practice D does not assure reliable testing.
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Estimates of this type are of key importance in the design of engineered structures and the evaluation of their performance. Most intact samples taken from below the water table will be saturated. Traditionally, the load duration is the same for each increment and equal to 24 h.
S2435 loading schedules may be used to model particular field conditions or meet special requirements. The apparatus in general use for these test methods do not have provisions for verification of saturation.
It is necessary to use an interpretation technique which indirectly determines that consolidation is essentially complete.
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 used. Work Item s – proposed revisions of this standard. Two alternative procedures are provided as follows: Combining values from the two systems may result in non-conformance s2435 the standard.
Consolidation test results are dependent upon the duration of each load increment. Since c varies with stress level and load increment loading or unloadingthe load increments with timed readings must be selected with specific reference to atm individual project.
This test method has been written using SI units; however, inch-pound conversions are given in the astmm system, where the pound lbf represents a unit of force weight.
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. Alternatively, the test may be performed using an apparatus equipped to saturate the specimen.
However, the time rate of deformation is very sensitive to degree d24435 saturation and caution must be exercised regarding estimates for duration of settlements when partially saturated conditions prevail.
The values stated in each system may not zstm exact equivalents; therefore, each system shall be used independently of the other. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Time-deformation readings are required on a minimum of two load increments. 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 aastm preconsolidation stress and that the specimen is loaded to a sufficiently high stress level.