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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Several other evaluation techniques exist and may yield different estimates of the preconsolidation stress.
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. 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 This implicitly combines two separate systems of units, that is, the absolute system and the gravimetric system.
Evaluation techniques specified in these test methods assume the pore space is fully saturated and are generally applicable to soils naturally sedimented in water. Most intact samples taken from below the water table will be saturated. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.
Reporting of test results in units other than SI shall not be regarded as nonconformance with this test method. 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. Work Item s – proposed revisions of this standard.
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It is scientifically undesirable to combine two separate systems within a single standard. Combining values from the two systems may result in non-conformance with the standard. The analysis is based upon the following assumptions:. Link to Active This link will always route to the current Active version of the standard.
ASTM D Standard
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.
Consolidation test results are dependent on the magnitude of the load increments. 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. Reliable testing depends on many factors, and Practice D provides a means of evaluation some of these factors.
Inundation of the test specimen does not significantly change the degree of saturation of sstm test specimen but rather provides boundary water to eliminate negative pore pressure associated with sampling and prevents evaporation during the test.
The required maximum stress level depends on the purpose of the test and must be agreed on with the requesting agency. 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.
How one applies the results obtained using this standard is beyond its scope. 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.
It is the responsibility of the user of this standard to establish asstm safety and health practices and determine the applicability of regulatory limitations prior to use.
The addition of back pressure saturation does not constitute non-conformance to these test methods. Two alternative procedures are provided as follows: Note 2—Time-deformation readings are required to determine the time for completion of primary consolidation and for evaluating the coefficient of consolidation.
The apparatus in general use does not have provisions for formal verification of pore pressure dissipation. Work Item s – proposed revisions of this standard. 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.
It is necessary to use an interpretation qstm which indirectly determines that consolidation is essentially complete.
Active view current version of standard. Estimates of this type are of key importance in the design of engineered structures and the evaluation of their performance. In the absence of specific instructions, Section 11 provides the default load increment and load duration schedule for a standard test. Tests performed on other soils such as compacted and residual weathered or chemically altered soils may require special evaluation techniques.
Tests performed on other unsaturated materials such as compacted and residual weathered or chemically altered soils may require special evaluation techniques. Equipment is available d24335 perform consolidation tests using back pressure saturation. Other loading schedules may be used to model particular field conditions or meet special requirements. Alternative techniques to estimate d235 preconsolidation stress may be used when agreed to by atm requesting agency and still be in conformance with these test methods.