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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For some soils, the rate of consolidation is such that complete asrm dissipation of excess pore pressure will require more than 24 h. Two alternative procedures are provided as follows:.
Consolidation test results are dependent on the magnitude of the load increments. Traditionally, the axial stress is doubled for each increment resulting in a load increment ratio of 1.
Estimates of this type are of key importance in the design of engineered structures and the evaluation of their performance. The required maximum stress level depends on the purpose e2435 the test and must be agreed on with the requesting agency. The apparatus in general use for these test methods do not have provisions for verification of saturation.
Evaluation techniques specified in these test methods assume the pore space is fully asmt and are generally applicable to soils naturally sedimented in water. Alternatively, the test may be performed using an apparatus equipped to saturate the specimen. 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 Work Item s – proposed revisions of this standard.
Reporting of test results in units other than SI shall not be regarded as nonconformance with this test method. For example, d435 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. The addition of back pressure saturation does not constitute non-conformance to these test methods. 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.
Combining values from the two systems may result in non-conformance with the standard. Two alternative procedures are provided as follows:.
ASTM D Standard
Equipment is available to perform consolidation tests using back pressure saturation. This test method provides only the compression curve of the specimen and the results combine both primary consolidation and secondary compression deformations.
Referenced Documents purchase xstm The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Several other evaluation techniques exist and may yield different estimates of the preconsolidation stress. Time-deformation readings are required on a minimum of two load increments. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Link to Active This link will always route to the current Active version of the standard.
These test methods use conventional consolidation theory based on Terzaghi’s consolidation equation to compute the coefficient of consolidation, c v. Agencies that meet the criteria of Practice D generally are considered capable of competent and objective testing. This implicitly combines two separate systems of units, that is, the absolute system and the gravimetric system.
Reliable testing depends on many factors, and Practice Satm provides a means of evaluation some of these factors. Other loading schedules may be used to model particular field conditions or meet special requirements. 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.
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.
Alternatively, the requesting agency may specify Test Method B wherein the time-deformation readings awtm taken on all load increments.
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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. Traditionally, the load duration is the same for each increment and equal to 24 h.
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 Time-deformation readings are required on a minimum of two load increments.
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. 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.
How one applies the results obtained using this standard is beyond its scope. In particular, the rate of consolidation interpretation of the time curves is only applicable to fully saturated specimens. Note 2—Time-deformation astmm are required to determine the time for completion of primary consolidation and for evaluating the coefficient of consolidation.
It is necessary to use an interpretation technique which indirectly determines that consolidation is essentially complete. 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. Historical Version s – view previous versions of standard. v2435
It is scientifically undesirable to combine two separate systems within a single standard. Tests performed on other soils such as compacted and residual weathered or chemically altered soils may require special evaluation techniques.
Most intact samples taken from below the water table will be saturated.