ASTM D2435 PDF

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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ASTM D Standard

Link to Active This link will always route to the current Active version of the standard. 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 d22435 evaporation during the test.

Consolidation test results are dependent upon the duration of each load increment. Load increment ratios of less than 1 may be desirable for soils that are highly sensitive or whose response is highly dependent on strain rate.

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Consolidation test results are dependent on the magnitude of the load increments. 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. The compressibility of soil particles and pore water is negligible compared to the compressibility of the soil skeleton. Traditionally, the axial stress is doubled for each increment resulting in a load increment ratio of 1.

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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. This test method provides only the compression curve of the specimen and the results combine both primary consolidation and secondary compression deformations. Alternatively, the requesting agency may specify Test Method B wherein the time-deformation readings are taken on all load increments.

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Combining values from the two systems may result in non-conformance with the standard.

Note 2—Time-deformation readings are required to determine the time for completion of primary consolidation and for evaluating the coefficient of consolidation. In the absence of specific instructions, Section 11 provides the default load increment and load duration schedule for a standard test.

Reporting of test results in units other than SI shall not be regarded as nonconformance with this test method. The apparatus in general use for these test methods do not have provisions for verification of saturation. Evaluation techniques specified in this test method are generally applicable to soils naturally sedimented in water.

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.

ASTM D2435

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 necessary to use sstm interpretation technique which indirectly determines that consolidation is essentially complete.

These test methods use conventional consolidation theory based on Terzaghi’s consolidation equation to compute the coefficient of consolidation, c v.

Equipment is available to perform consolidation tests using back pressure saturation. 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.

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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. Work Item s – proposed revisions of this standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Two alternative procedures are provided as follows: The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.

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 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. 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.

Alternative techniques to estimate the preconsolidation stress may be used when agreed to by the requesting agency and still be in conformance with these test methods. Time-deformation readings are required on a minimum of two load increments. This implicitly combines two separate systems of units, that is, the absolute system and the gravimetric system. It is scientifically undesirable to combine two separate systems within a single standard.

Traditionally, the d243 duration is the same for each increment and equal to 24 h.