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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Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided r2435 part of the standard. Time-deformation readings are required on a minimum of two load increments.

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 necessary to use an interpretation technique which indirectly determines that consolidation is essentially complete. The extent to which partial saturation influences the test results may d24335 a part of the test evaluation and may include application of theoretical models other than conventional consolidation theory.

The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.

Link to Active This link will always route to the current Active version of the standard. The apparatus in general use for these test methods do not have provisions for verification of saturation. Historical Version s – view previous versions of standard.

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.

In particular, the rate of consolidation interpretation of the time curves is only applicable to fully saturated specimens. 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 d24355 evaluate the response.

The compressibility of soil particles and pore water is negligible compared to the compressibility of the soil skeleton. Reporting of test results in units other than SI shall not be regarded as nonconformance with this test method.

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Equipment is available to perform consolidation tests using back pressure saturation. Note 2—Time-deformation readings are required to determine the time for completion of primary consolidation and for evaluating the coefficient of consolidation. The values stated in inch-pound units are approximate and given for guidance only.

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Most intact samples taken from below the water table will be saturated. Two alternative procedures are provided as follows: The required maximum stress level depends on the purpose of the test and must be agreed on with the requesting agency.

ASTM D2435

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 s2435 conditions prevail.

The d22435 of back pressure saturation does not constitute non-conformance to these test methods. 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.

Alternatively, the test may be performed using an apparatus equipped to saturate the specimen. This test method provides only the compression curve of the specimen and the results combine both primary consolidation and secondary compression deformations.

Link to Active This link will always route to the current Active version of the standard. Agencies that meet the criteria of Practice D generally are considered capable of competent and objective testing. Work Item s – proposed revisions of this standard. Two alternative procedures are provided as follows: Tests performed on other unsaturated materials such as compacted and residual weathered or chemically altered soils may require special evaluation techniques.

Since c v varies with stress level and loading type loading or f2435the load increments with timed readings must be selected with specific reference to the individual project. Other loading schedules may be used to model particular field conditions or meet special requirements. 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.

These test d2345 use conventional consolidation theory based on Terzaghi’s consolidation equation to compute the coefficient of consolidation, c v. The interpretation method specified qstm 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 asfm that the specimen is loaded to a sufficiently high stress level.

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Xstm implicitly combines two separate systems of units, that is, the absolute system and the gravimetric system. 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 test method has been zstm using SI units; however, inch-pound conversions are given in the gravimetric system, where the pound lbf represents a unit of force weight.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM D Standard

Time-deformation readings are required on a minimum of two load increments. The analysis is based upon the following assumptions:. Two alternative procedures are provided as follows:. This implicitly combines two separate systems of units, that is, the absolute system and the gravimetric system. Tests performed on other soils such as compacted and residual weathered or chemically altered soils may require special evaluation techniques.

Alternatively, the requesting agency may specify Test Method B wherein the time-deformation readings are taken on all load increments. 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. 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.

Work Item s – proposed revisions of this standard. Estimates of this type are of key importance in the design of engineered structures and the evaluation of their performance. Active view current version of standard. The test results can be greatly astj by sample disturbance.

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. Since c varies with stress level and load increment loading or unloadingthe load increments with timed readings must be selected with specific reference to the individual project.

For some soils, the rate of consolidation is such that complete consolidation dissipation of excess pore pressure will require more than 24 h.