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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Alternatively, the test may be performed using an apparatus equipped to saturate the specimen.
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 the preconsolidation stress and that the specimen is loaded to a sufficiently high stress level. Active view current version of standard. It is scientifically undesirable to combine two separate systems within a single standard. 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.
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. 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.
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. This implicitly d24355 two separate systems of units, that is, the absolute system and the gravimetric system.
The analysis is based upon the following assumptions:. Load increment ratios of less than v2435 may be desirable for soils that are highly sensitive or whose response is highly dependent on strain rate. 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.
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.
The addition of back pressure saturation does not constitute non-conformance to these test methods. 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.
Evaluation techniques specified in this test method are generally applicable to soils naturally sedimented in water. Work Item s – proposed revisions of this standard.
ASTM D Standard
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. These test methods use conventional consolidation theory based on Terzaghi’s consolidation equation to compute the coefficient of consolidation, c v. Two alternative procedures are provided as follows: Estimates of this type are of key importance in the design of engineered structures and asmt evaluation of their performance.
Careful selection and preparation of test specimens is required to reduce the potential of disturbance effects. The values stated in inch-pound units are approximate and given for guidance only. This test method provides only the compression curve of the specimen and the results combine both primary consolidation and secondary compression deformations.
Tests performed on other unsaturated materials such as compacted and residual weathered or chemically altered soils may require special evaluation techniques. Two alternative procedures are provided as follows:. For some soils, the rate of consolidation is such that complete consolidation dissipation of excess pore pressure will aztm more than 24 h.
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.
Note 2—Time-deformation readings s2435 required to determine the time for completion of primary consolidation and for evaluating the coefficient of consolidation, c v.
The apparatus in general use does not have provisions for formal verification of pore pressure dissipation. It is necessary to use an interpretation technique which indirectly determines that consolidation is essentially complete. Most intact samples taken from below the water table will be saturated. Consolidation test results are dependent upon the duration of each load increment. Consolidation test results are dependent on the magnitude of the load increments.
Equipment is available to perform consolidation tests using back pressure saturation. For example, it asttm 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. Agencies that meet the criteria of Practice D generally are considered capable of competent and objective testing.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Evaluation techniques specified in these test methods assume the aztm space is fully saturated and are generally applicable to soils naturally sedimented in water. Historical D243 s – view previous versions of standard. 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.
Awtm 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.