ASTM D2435 PDF

More D Estimates of this type are of key importance in the design of engineered structures and the evaluation of their performance. Careful selection and preparation of test specimens is required to reduce the potential of disturbance effects. Agencies that meet the criteria of Practice D generally are considered capable of competent and objective testing. Users of this test method are cautioned that compliance with Practice D does not assure reliable testing. Reliable testing depends on many factors, and Practice D provides a means of evaluation some of these factors.

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More D Scope 1. Two alternative procedures are provided as follows: 1. Time-deformation readings are required on a minimum of two load increments. 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 Evaluation techniques specified in this test method are generally applicable to soils naturally sedimented in water.

Tests performed on other soils such as compacted and residual weathered or chemically altered soils may require special evaluation techniques. Note 2—Time-deformation readings are required to determine the time for completion of primary consolidation and for evaluating the coefficient of consolidation. Since c varies with stress level and load increment loading or unloading , the load increments with timed readings must be selected with specific reference to the individual project. Alternatively, the requesting agency may specify Test Method B wherein the time-deformation readings are taken on all load increments.

The values stated in inch-pound units are approximate and given for guidance only. Reporting of test results in units other than SI shall not be regarded as nonconformance with this test method. 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.

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. How one applies the results obtained using this standard is beyond its scope. 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.

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ASTM D2435

Two alternative procedures are provided as follows: 1. Time-deformation readings are required on a minimum of two load increments. This test method provides only the compression curve of the specimen and the results combine both primary consolidation and secondary compression deformations. 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. Evaluation techniques specified in these test methods assume the pore space is fully saturated and are generally applicable to soils naturally sedimented in water.

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ASTM D2435/D2435M

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