ASTM D4718 PDF

More D The liquid limit, plastic limit, and plasticity index of soils are also used extensively, either individually or together, with other soil properties to correlate with engineering behavior such as compressibility, hydraulic conductivity permeability , compactibility, shrink-swell, and shear strength. See Section 6, Interferences. When subjected to repeated wetting and drying cycles, the liquid limits of these materials tend to increase.

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Want this as a site license? Changes from the previous issue A redline edition is available for this document, with all changes visible. Ask Document Center Inc. Scope 1. The practice also is considered valid when the oversize fraction is that portion retained on some other sieve, but the limiting percentage of oversize particles for which the correction is valid may be lower. For some gradations, this interference may begin to occur at lower percentages of oversize particles, so the limiting percentage must be lower for these materials to avoid inaccuracies in the computed correction.

The person or agency using this practice shall determine whether a lower percentage is to be used. However, the correction may not be of practical significance for soils with only small percentages of oversize particles. The person or agency specifying this practice shall specify a minimum percentage of oversize particles below which the practice need not be applied.

The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. This implicitly combines two separate systems of units; that is, the absolute system and the gravitational system.

It is scientifically undesirable to combine the use of two separate sets of inch-pound units within a single standard. This standard has been written using the gravitational system of units when dealing with the inch-pound system. In this system, the pound lbf represents a unit of force weight. The alternative designation given in brackets is for information only and does not represent a different standard sieve size. In addition, they are representative of the significant digits that generally should be retained.

It is beyond the scope of these test methods to consider significant digits used in analysis methods for engineering design. This document cannot replace education or experience and should be used in conjunction with professional judgment.

Not all aspects of this practice may be applicable in all circumstances. Users of this standard are cautioned that compliance with Practice D does not in itself ensure reliable results. Reliable results depend on many factors; Practice D provides a means of evaluating some of those factors.

Significance and Use 4. If a soil contains cobbles or gravel, or both, test options may be selected which result in particles retained on a specific sieve being discarded for example the 4. The unit weight-water content relations determined by the tests reflect the characteristics of the actual material tested, and not the characteristics of the total soil material from which the test specimen was obtained.

If a soil used in construction contains large particles, and only the finer fraction is used for laboratory tests, some method of correcting the laboratory test results to reflect the characteristics of the total soil is needed. This practice provides a mathematical equation for correcting the unit weight and water content of the finer fraction of a soil, tested to determine the unit weight and water content of the total soil. Calculated values of percent compaction based on this correction practice will vary depending on which unit weight value is used for reference.

Keywords compaction; oversize particles; relative density specific gravity oven dried ; unit weight; water content;; ICS Number Code Foundation construction.

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Astm d4718

More D If a soil contains cobbles or gravel, or both, test options may be selected which result in particles retained on a specific sieve being discarded for example the 4. The unit weight-water content relations determined by the tests reflect the characteristics of the actual material tested, and not the characteristics of the total soil material from which the test specimen was obtained. If a soil used in construction contains large particles, and only the finer fraction is used for laboratory tests, some method of correcting the laboratory test results to reflect the characteristics of the total soil is needed. This practice provides a mathematical equation for correcting the unit weight and water content of the finer fraction of a soil, tested to determine the unit weight and water content of the total soil. Calculated values of percent compaction based on this correction practice will vary depending on which unit weight value is used for reference.

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ASTM D4718

More D The exposure may be continuous or intermittent and may occur over wide temperature ranges. It yields comparative data on which to base judgment as to expected service quality. Scope 1. It is designed for testing: 1 specimens of vulcanized rubber cut from standard sheets see Practice D , 2 specimens cut from fabric coated with vulcanized rubber see Test Methods D , or 3 finished articles of commerce see Practice D This test method is not applicable to the testing of cellular rubbers, porous compositions, and compressed sheet packing, except as described in

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