ASTM D4718 PDF

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.

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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. Comparison of the liquid limit of a sample before and after oven-drying can therefore be used as a qualitative measure of organic matter content of a soil see Practice D Users of this standard are cautioned that compliance with Practice D does not in itself assure reliable results.

Reliable results depend on many factors; Practice D provides a means of evaluating some of those factors. Scope 1. The specimen preparation procedure to be used shall be specified by the requesting authority.

If no specimen preparation procedure is specified, use the wet preparation procedure. The method to be used shall be specified by the requesting authority. If no method is specified, use Method A.

These limits distinguished the boundaries of the several consistency states of plastic soils. Therefore, the relative contribution of this portion of the soil to the properties of the sample as a whole must be considered when using these methods to evaluate the properties of a soil. The values given in parentheses after SI units are provided for information only and are not considered standard.

In this system, the pound lbf represents a unit of force weight , while the unit for mass is slugs. 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.

The SI values given in Fig. In addition, they are representative of the significant digits that generally should be retained. It is beyond the scope of this standard to consider significant digits used in analysis methods for engineering design. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

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Astm d4718

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. Comparison of the liquid limit of a sample before and after oven-drying can therefore be used as a qualitative measure of organic matter content of a soil see Practice D Users of this standard are cautioned that compliance with Practice D does not in itself assure reliable results.

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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.

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