ASTM D1883 PDF

Product Details 1. While traditionally this method of specimen preparation has been used to avoid the error inherent in testing materials containing large particles in the CBR test apparatus, the modified material may have significantly different strength properties than the original material. However, a large experience database has been developed using this test method for materials for which the gradation has been modified, and satisfactory design methods are in use based on the results of tests using this procedure. Consequently, more trials may be required for these materials to establish a reliable CBR. The dry unit weight is usually given as a percentage of maximum dry unit weight determined by Test Methods D or D

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You are on page 1of 14 Search inside document This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade TBT Committee.

A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the U. Department of Defense. Consequently, more trials may be required for these materials to establish a reliable CBR.

The dry unit weight is usually given as a percentage of maximum dry unit weight determined by Test Methods D or D Current edition approved March 1, Published March Originally approved in Last previous edition approved in as D — DOI: The SI units given in parentheses are mathematical conversions, which are provided for information purposes only and are not considered standard.

Reporting of test results in units other than inch-pound units shall not be regarded as nonconformance with this test method. In this system, the pound lbf represents a unit of force weight , while the unit for mass is slugs. Therefore, the standard unit for mass in this standard is either kilogram kg or gram g , or both. This implicitly combines two separate systems of units; that is, the absolute system and the gravitational system.

Density is mass per unit volume whereas unit weight is force per unit volume. No further reproductions authorized. After the density has been determined, the unit weight is calculated in SI or inch-pound units, or both. It is the responsibility of the user of this standard to establish appro- priate safety and health practices and determine the applica- bility of regulatory limitations prior to use.

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ASTM D1883

CBR Description of Test This test method is used to evaluate the potential strength of subgrade, subbase, and base course material, including recycled materials for use in road and airfield pavements. The CBR value obtained in this test forms an integral part of several flexible pavement design methods. For applications where the effect of compaction water content of CBR is small, such a cohesionless, coarse-grained materials, or where an allowance is made for the effect of differing compaction water contents in the design procedure, the CBR may be determined at the optimum water content of a specified compaction effort. The dry unit weight specified is normally the minimum percent compaction allowed by the using agencies field compaction specification. For applications where the effect of compaction water content on CBR is unknown or where it is desired to account for its effect, the CBR is determined for a range of water content, usually the range of water content permitted for field compaction by using agencies field compaction specification. The criteria for test specimen preparation of self cementing and other materials which gain strength with time must be based on a geotechnical engineering evaluation. As directed by the engineer, self cementing materials shall be properly cured until bearing ratios representing long term service conditions can be measured.

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More D The CBR value obtained in this test forms an integral part of several flexible pavement design methods. As directed by the client, self-cementing materials shall be properly cured until bearing ratios representing long term service conditions can be measured. 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. Scope 1.

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ASTM D1883 - 16

More D Scope 1. While traditionally this method of specimen preparation has been used to avoid the error inherent in testing materials containing large particles in the CBR test apparatus, the modified material may have significantly different strength properties than the original material. However, a large experience database has been developed using this test method for materials for which the gradation has been modified, and satisfactory design methods are in use based on the results of tests using this procedure.

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