ISSN: 1945-7545
CODEN: GTJODJ
Page Count: 7

The Revised ASTM Standard on the Unified Classification System

Howard, AK
Supervisory civil engineerMember of ASTM, U.S. Bureau of Reclamation, Denver, CO

Abstract

ASTM Test Method for Classification of Soils for Engineering Purposes (D 2487) was significantly revised in 1983. The revisions require that soil is to be classified by using both a symbol and a name, and the group names were standardized. Organic silts and clays were redefined to recognize that organic soils occur that plot above the “A” line on the plasticity chart. More precise guidelines were established, particularly with regard to plasticity, so that only one particular classification will result. If boarderline classifications are used, the classification symbols are separated with a slash with the classification symbol indicated using the standard appearing first. Appendixes give example written descriptions, preparation of soil for testing, and guidelines for using the system for materials such as shale, mudstone, crushed rock, and slag

Keywords:
soil classifications, soils, sands, clays, silts

Paper ID: GTJ10505J
DOI: 10.1520/GTJ10505J
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