![]() Classifying only the fraction of the soil passing the 75-mm (3-in.) sieve during laboratory testing, according to ASTM D3282-15, the seven groups of soils for highway construction purposes are: A-1 ![]() Through this table, users of the ASTM D3282-15 document, while looking from left to right, can find the correct classification of tested soil through the process of elimination.Īssigning a group can be an incredibly useful aid in evaluating the significant properties of soil for highway and airfield purposes. This it bases on the results of laboratory tests it details to determine the particle-size characteristics, liquid limit, and plasticity index of soils.ĪSTM D3282-15 includes classification tables drawn from the American Association of State Highway and Transportation Officials (AASHTO) system, which originated as the Public Roads Classification System when Hogentogler and Terzaghi developed it in 1929. However, during road construction, the ground is not always guaranteed to be viable this is dependent on the soil profile, so there is a need to comprehend the properties of soil at the subgrade level.ĪSTM D3282-15: Standard Practice for Classification of Soils and Soil-Aggregate Mixtures for Highway Construction Purposes classifies soils from any geographic location into groups. ![]() There is no doubt that highways, roads, and airfields are crucial for modern transportation, as they literally lay the ground for extensive movement. ![]()
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