Unified Soil Classification System classification 2-letter abbreviation used to recognize simple and meaningful in itself, i.e. G = Gravel (gravel), S = Sand (sand), M = Silt (clay, sand), C = Clay (clay), W = Well Graded (MED mix), P = Grade Poorly (tablets not mixed), H = High Liquid Limit (L.L. Exponent), L = Low Liquid Limit (L.L. Low-value) or O = Organic (soil contamination is very อินทรีย compounds), as shown in Figure 1 and table 1.The steps in the resolution may be as follows: 1. broken down by soil grain size characteristics as coarse grains are sand and gravel (Gravel) (Sand) and a pigment, clay (Clay), sand and soil (Silt) 2. broken down by how the distribution of PCs. For coarse grains, as they mixed grain sizes (Well Graded) and granules do not mix because it contains many of the same size or size pigment granules break (Poorly Grade) 3. broken down by Atterberg Limits For them, their Plasticity, called information granules are High and L.L. called high Liquid Limit P.I., etc. At the end, there will be 2 instead of the abbreviation (if equally applied 4 a), such as CH, GW, SP, or GM-GC, ML-CL.Classification by AASHO system Classification Use the abbreviation from A – 1 to A 7-by sorting out its use as a building material is A 1 to 3-A-very reasonable. Section A – 4 7 – A fair access to not available, there are also subdivisions into another group A – 1, A – 2 – 7, 1 as well as A A-a-A-b-1, A 2, A 4-2-7, A-7,-5, etc. – to – as shown in table 2. The steps in the resolution may be as follows: 1. divide according to the distribution of clay tablets. 2. divide by Atterberg Limits 3. divide the Group by Index (G.I.)
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