12/30/2022 0 Comments Aashto material classification![]() ![]() To compare go through the top to bottom until a line is found matching all of the properties calculated here. Now, just compare the data from the AASHTO table of fine grained. For fine grained soil, only liquid limit and plasticity index is required.Now, after finding all of the mentioned values, compare the data from the AASHTO table of coarse grained. For coarse grained soil, % of soil passing through US sieve # 10, #40 and #200 is also required in addition to liquid limit and plasticity index.If % passing ≤ 35% ➡ coarse grained soil.Distinguishing coarse grained / fine grainedįirst of all, find the percentage of soil passing US # 200 sieve (0.075 mm opening) Step by Step Procedure for AASHTO soil classification system 1. For two soils falling under same group and subgroup, the soil having lower GI value is better highway subgrade material in comparison to that of soil having lower GI value. Group index is a number used to refer the quality of soil used as subgrade material in highway. In AASHTO soil classification system, Group index is also included along with soil groups and subgroups.There are 7 major groups present in AASHTO soil classification system which are further divided into subgroups. In AASHTO soil classification system, soils are classified in group and subgroups.AASHTO soil classification system is mainly based on sieve analysis and consistency limits.The AASHTO soil classification system is generally used for soil classification for highway construction projects and is very much used worldwide.The AASHTO soil classification system was initiated by Highway Research Board in 1943. The AASHTO soil classification system was first developed by Terzaghi and Hogentogler in 1929 and has been revised many times.AASHTO soil classification system is given by the American Association of State Highway and Transportation officials.AASHTO soil classification system is one of them. There are so many popular system of soil classification system.Soil classification is generally done to organize the different types of soil in different groups on the basis of their engineering properties. ![]()
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