Main Soil Type Symbol Subgroup Symbols Classification Group symbols Gravel G Well-graded Poorly-graded Silty Clayey W P M C GW GP GM GC Sand S SW SP SM SC Silt LL 50% L H ML MH Clay CL CH Organic O OL OH Peat Ptĥ Fig: 3. The engineers of ancient and not-so-ancient civilizations learned to create stable structures through their experience of working with the local materials, the. Silt-Clay Materials if (more than 35 of total sample passing No. Usual Types of Significant Constit -uent Materials Stone Fragments Gravel and Sand Fine Sand Silty or Clayey Gravel Sand Silty Soils Clayey General Rating as Subgrade Excellent to Good Fair to Poorģ UNIFIED SOIL CLASSIFICATION SYSTEM (USC)Ĥ Table: Group symbols for soil classification classification system, The AASHTO classification system is used mostly by state and. Fraction passing No.40: Liquid Limit Plasticity Index 6 Max N.P. 200) Silt-Clay Materials (More than 35% passing No. General Classification Granular Materials (35% or less passing No. Plasticity index of A-7-6 subgroup is greater than LL - 30.Presentation on theme: "AASHTO CLASSIFICATION SYSTEM"- Presentation transcript: Group A-1 Includes well-graded mixture of stone fragments or gravel, coarse sand, fine sand, and a nonplastic or feebly plastic soil binder. Plasticity index of A-7-5 subgroup is equal to or less than the LL - 30. DESCRIPTION OF AASHTO SOIL CLASSIFICATION GROUPS Granular Materials Containing 35 percent or less passing the 75-m (No. Usual types of significant constituent materials 200) sieve)Ĭharacteristics of fraction passing 0.425 mm (No. Silt- Clay Materials (>35% passing the 0.075 mm (No. This system classifies both coarse-grained and fine-grained soils using both particles size analysis and plasticity characteristics of soil which makes it a complete classification system. Granular Materials (35% or less passing the 0.075 mm (No. 10 AASHTO Plasticity Chart Range of LL and PI for soils in groups A-2, A-4, A-5, A-6, and A-7. The classification system was first developed by Hogentogler and Terzaghi in 1929, but has been revised several times since.ĪASHTO Soil Classification System (from AASHTO M 145 or ASTM D3282) Note: First group from the left to fit test data is the correct AASHTO classification. The AASHTO Soil Classification System was developed by the American Association of State Highway and Transportation Officials, and is used as a guide for the classification of soils and soil-aggregate mixtures for highway construction purposes.
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