63 0 10 20 30 40 60 50 0 10 20 30 40 50 60 70 80 90 100 “ A “ line CL Plasticty index Liquid limit CL-ML ML and OL Plasticity Chart OH and MH SC Clayey sands, sandclay mixtures Atterberg limits above “A” line with P.I. greater than 7 7 are bordering cases requiring use of dual symbols Fine-grained soils (more than half material is smaller than No. 200 sieve ) Silts and clays (Liquid limit less than 50) ML Inorganic sits and very fine sand, rock flour, silty or clayey fine sands, or clayey silts with slight plasticity CL Inorganic clays of low or medium plasticity, gravelly clays, silty clays, lean clays OL Organic sits and organic silty clays, silty clays, lean clays Sits and clays (Liquid limit greater thab 50) MH Inorganic silts, micaceous or diatomaceous fine sandy or silty soils, elastic silts CH Inorganic clays of high plasticity, fat clays OH Organic clays of medium to high plasticity, organic silts Highly Organic Soils Pt Peat and other highly organic soils
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