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Classification <br />on basis of <br />percentage of <br />fines by dry wt. <br />Well-graded <br />gravels and <br />gravel-sand mixtures, <br />GRAVELS Clean little or no fines < 5% passing <br />Gravels Poorly-graded #200 sieve = <br />50% or gravels and GW, GP, <br />COARSE-more gravel-sand mixtures,SW, SP <br />of coarse little or no fines <br />fraction Silty gravels, <br />retained gravel-sand-silt > 12% passing <br />SOILS on #4 Gravels mixtures #200 sieve = <br />sieve w/fines Clayey gravels and GM, GC, <br />gravel-sand-clay SM, SC <br />mixtures <br />More than Well-graded sands <br />50% retained and gravelly sands,5% to 12% <br />on No. 200 SANDS Clean little or no fines passing <br />sieve Sands Poorly-graded sands #200 sieve = <br />More than and gravelly sands,Borderline <br />50%little or no fines Classifications <br />of coarse Silty sands and requiring use of <br />fraction sand-silt dual symbols <br />passes Sands mixtures <br />#4 sieve w/fines Clayey sands and <br />sand-clay <br />mixtures <br />Inorganic silts, <br />very fine sands, <br />rock flour, silty <br />or clayey fine sands <br />Inorganic clays of <br />low to medium <br />plasticity, gravelly <br />FINE-clays, sandy clays <br />silty clays, lean clays <br />Organic silts and <br />organic silty clays <br />SOILS of low plasticity <br />Inorganic silts, <br />micaceous or <br />diatomaceous fine <br />50% or more sands or silts, <br />passes elastic silts <br />No. 200 Inorganic clays of <br />sieve high plasticity <br />Fat clays <br />Organic clays of <br />medium to high <br />plasticity <br />Peat, Muck <br />and other highly <br />organic soils <br />than <br />50% <br />HIGHLY <br />ORGANIC <br />SOILS <br />ML <br />CL <br />UNIFIED SOIL CLASSIFICATION SYSTEM <br />SILTS <br />& <br />CLAYS <br />SILTS <br />& <br />CLAYS <br />Liquid <br />Limit <br />GM <br />CH <br />OH <br />SW <br />SP <br />Atterberg limits plot below <br />"A" line and placticity index <br />less than 4 <br />Atterberg limits plot above <br />"A" line and plasticity index <br />greather than 7 <br />Atterberg limits plot below <br />"A" line and placticity index <br />less than 4 <br />Atterberg limits plot above <br />"A" line and plasticity index <br />greather than 7 <br />GRAINED <br />GC <br /> Not meeting both criteria for GW <br /> Not meeting both criteria for SW <br />Atterberg limits plotting in hatched <br />area are borderline classificaiton <br />requireing use of dual symbols <br />SM <br />Plasticity Chart <br />Major Divisions Group <br />Symbol Typical Names Laboratory Classification Criteria <br />Atterberg limits plotting in hatched <br />area are borderline classification <br />requiring use of dual symbols <br />GP <br />GW <br />PT <br />GRAINED <br />SC <br />OL <br />MH <br />Limit <br />50% <br />or less <br />Liquid <br />greater <br />𝐢𝑑=𝐢60 <br />𝐢10 <br />πΊπ‘Ÿπ‘Žπ‘Žπ‘‘β„Žπ‘Žπ‘Ÿπ‘‡β„Žπ‘Žπ‘›6;π‘Žπ‘›π‘ŽπΆπ‘Ž=𝐢30 2 <br />𝐢10 𝑀𝐢60 <br />π‘Žπ‘Žπ‘‘π‘€π‘Žπ‘Žπ‘›1 π‘Žπ‘›π‘Ž3 <br />𝐢𝑑=𝐢60 <br />𝐢10 <br />πΊπ‘Ÿπ‘Žπ‘Žπ‘‘π‘Žπ‘Ÿπ‘‡β„Žπ‘Žπ‘›4;π‘Žπ‘›π‘ŽπΆπ‘Ž=𝐢30 2 <br />𝐢10 𝑀𝐢60 <br />π‘Žπ‘Žπ‘‘π‘€π‘Žπ‘Žπ‘›1 π‘Žπ‘›π‘Ž3