Laserfiche WebLink
CLASSIFICATION OF SOILS <br /> ASTM DESIGNATION. D2487-83 <br /> (Based on Unified Soil Classification System) <br /> CRITERIA FOR ASSIGNING GROUP SOIL CLASSIFICATION <br /> SYMBOLS AND GROUP NAMES" <br /> MAJOR DIVISIONS GroupTYPICAL NAMES° <br /> Symbols <br /> GW Well graded gravel "gravel-sand mixture <br /> GRAVELS CLEAN GRAVELS <br /> (More than 50% (55%fines)c GP Poorly graded gravel, gravel-sand mixture <br /> of coarse <br /> fraction is larger GRAVELS WITHeFa <br /> COARSE than the No 4 GM Silty gravel, gravel-sand silt mixture <br /> FINES <br /> GRAINED sieve size) <br /> SOILS (�12%f ines)c GC Clayey gravel,EFa gravel-sand-clay mixture <br /> 1 (More than <br /> 50%of material SW Well graded sand,"gravelly sand <br /> is larger than CLEAN SANDS <br /> 1 No 200) SANDS <br /> (55%fines)° SP Poorly graded sand,"gravelly sand <br /> (More than 50% <br /> of coarse fraction <br /> 1 is smaller than SANDS WITH SM Silty sand,F11" sand-silt mixture <br /> the No 4 sieve FINES <br /> size) <br /> (;-.12%fines)° SC Clayey sand,F6 H sand-clay mixture <br /> Lean ctay,'JI Inorganic clay of low-medium <br /> CL plasticity, gravelly clay, sandy clay, silty clay <br />' <br /> SILTS & CLAYS Inorganic Silt I- 'and very fine sand, rock flour, silty <br /> ML or clayey fine sands or clayey silts with <br /> FINE GRAINED (Liquid limit X50) slight plasticity <br /> SOILS Organic OL Organic clay K K of low plasticity <br /> organic silt of low plasticity <br /> (More than 50% <br />' of material is CH Fat clay,''K inorganic clay of high plasticity <br /> smaller than <br /> No 200 sieve SILTS & CLAYS Inorganic <br /> size) MH Elastic sift,''K inorganic sift, micaceous or <br />' (Liquid limit z50) diatomaceous fine sandy of silty soils <br /> Organic OH Organic clay is K of medium to high plasticity <br /> g organic silt U K <br />' Highly Organic Soils PT Peat and other highly organic soils <br />' A Based on the material passsrng the 3 in(75 mm)sieve F If soil contains 215%sand add'with sand 10 group name <br /> B 11 field sample contained cobbles or boulders or both add F If fines classify as CL ML use dual symbol GG GM or SC SM <br /> with cobtes or boulders or both"to group name <br /> G It fines are organic add'with organic fines"to group name <br /> C Gravels wish 5 to 121 fines require dual symbols <br /> GW GM well graded gravel with silt H if soil contains y15%gravel add'with gravel"to group name <br /> GW GC well-graded gravel with clay <br /> GP GM poorly graded gravel with silt 1 If soil contains 15 to 29%plus No 200 add'with sand"or"with <br /> GP GC poorly graded gravel with day gravel'whichever is predominant <br /> D Sands with 5 to 12%fines require dual symbols J It soil contains Z30%plus No 200 predominanity sand add'sandy' <br /> SW SM well-graded sand with silt to group name <br /> SW SC well-graded sand with day <br /> Sp SM poorly graded sand with silt K If soil contains 23090 plus No 200 predominantly gravel add <br /> SP SC poorly graded sand with day 'gravelly"to group name <br /> 1 <br />