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TABLE 18-1-A- SOIL CLASSIFICATION CHART—(Conilnued) <br />CLASSIFICATION CRITERIA <br />Cu = D60(DIO Greater than 4 <br />For clssstfica0on of flne-gralned soils and fine fraction of coors"ralned <br />Cz = DIO X D60 Between 1 and 3 <br />solls <br />Not meeting both Criteria for GW <br />CH <br />Atterberg limits plot below <br />A-Une <br />Atterberg thntts plotting In fuddud area are borderline classifications <br />requiring use of dual symbols. <br />Equation of A41ne: <br />"A" line or plasticity index <br />Atterberg limits plotting <br />less than 4 <br />in hatched area are bor- <br />"A" <br />derline classifications <br />use of dual <br />CLASSIFICATION ON BASIS OF PERCENTAGE OF FINES <br />line and plasticity index <br />symbolsrequirin <br />symbols <br />Leas than 5%, Pass No. 200 (/5 µm) sieve GW, GP, SW, SP <br />greater than 7 — <br />More than 12% Pass N. 200 (75 Pm) sieve GM, GC, SM, SC <br />5% to 12% Pass No. 200 (75 pm) sieve Borderline Classlflcation <br />C. = D60/D10 Greater than 6 <br />requiring use of dual symbols <br />_ <br />� <br />(3 )D <br />_D <br />C D Between 1 and 3 <br />10 60 <br />ML&OL <br />Not meeting both criteria for SW <br />Atterberg limits plot below <br />"A" line or plasticity index <br />Atterberg limits plotting <br />less than 4 <br />in hatched area are bor- <br />Atterberg limits plot above <br />derline classifications <br />requiring use of dual <br />"A" line and plasticity index <br />symbols <br />greater than 7 <br />60 <br />so <br />X 40 <br />v <br />t <br />D 30 <br />v <br />O <br />q <br />Q. <br />20 <br />10 <br />T <br />4 <br />0 <br />0 <br />PLASTICITY CHART <br />For clssstfica0on of flne-gralned soils and fine fraction of coors"ralned <br />solls <br />CH <br />A-Une <br />Atterberg thntts plotting In fuddud area are borderline classifications <br />requiring use of dual symbols. <br />Equation of A41ne: <br />PI = 0: (LL --20) <br />CL <br />MH 4 OH <br />• <br />ML&OL <br />10 20 30 40 5o 60 TO so 90 100 <br />Uquld Limit <br />Visual -Manual Identification <br />3-329 <br />