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Penetration Resistance and Soil Properties(Peck, et al) <br /> Sands Clays <br /> Blows per foot(N) Relative Density Blows per foot(N) Consistency <br /> Less than 2 Very Soft <br /> 0-4 Very Loose 2-4 Soft <br /> 4-10 Loose 4-8 Medium <br /> 10-30 Medium 8-15 Stiff <br /> 30-50 Dense 15-30 Very Stiff <br /> Over 50 Very Dense Over 30 Hard <br /> Plasticity Chart <br /> 60 , <br /> For ciassi-'icatton of fine- rained soils Ile <br /> and f ine-grained ract ion of coarse-grained <br /> soils. <br /> H 5fl / <br /> n Equation of "A—line <br /> Horizontal at P1=4 to L L=25.5, <br /> W then P1=0.73 (LL-20), <br /> 0 40 <br /> z Equot on of"U"-hpe 1 <br /> Vertical at LL=16 to PI=7 f <br /> >- then Pi=0.9(LL-8) / <br /> t 30 <br /> i <br /> / <br /> 20 I / IMH oR OH <br /> to <br /> I <br /> 7 --- _M MLoR OL. <br /> 4 - 1 <br /> 00 10 16 20 30 40 50 60 70 80 90 100 Ito <br /> LIQUID LIMIT (LL) <br /> References <br /> American Society for Testing and Materials, 2011. Standard Practice for Classification of Soils for <br /> Engineering Purposes(Unified Soil Classification System). May 1. <br /> Peck, Ralph B., Foundation Engineering, Second Edition,John Wiley&Sons, 1973. <br /> Page 2 of 3 <br />