Page 307 - Planning and Design of Airports

100–200 100–200 100–200 100–200 50–100 50–100

5–15 5–15 4–8 4–8 3–5 3–5

100–125 100–125 90–105 80–105 90–110 80–105

Fair to poor Practically impervious Poor Fair to poor Practically impervious Practically impervious Fair to poor

Slight to medium Medium Medium to high High High High Very high

Medium to very high Medium to very high Medium to very high Medium to very high Medium Medium Slight

suitable suitable suitable suitable suitable suitable suitable
Not Not Not Not Not Not Not

Fair to good Fair to good Poor Poor Poor to very poor Poor to very poor Not suitable

Silts, sandy silts, gravelly silts, or diatomaceous soils Lean clays, sandy clays, or gravelly clays Organic silts or lean organic clays Micaccous clays or diatomaceous soils Fat clays Fat organic clays Peat, humus and other Characteristics of Soil Related to Airport Pavement Foundations

ML CL OL MH CH OH Pt
compress- ibility LL compress

Low < 50 High ibility LL<50 Peat and other fibrous organic soils

Fine grained soils TABLE 7-3