Question: ( 1 ) As the chief transportation soils engineer you are asked to characterize the subgrade soil as fill material for constructing a new rigid

(1)

As the chief transportation soils engineer you are asked to characterize the subgrade soil as fill material for constructing a new rigid pavement runway at the Chicago O'Hare Airport. Typical loaddeformation curves are given as obtained from a standard size plate

-

loading test conducted on this silty subgrade. Laboratory testing efforts indicated this soil to have a resilient modulus of

9, 000

psi. Compute the modulus of subgrade reaction, k

-

value, according to the definitions used by

(

)

Corps of Engineers,

(

)

AASHTO, and

(

)

Portland Cement Association. What k

-

value would you recommend for the runway design? Plate Load Tests

-

Chicago O'Hare Airport

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