TM 5-822-5/AFM 88-7, Chap. 1
pavement, or drainage facilities construction.
vail at the proposed site. Table 9-1 presents typical
values of k for various soil types and moisture
conditions. These values should be considered as a
9-4. Determination of Modulus of Subgrade
Reaction. For the design of rigid pavements in
guide only, and their use in lieu of the field plate-
those areas where no previous experience regarding
bearing test, although not recommended, is left to
pavement performance is available, the modulus of
the discretion of the engineer. Where a base course
subgrade reaction k to be used for design purposes
is used under the pavement, the k value on top of
is determined by the field plate-bearing test. This
the base is used to determine the pavement
test procedure and the method for evaluating its
thickness. The plate-bearing test may be run on top
results are given in MIL-STD-621A. Where per-
of the base, or figure 9-1 may be used to determine
formance data from existing rigid pavements are
the modulus of soil reaction on top of the base. It is
available, adequate values for k can usually be de-
good practice to confirm adequacy of the k on top
termined on the basis of consideration of soil type,
of the base from figure 9-1 by running a field plate-
drainage conditions, and frost conditions that pre-
load test.
9-2
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