TM 5-818-4/AFM 88-5, Chap. 5
(3) Shear strength testing. When backfill is to be
water content after placement. This situation could re-
placed behind structure walls or bulkheads or as
sult from an increase in the groundwater level after
foundation support for a structure, and when fills are
construction.
to be placed with unrestrained slopes, shear. tests
(c) Density control of placed backfill in the field
should be performed on representative samples of the
can be facilitated by the use of rapid compaction check
backfill materials compacted to expected field densi-
tests (para 7-5c). A direct rapid test is the one-point
ties and water contents to estimate as-constructed
impact compaction test. Rapid indirect tests, such as
shear strengths. The appropriate type of test required
the Proctor needle penetration for cohesive soils or the
for the conditions to be analyzed is presented in TM
cone resistance load for cohesionless soils, can also be
5-818-1/AFM 88-3, Chapter 7. Procedures for shear
used when correlations with CE 55 maximum density
strength testing are described in EM 1110-2-1906.
have been established.
3-3
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