The success of a RCC dam is often contingent on
the correct selection of lift thickness, which
depends on the mixture proportions and on the
equipment available.
If the lift is too thin, the placement rates will be
small, thereby reducing the advantages of using
RCC.
If the lift is too thick, the compaction will not be
adequate, creating horizontal layers of higher
porosity, thereby compromising the strength and
durability of the structure.
Normally, the thickness of the lifts ranges from
0.15 to 0.90 m; in the U.S. a lift thickness of 0.3
m is often used.