31 May 93
5. Recommendations and Requirements
problems. Air-entrained conventional concrete
should also be provided in all regions where the
a. Once strength and serviceability require-
surface of the structure would be exposed to freeze-
ments for the RCC have been established by the
thaw cycles while critically saturated.
structural designers, in accordance with EM 1110-2-
c. When RCC is used for massive concrete
2006, the structural design engineer should work
with material engineers and the material testing
structures, the design objectives of ETL 1110-2-324,
laboratory to establish suitable mix designs, a com-
"Special Design Provisions for Massive Concrete
prehensive laboratory and field testing program, and
Structures" should be considered and a nonlinear
a quality assurance program to assure that the in-
structural analysis performed where required to
place RCC meets the design requirements.
meet design objectives.
b. Hydraulic structures require concrete that is
d. Test placements during the mixture design
durable and watertight, with moderate to high bond
phase and during the initial phase of construction
strength. To assure that the RCC will have these
are needed to verify adequacy of the mixture ingre-
properties, the mix design should have:
(1) Adequate paste and mortar to fill all aggre-
e. Consultation with and approval by
CECW-E is required when selecting consultants
(2) High slump mortar bedding on all lift joint
outside the Corps of Engineers for recommenda-
tions on RCC design and construction practices.
f. The special uplift and sliding stability
(3) Aggregates meeting the standards for
quality and grading as required for conventionally
requirements of Section 9 of the enclosure shall be
followed when designing RCC gravity dams.
g. A Post-Construction Structural Report
Conventional concrete should be provided for
regions where the RCC would be exposed to flow-
should be submitted as outlined in Section 9d of the
ing water with velocities exceeding 25 fps and/or
when flows are of significant duration and
FOR THE DIRECTOR:
PAUL D. BARBER, P.E.
Chief, Engineering Division
Directorate of Civil Works