void repaired with replacement concrete. The prepared area shall be
brush-coated with an epoxy resin meeting the requirements of ASTM C 881/C
881M, Type V; a latex bonding agent meeting the requirements of ASTM C 1059,
Type II; or a neat cement grout after dampening the area with water. The
void shall be filled with replacement concrete in accordance with paragraph
MATERIAL AND PROCEDURE FOR REPAIRS.
3.4.2.4
Material and Procedure for Repairs
The cement used in the dry-packed mortar or replacement concrete shall be a
blend of the cement used for production of project concrete and white
portland cement properly proportioned so that the final color of the mortar
or concrete will match adjacent concrete. Trial batches shall be used to
determine the proportions required to match colors. Dry-packed mortar
shall consist of one part cement to two and one-half parts fine aggregate.
The fine aggregate shall be that used for production of project concrete.
The mortar shall be remixed over a period of at least 30 minutes without
addition of water until it obtains the stiffest consistency that will
permit placing. Mortar shall be thoroughly compacted into the prepared
void by tamping, rodding, ramming, etc. and struck off to match adjacent
concrete. Replacement concrete shall be produced using project materials
and shall be proportioned by the Contracting Officer. It shall be
thoroughly compacted into the prepared void by internal vibration, tamping,
rodding, ramming, etc. and shall be struck off and finished to match
adjacent concrete. Forms shall be used to confine the concrete. If an
expanding agent is used in the repair concrete, the repair shall be
thoroughly confined on all sides including the top surface. Metal tools
shall not be used to finish permanently exposed surfaces. The repaired
areas shall be cured for 7 days. The temperature of the in situ concrete,
adjacent air, and replacement mortar or concrete shall be above 5 degrees C
40 degrees F during placement, finishing, and curing. Packaged materials
meeting the requirements of ASTM C 928 may be used in lieu of dry-packed
mortar when approved. Other methods and materials for repair may be used
only when approved in writing. Repairs of the so called "plaster-type"
will not be permitted.
3.4.3
Grout-Cleaned Finish
**************************************************************************
NOTE: See the appropriate design memorandum and EM
1110-2-2000 for surfaces to receive a grout cleaned
finish. Be sure this is shown in the drawings.
**************************************************************************
The surfaces of [_____] shall be given a grout-cleaned finish as
hereinafter described, as approved by the Contracting Officer and after all
required curing, cleaning, and repairs have been completed. Surfaces to be
grout-cleaned shall be moist cured for the required period of time before
application of the grout-cleaned finish. Grout-cleaning shall be delayed
until near the end of construction on all surfaces not to be painted to
achieve uniformity of appearance and reduce the chance of discoloring
caused by subsequent construction operations. The temperature of the air
adjacent to the surface shall be not less than 5 degrees C 40 degrees F for
24 hours prior to and 72 hours following the application of the finish.
The finish for any area shall be completed in the same day, and the limits
of a finished area shall be made at natural breaks in the finished surface.
The surface to receive grout-cleaned finish shall be thoroughly wetted to
prevent absorption of water from the grout but shall have no free water
present. The surface shall then be coated with grout. The grout shall be
SECTION 03700
Page 64
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