3.10.3.3
Sandblast Finish
The concrete surface shall be blasted at an approved age with approved wet
sandblasting procedures to obtain a [brush] [light] [medium] [heavy] finish
which will match the descriptive photographs in ACI 303R. The finish shall
be similar to and shall closely match the finish on the approved
preconstruction test panel fabricated by the Contractor.
3.10.3.4
Tooled Finish
The thoroughly cured concrete shall be dressed at an approved age with
approved electric, air, or hand tools to a uniform texture with a
[hand-tooled] [rough] [fine-pointed] [crandalled] [or] [bush-hammered]
surface texture. The finish shall be similar to and shall closely match
the finish on the approved preconstruction test panel fabricated by the
Contractor.
3.11
REPAIRS
3.11.1
Damp-Pack Mortar Repair
Form tie holes requiring repair and other defects whose depth is at least
as great as their surface diameter but not over 100 mm 4 inchesshall be
repaired by the damp-pack mortar method. Form tie holes shall be reamed
and other similar defects shall be cut out to sound concrete. The void
shall then be thoroughly cleaned, thoroughly wetted, brush-coated with a
thin coat of neat cement grout and filled with mortar. Mortar shall be a
stiff mix of 1 part portland cement to 2 parts fine aggregate passing the
1.18 mm No. 16 mesh sieve, and minimum amount of water. Only sufficient
water shall be used to produce a mortar which, when used, will stick
together on being molded into a ball by a slight pressure of the hands and
will not exude water but will leave the hands damp. Mortar shall be mixed
and allowed to stand for 30 to 45 minutes before use with remixing
performed immediately prior to use. Mortar shall be thoroughly tamped in
place in thin layers using a hammer and hardwood block. Holes passing
entirely through walls shall be completely filled from the inside face by
forcing mortar through to the outside face. All holes shall be packed
full. Damp-pack repairs shall be moist cured for at least 48 hours.
3.11.2
Repair of Major Defects
Major defects will be considered to be those more than 12 mm 1/2 inch deep
or, for Class A and B finishes, more than 12 mm 1/2 inch in diameter and,
for Class C and D finishes, more than 50 mm 2 inches in diameter. Also
included are any defects of any kind whose depth is over 100 mm 4 inches or
whose surface diameter is greater than their depth. Major defects shall be
repaired as specified below.
3.11.2.1
Surface Application of Mortar Repair
Defective concrete shall be removed, and removal shall extend into
completely sound concrete. Approved equipment and procedures which will
not cause cracking or microcracking of the sound concrete shall be used.
If reinforcement is encountered, concrete shall be removed so as to expose
the reinforcement for at least 50 mm 2 inches on all sides. All such
defective areas greater than 7800 square mm 12 square inchesshall be
outlined by saw cuts at least 25 mm 1 inch deep. Defective areas less than
7800 square mm 12 square inches shall be outlined by a 25 mm 1 inch deep
cut with a core drill in lieu of sawing. All saw cuts shall be straight
SECTION 03300A
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