3.4.2
Core Holes
Core holes shall not be repaired with shotcrete. Instead, they shall be
filled solid with a dry-pack mixture after being cleaned and thoroughly
dampened.
3.5
FINISHING
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NOTE: See the appropriate DM for type of finish
required. The specified finishes should also be
shown on the contract drawings. Delete the finishes
not required.
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3.5.1
Natural Gun Finish
Unless otherwise specified, undisturbed final layer of shotcrete as applied
from nozzle without hand finishing shall be provided.
3.5.2
Cutting Screed
After the surface has taken its initial set (crumbling slightly when cut),
excess material outside the forms and ground wires shall be sliced off with
a downward cutting motion using a sharp-edged cutting screed.
3.5.3
Flash Coat
A thin coat of shotcrete containing finer sand applied from a distance
greater than normal shall be applied to the surface as soon as possible
after the screeding.
3.5.4
Float and Trowel Finish
Final surface finish shall be provided using [wood float] [rubber float]
[steel trowel]. Troweling of thin sections of shotcrete shall be avoided
unless both troweling and commencement of moisture curing take place within
a relatively short period after placement of shotcrete.
3.5.5
Fiber-Reinforced Shotcrete
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NOTE: Include this paragraph if the exposed steel
fibers pose a safety hazard.
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The Contractor shall finish the outer surface of the structure with a layer
of nonfiber-reinforced shotcrete and provide an appropriate finish as
denoted.
3.6
CURING AND PROTECTION
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NOTE: See appropriate DM for protection durations
and EM 1110-2-2005 on the proper use of accelerating
admixture.
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SECTION 03371
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