proprietary cleaners formulated for removal of contaminants from concrete,
or steam cleaning in accordance with the manufacturer's written
instructions. Do not use solvents for removal of oil or grease. All
traces of cleaning agents and contaminants shall be removed from the
surface.
3.3.1.4
Reinforcing Steel
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NOTE: The deterioration point at which reinforcing
steel must be replaced should be made by a
structural engineer and should consider the function
of the reinforcing steel (i.e. temperature vs.
tension). If the referenced specification is not
included in the project specification, applicable
portions should be inserted here.
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Following the concrete removal operation, inspect the condition of all
exposed reinforcing bars designated to remain in place. Remove and replace
bars which are deteriorated at any point where the original cross section
of any bar has been reduced by more than [25][ ] percent or the original
cross section of adjacent bars has been reduced by more than [20][ ]
percent. Splice new replacement steel in accordance with the provisions of
ACI 318/318R. Secure to adjacent bars all reinforcing steel that is free
to vibrate or otherwise move excessively. Concrete reinforcement shall
conform to Section 03201 STEEL BARS AND WELDED WIRE FABRIC FOR CONCRETE
REINFORCEMENT FOR CIVIL WORKS. Where the bond between the concrete and any
reinforcing steel has been destroyed, or where the concrete deterioration
is caused by corrosion of the reinforcing steel, remove the adjacent
concrete to a depth that will permit cleaning of the steel and bonding of
the concrete. Provide a minimum clearance below the steel of 25 mm (1 inch)
1 inch or 6 mm (1/4 inch)1/4 inch plus the maximum size of aggregate in the
repair material, which ever is greater.clearance around the steel, except
where other reinforcing steel makes this impracticable. Use chipping
hammers weighing less than 7 kg (15 pounds)15 pounds, abrasive water
cutting, or high-pressure water for removal of concrete around reinforcing
steel. Remove all corrosion from reinforcing steel by sandblasting.
3.3.1.5
Shallow Repairs
For shallow repairs that do not require reinforcing steel, remove the
existing concrete to a minimum depth of [50] [ ] mm ([2] [ ] inches)[2] [
] inches below the finished surface and to such additional depth where
necessary to expose a surface of sound, unweathered concrete that is
uncontaminated by oils, greases, or deicing salts or solutions. Remove all
loose and deteriorated concrete from the spalled areas indicated.
3.3.2
Cutting
3.3.2.1
General
Use cutting to remove segments of concrete intact or to define the limits
of removal by other methods.
[3.3.2.2
Abrasive-Water-Jet Cutting
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NOTE: EM 1110-2-2002 does not consider
SECTION 03931
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