3.1.10.2
Vertical Surfaces
Use rotary equipment consisting of a boom-mounted rotary cutter.
3.2
PROTECTION
3.2.1
Protection of Existing Features
Before beginning any concrete removal work, carefully survey the structure
and examine the drawings and specifications to determine the extent of the
work. Take all necessary precautions to insure against damage to existing
concrete or other structures to remain in place, and repair or replace any
damage to such items as approved by the Contracting Officer at no
additional cost to the Government. Carefully coordinate the work of this
section with all other work, and construct and maintain shoring, bracing
and supports, as required. Insure that structural elements are not
overloaded, and increase structural supports or add new supports as may be
required as a result of any removal work performed under any part of this
contract.
3.2.2
Protection of Personnel
Insure that adequate measures are in place to protect workers, facility
operation personnel and the public from injury due to the operations being
performed. Provide protective measures in accordance with EM 385-1-1.
3.3
REMOVAL OF EXISTING CONCRETE
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NOTE: Depending on the method of concrete removal
and the condition of the existing concrete,
microfracturing may occur beyond the removal limits.
Additional concrete removal by other methods such
as hand-held breakers, bushhammering, or
high-pressure water may be required to remove some
of the microfractured concrete.
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3.3.1
General
Prepare a demolition plan describing the methods and equipment to be used
to remove existing concrete. Remove the existing concrete in the area to
be repaired to the minimum depth indicated 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. The actual
depth of removal shall be subject to approval by the Contracting Officer.
Remove concrete with care to avoid damage to adjacent structures and
concrete that is not to be repaired under this contract and embedded metal
that is not to be removed. Repair any such damage at no additional cost to
the Government. Mark on the surface the limits of concrete removal for
approval by the Contracting Officer prior to any removal. Do not remove
metal and other embedded items exposed during the concrete removal
operations without authorization of the Contracting Officer. Unless
otherwise indicated, continue removal using appropriate equipment to remove
unsound concrete and to eliminate any offsets in the area to be repaired
which would cause an abrupt change in thickness of the repair and to remove
protrusions between holes. Variations in the final prepared surface shall
not exceed the nominal maximum size aggregate of the repair material,
SECTION 03931
Page 49
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