damage the environment of the project area.
The method of disposal shall
be subject to approval.
3.1.2.5
Preparation of Previously Placed Concrete
**************************************************************************
NOTE: When the structure has few construction
joints to be bonded, none of them critical, use this
subparagraph and delete requirements of above
subparagraphs and of paragraph Previously Placed
Concrete. Renumber this specification accordingly.
**************************************************************************
Concrete surfaces to which other concrete is to be bonded shall be abraded
in an approved manner that will expose sound aggregate uniformly without
damaging the concrete. Laitance and loose particles shall be removed.
Surfaces shall be thoroughly washed and shall be moist but without free
water when concrete is placed.
3.1.3
Vapor Barrier
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NOTE: When this paragraph is used, coordinate
drawings and specifications ensuring that drawings
indicate vapor barrier beneath slabs. Retain the
penultimate sentence unless experience in the area
has shown it to be unnecessary.
**************************************************************************
Vapor barrier shall be provided beneath the interior on-grade concrete
floor slabs. The greatest widths and lengths practicable shall be used to
eliminate joints wherever possible. Joints shall be lapped a minimum of
300 mm 12 inches. Torn, punctured, or damaged vapor barrier material shall
be removed and new vapor barrier shall be provided prior to placing
concrete. For minor repairs, patches may be made using laps of at least
300 mm 12 inches. Lapped joints shall be sealed and edges patched with
pressure-sensitive adhesive or tape not less than 50 mm 2 inches wide and
compatible with the membrane. Vapor barrier shall be placed directly on
underlying subgrade, base course, or capillary water barrier, unless it
consists of crushed material or large granular material which could
puncture the vapor barrier. In this case, a thin layer of approximately 13
mm 1/2 inch of fine graded material should be rolled or compacted over the
fill before installation of the vapor barrier to reduce the possibility of
puncture. Concrete placement shall be controlled so as to prevent damage
to the vapor barrier.
3.1.4
Perimeter Insulation
**************************************************************************
NOTE: When this paragraph is used, ensure that
drawings indicate location and extent of perimeter
insulation.
**************************************************************************
Perimeter insulation shall be installed at locations indicated. Adhesive
shall be used where insulation is applied to the interior surface of
foundation walls and may be used for exterior application.
SECTION 03300A
Page 34
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