3.1.1.1
Joint Strips
Strips shall be of the required dimensions and as long as practicable.
After the first floating, the concrete shall be grooved with a tool at the
joint locations. The strips shall be inserted in the groove and depressed
until the top edge of the vertical surface is flush with the surface of the
slab. The slab shall be floated and finished as specified. Working of the
concrete adjacent to the joint shall be the minimum necessary to fill voids
and consolidate the concrete. Where indicated, the top portion of the
strip shall be sawed out after the curing period to form a recess for
sealer. The removable section of PVC or HIPS strips shall be discarded and
the insert left in place. True alignment of the strips shall be maintained
during insertion.
3.1.1.2
Sawed Joints
Joint sawing shall be early enough to prevent uncontrolled cracking in the
slab, but late enough that this can be accomplished without appreciable
spalling. Concrete sawing machines shall be adequate in number and power,
and with sufficient replacement blades to complete the sawing at the
required rate. Joints shall be cut to true alignment and shall be cut in
sequence of concrete placement. Sludge and cutting debris shall be removed.
3.1.2
Expansion Joints
Preformed expansion joint filler shall be used in expansion and isolation
joints in slabs around columns and between slabs on grade and vertical
surfaces where indicated. The filler shall extend the full slab depth,
unless otherwise indicated. The edges of the joint shall be neatly
finished with an edging tool of 3 mm 1/8 inch radius, except where a
resilient floor surface will be applied. Where the joint is to receive a
sealant, the filler strips shall be installed at the proper level below the
finished floor with a slightly tapered, dressed and oiled wood strip
temporarily secured to the top to form a recess to the size shown on the
drawings. The wood strip shall be removed after the concrete has set.
Contractor may opt to use a removable expansion filler cap designed and
fabricated for this purpose in lieu of the wood strip. The groove shall be
thoroughly cleaned of laitance, curing compound, foreign materials,
protrusions of hardened concrete, and any dust which shall be blown out of
the groove with oil-free compressed air.
3.1.3
Joint Sealant
Sawed contraction joints and expansion joints in slabs shall be filled with
joint sealant, unless otherwise shown. Joint surfaces shall be clean, dry,
and free of oil or other foreign material which would adversely affect the
bond between sealant and concrete. Joint sealant shall be applied as
recommended by the manufacturer of the sealant.
3.1.3.1
Joints With Preformed Compression Seals
Compression seals shall be installed with equipment capable of installing
joint seals to the prescribed depth without cutting, nicking, twisting, or
otherwise distorting or damaging the seal or concrete and with no more than
5 percent stretching of the seal. The sides of the joint and, if
necessary, the sides of the compression seal shall be covered with a
coating of lubricant. Butt joints shall be coated with liberal
applications of lubricant.
SECTION 03150A
Page 10
Previous Page
