desired level below the finished concrete surface and to form the groove
for the joint sealant or seals to the size shown. Material used to secure
premolded fillers and wood strips to concrete shall not harm the concrete
and shall be compatible with the joint sealant or seals. The wood strips
shall not be removed until after the concrete curing period. The groove
shall be thoroughly cleaned of all 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.
3.1.1.1
Joints With Field-Molded Sealant
Joints shall not be sealed when the sealant, air or concrete temperature is
less than 4 degrees C 40 degrees F. Immediately prior to installation of
field molded sealants, the joint shall be cleaned of all debris and further
cleaned using water, chemical solvents or other means as recommended by the
sealant manufacturer. The joints shall be dry prior to filling with
sealant. Bond breaker and back-up material shall be installed where
required. Joints shall be primed and filled flush with joint sealant in
accordance with the manufacturer's recommendations.
3.1.1.2
Joints With Preformed Compression Seals
The joint seals shall be installed with equipment which shall be capable of
installing joint seals to the prescribed depth without cutting, nicking,
twisting, or otherwise distorting or damaging the seal and with no more
than five 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, and the seal shall be installed to the depth
indicated with joint installation equipment. Butt joints shall be coated
with liberal applications of lubricant.
3.1.2
Contraction Joints
Joints requiring a bond breaker shall be coated with curing compound or
with bituminous paint. Waterstops shall be protected during application of
bond breaking material to prevent them from being coated.
3.1.3
Waterstops
Waterstops shall be carefully and correctly positioned during installation
to eliminate faulty installation that may result in joint leakage. The
bottom of each waterstop shall be embedded a minimum of 150 mm 6 inches in
firm rock or sealed to other cut-off systems. All waterstops shall be
installed so as to form a continuous watertight diaphragm in each joint.
Adequate provision shall be made to support and protect the waterstops
during the progress of work. Any waterstop punctured or damaged shall be
replaced or repaired at the Contractor's expense. The concrete shall be
thoroughly consolidated in the vicinity of the waterstop.
Suitable guards
shall be provided to protect exposed projecting edges and ends of partially
embedded waterstops from damage when concrete placement has been
discontinued.
3.1.3.1
Splices
Joints in waterstops shall be spliced together by qualified splicers using
the approved splicing procedures to form a continuous watertight diaphragm.
Splices shall be as followed:
a.
Non-Metallic Waterstops - All splices shall be made on a bench in a
SECTION 03151A
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