using a thermoplastic splicing iron utilizing a non-stick surface
specifically designed for waterstop welding. The correct temperature shall
be used to sufficiently melt without charring the plastic. The spliced
area, when cooled, shall show no signs of separation, holes, or other
imperfections when bent by hand in as sharp an angle as possible.
3.2.3.3
Edge welding will not be permitted. Centerbulbs shall be compressed or
closed when welding to non-centerbulb type. Waterstop splicing defects
which are unacceptable include, but are not limited to the following: 1)
Tensile strength less than 80 percent of parent section. 2) Free lap
joints. 3) Misalignment of centerbulb, ribs, and end bulbs greater than 2
mm 1/16 inch. 4) Misalignment which reduces waterstop cross section more
than 15 percent. 5) Bond failure at joint deeper than 2 mm 1/16 inch or 15
percent of material thickness. 6) Misalignment of waterstop splice
resulting in misalignment of waterstop in excess of 13 mm in 3 m 1/2 inch
in 10 feet. 7) Visible porosity in the weld area, including pin holes. 8)
Charred or burnt material. 9) Bubbles or inadequate bonding. 10) Visible
signs of splice separation when cooled splice is bent by hand at a sharp
angle.
3.2.4
Non-Metallic Hydrophilic Waterstop Installation
Ends to be joined shall be miter cut with sharp knife or shears. The ends
shall be adhered with cyanacryiate (super glue) adhesive. When joining
hydrophilic type waterstop to PVC waterstop, the hydrophilic waterstop
shall be positioned as shown on the drawings. A liberal amount of a single
component hydrophilic sealant shall be applied to the junction to complete
the transition.
3.2.5
Preformed Plastic Adhesive Installation
The installation of preformed plastic adhesive waterstops shall be a prime,
peel, place and pour procedure. Joint surfaces shall be clean and dry
before priming and just prior to placing the sealing strips. The end of
each strip shall be spliced to the next strip with a 25 mm 1 inch overlap;
the overlap shall be pressed firmly to release trapped air. During damp or
cold conditions the joint surface shall be flashed with a safe, direct
flame to warm and dry the surface adequately; the sealing strips shall be
dipped in warm water to soften the material to achieve maximum bond to the
concrete surface.
3.3
CONSTRUCTION JOINTS
Construction joints are specified in Section 03300A CAST-IN-PLACE
STRUCTURAL CONCRETE except that construction joints coinciding with
expansion and contraction joints shall be treated as expansion or
contraction joints as applicable.
-- End of Section --
SECTION 03150A
Page 12
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