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PVC Waterstops are used for providing water impermeability in
expansion-contraction (structure) joint seen in concrete structures
exposed to high & low water pressure and for preventing vibrations
and deformations that would appear in concrete blocks.Bitumat Waterstops is an internally cast PVC waterstop system manufactured in a range of sizes for use in reinforced concrete structures. It is essential to form a continuous waterstop network at all joints to prevent the ingress of water and it is vital to use factory produced fabrications. Bitumat Waterstops, internal flexible waterstop systems, have been developed for positive embedment in insitu concrete by creating a valve action to seal the water path, suitable for horizontal and vertical applications.
They are:
PVC waterstops are installed prior to the initial concrete pour to
ensure proper positioning. Split formwork is generally required for
slab-to-slab, slab-to-wall joints where ribbed or dumbbell style
waterstops are used. Split forms allow half of the waterstop to be
positioned inside the first pour with the other half projecting into the
second pour.PVC Waterstop is easily butt spliced with a Teflon coated, thermostatically controlled splicing iron. The ends of the waterstop must be cut square to form matching edges. Uniformly melts the ends 380º using the thermostatically controlled splicing iron. It is important to use an indirect source of heat for this procedure. Direct exposure to a flame will change the chemical composition of PVC and result in a weak weld. When an 1/8" diameter melt bead develops on each waterstop end, remove the splicing iron and firmly press the two ends together in proper alignment. Hold until the material has fused and cooled. Allow the splice to cool naturally; do not quench. Melt temperature of the splicing iron must be maintained to avoid burning or charring the material. Heating irons haveresistance type heating elements and experience dimished performance if a reduced voltage is supplied. Avoid operating with long runs of small gauge extension cords.
The Bitumat PVC Waterstop is supported in specially prepared split
stop-end formwork which holds the waterstop in the horizontal plane to
prevent displacement and folding so that half its width will be cast
into the concrete approximately half way through the thickness of the
slab.Care must be taken to ensure that the waterstop is retained 'in the horizontal plane and that adequate compaction of concrete takes place below the web of the waterstop in order to avoid "honeycombing". Lifting the waterstop during compaction to release entrapped air will assist in forming dense compacted concrete. After stripping the formwork supporting the waterstop, the second half can be cast into the adjoining slab with similar precautions taken with regard to "honeycombing".
The waterstop must be supported in split-end form work as described
for slab joints, with great care taken to ensure that the waterstop does
not fold over ufider the weight of the poured concrete. To eliminate
fold-over, the waterstop should be wired to the reinforcing stee! using
the wiring holes provided. A fully continuous waterstop network shall be
formed using factory made junctions with site joints limited to simple
butt welds between similar sections.
Available for Flat Dumbell and Centre Bulb Waterstops. Additional
patterns other than those illustrated are available. Non regular design
requirements of all types can be met by the supply of irregular L and Y
Junction pieces manufactured in the full range of sizes. When ordering
specify all the included angle.Supply for construction/contraction joints Flat Dumbell 170mm wide 15m rolls wt 21.9 kg 210mm wide 15m rolls wt 27.8 kg 250mm wide 15m rolls wt 36.7 kg Supply for expansion/movement joints Centre Bulb 210mm wide 15m rolls wt 26.9 kg 260mm wide 15m rolls wt 38.4 kg Equipment PVC Edge Tie Welding Jigs Unit various sizes Electric (110v or 220v) Unit Welding Knife Mild Steel Welding Knife Unit
Fine tooth saw, wire brush, Stanley knife, 110v or 220v power source, blow lamp if non-electrical mild steel knife is used.
Fused site welded jointing of PVC waterstops can result in the
liberation of hydrochloric acid fumes. In confined spaces forced
ventilation must be provided or a suitable respirator used. On open
sites special precautions are not normally required but operators should
avoid inhaling any fumes. Before using electric welding knife ensure
that it is correctly earthed.
Bitumat PVC waterstops of the size and dimension specified shall be
used to form a continuous network as shown on the detailed drawings and
fixed in position with site jointing limited to butt joints, strictly in
accordance with the manufacturer's instructions.Properties of PVC Compound Tensile strength 13.78 N/mm2 (2000 psi) Elongation at break 300% B.S. Softness 45 Specific Gravity 1.25 - 1.35 Compound Tested in accordance with BS 2571 and US Corps of Engineers CRD-C572-74.
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BITUMAT COMPANY LIMITED offers a complete range of roofing and waterproofing products, which are applicable to all common types of surfaces. BITUMAT membranes, with their supreme performance, are designed to meet the stringent specifications of critical applications. They are tailor made to provide long lasting protection to buildings, roads and bridges. For more information, visit our website http://www.bitumat.com
Wednesday, May 15, 2013
PVC Waterstops
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