preventing water leakage through construction joints in rcc water contact structures
DESCRIPTION
Preventing Water Leakage through Construction Joints in RCC Water Contact Structures. PREFORMED COMPRESSIBLE WATERSTOPS. Overhead Water Tank Sources of Water Leakage. Construction Joints. Inclined Construction Joint. Horizontal Construction Joint. - PowerPoint PPT PresentationTRANSCRIPT
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Preventing Water Leakage
through Construction Joints
in RCC Water Contact Structures
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PREFORMED COMPRESSIBLE WATERSTOPS
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Overhead Water TankSources of Water Leakage
Construction Joints
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Sump Tank, Swimming Pool, Sewage Treatment Plants………..
Sources of Water Leakage
Horizontal Construction Joint
Inclined Construction Joint
Construction Joints
Construction Joints
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Vertical Construction Jointin Final Roof Slabs which cannot be cast in one go
Water may Leak through the joint shown by dotted line
Construction Joint
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Vertical Construction joint in BasementSources of Water Leakage
Construction joint
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Basement Construction Joints
Sources of Water Leakage
Wall Floor Joint and all around columns
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Construction Joints are present in…..
Overhead Water Tanks Swimming Pools Basements Underground Reservoirs Water Treatment Plants Sewage Treatment Plants
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Vertically Held Vibrator unable to consolidate concrete here hence
Construction Joint gap
Water enters here
Typical Construction Joint for Basement
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The Nagging Problem
Leakage of water through the improperly executed Construction Joint
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Swimming Pool Leakagefrom bottom joint This is a movie file. Please wait a few seconds. It will play automatically.
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Basement LeakagePlease observe leakage around column base when ground water table rises
This is a movie file. Please wait a few seconds. It will play automatically.
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Stopping Water Leaks
Engineers have tried various methods to solve this problem
- during Concreting - after Concreting
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Painting with Epoxy
Painting with epoxy bonding agent
Question: How can a gap get filled with a coat of epoxy ?
Debonding is not the problem, existence of a gap is the problem
Hence Unsuccessful method
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PVC Waterbar sketch
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The next slide is a 20 second movie slide. Kindly wait a few seconds for it to start playing.
Please go to the next slide only after concrete pours onto the PVC water bar.
It shows problems that a PVC waterbar can create and after that, contrasts it with a preformed waterstop.
Thank you.
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PVC Waterbar
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PVC Waterbar Problems 1
Half of it has to be inserted during concreting
Generally difficult to insert due to obstruction by rebar
Folds over during next lift of concreting and forms a tunnel in which water can leak
Never bonds with concrete
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PVC Waterbar Problems 2
End to end should be spliced with PVC Welding equipment which is generally not available at site
Different sizes of strips have to be maintained to resist different heads of water. Chances of mix-up are very high
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After Concreting
Grouting into Construction Joints
Generally unsuccessful
Expensive, tedious, time consuming
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The Right Approach
SYNKOFLEX Compressible
Flexible
Waterstop
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SYNKOFLEX Compressible Flexible Waterstop
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SYNKOFLEX Compressible Waterstop
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Waterstop Application
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A Simple SolutionThis is a movie file. Please wait a few seconds. It will play automatically.
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The next slide is a 15 second movie slide. Kindly wait a few seconds for it to start playing.
Please note how concrete flows all around the Synkoflex and seals the joint with Synkoflex acting like a gasket. Such a compressed seal will never
fail.
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Laying Synkoflex cross sectional view
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How to use - 1
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How to use – 2
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How to use - 3
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Application of SYNKOFLEX Waterstopin Basement Construction Joints
a) Wrap Synkoflex around column base.b) Also stick to wall along the perimeter of basement
FOOTINGS RAFT SLABRETAINING WALL
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Application of SYNKOFLEX Waterstopin Final Roof Joint
After first phase of concrete pour, stick Synkoflex as shown and then continue with the second pour to get a 100 percent leak free
joint
WATERSTOP
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Vertical joints – Nail the SynkoflexThis is a movie file. Please wait a few seconds. It will play automatically.
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Pipe JointsThis is a movie file. Please wait a few seconds. It will play automatically.
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Laying Synkoflex in basement joints
This is a movie file. Please wait a few seconds. It will play automatically.
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Synkoflex
Single component, self sealing compound
Packed between two self release wrappers
Bonds to cured concrete
Fuses with fresh concrete during hydration
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Properties of Synkoflex - 1
Environmentally Safe
Can be used for drinking water tanks
Does not depend on chemical action, swelling, oxidizing for its action
Flexibility of Synkoflex is forever
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Properties of Synkoflex - 2
Never shrinks, cracks or dries out
Inert to acids, alkalies and sewage
Can be stored indefinitely
Can be laid using unskilled labour
Need not be laid when concrete is green
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Effectiveness
Designed to resist water head of 20 mtrs (65 feet) of water when placed in properly designed and compacted M 20 grade concrete
Tests have confirmed that Synkoflex is effective upto 32 mtrs (105 ft)
TRFI test confirms unequivocally for 20 mtrs water head
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Effectiveness
In extreme cases, can be used even under standing water
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Used since 1968 in
Tunnels Potable Water reservoirs Sewage Treatment Plants Fish Hatcheries Waste Water Treatment Plants Swimming Pools Water Tanks
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Where else to use
Joint between Old roof and new roof Joint between Column and Floor when new
floor is being cast Basement Floor (Raft Slab) Horizontal Joint Basement Wall Vertical Joint
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Where else to use
Topmost roof cast in two pours
Any joint between Old Concrete and new concrete provided thickness of concrete member is more than 150 mm
Pipe intrusions in Basement Retaining Walls
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Where not to use
Expansion joints
Tanks which store petroleum based liquids
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Case Study – Reservoirs
200 reservoirs built by Govt. of Karnataka
No construction joint is leaking
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Case Study – Old,New RCC
Landmark building in Karnataka
Was required to abut new roof to old roof
About 150 mtrs of Synkoflex used
No leakage anywhere
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Case Study – Swimming Pool
Swimming Pool built on fifth floor roof by leading developer in Bangalore
No leakage through construction joint
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Case Study - Basement
Leading Jeweller in Chennai
Double basement
Synkoflex used in joints
Basement is bone dry
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Synkoflex Packing
Cross section 20 mm x 20 mm
1 mtr strips x 25 nos per box
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The Low Cost of Success
For a Water treatment plant measuring 8 mtr x 32 mtr x ht 6 mtr volume about 1.5 million ltrs of water
Joint length assumed as about 200 mtrs depending on concreting scheme
Cost of water tight joints is about Rs. 70,000 which is a negligible cost of the total project cost (Rs. 50 lakhs) 1.4 %
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TESTS
Successfully tested by CFTRI, Mysore for potable water safety
Successfully tested by TRFI for resisting water head of 20 mtrs
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Conclusion
Compressible Waterstop enables a 100 percent watertight seal
SYNKOFLEX Waterstop is a permanent solution to stop leakage through construction joints
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THANK YOU