Preventing Water Leakage through Construction Joints in RCC Water Contact Structures
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Transcript of Preventing Water Leakage through Construction Joints in RCC Water Contact Structures
Preventing Water Leakage
through Construction Joints
in RCC Water Contact Structures
PREFORMED COMPRESSIBLE WATERSTOPS
Overhead Water TankSources of Water Leakage
Construction Joints
Sump Tank, Swimming Pool, Sewage Treatment Plants………..
Sources of Water Leakage
Horizontal Construction Joint
Inclined Construction Joint
Construction Joints
Construction Joints
Vertical Construction Jointin Final Roof Slabs which cannot be cast in one goWater may Leak through the joint shown by dotted line
Construction Joint
Vertical Construction joint in BasementSources of Water Leakage
Construction joint
Basement Construction Joints
Sources of Water LeakageWall Floor Joint and all around columns
Construction Joints are present in…..
Overhead Water Tanks Swimming Pools Basements Underground Reservoirs Water Treatment Plants Sewage Treatment Plants
Vertically Held Vibrator unable to consolidate concrete here hence
Construction Joint gap
Water enters here
Typical Construction Joint for Basement
The Nagging Problem
Leakage of water through the improperly executed Construction Joint
Swimming Pool Leakagefrom bottom joint This is a movie file. Please wait a few seconds. It will play automatically.
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.
Stopping Water Leaks Engineers have tried various methods to
solve this problem
- during Concreting - after Concreting
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
PVC Waterbar sketch
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.
PVC Waterbar
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
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
After Concreting Grouting into Construction Joints
Generally unsuccessful
Expensive, tedious, time consuming
The Right Approach
SYNKOFLEX Compressible Flexible Waterstop
SYNKOFLEX Compressible Flexible Waterstop
SYNKOFLEX Compressible Waterstop
Waterstop Application
A Simple SolutionThis is a movie file. Please wait a few seconds. It will play automatically.
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.
Laying Synkoflex cross sectional view
How to use - 1
How to use – 2
How to use - 3
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
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
Vertical joints – Nail the SynkoflexThis is a movie file. Please wait a few seconds. It will play automatically.
Pipe JointsThis is a movie file. Please wait a few seconds. It will play automatically.
Laying Synkoflex in basement joints
This is a movie file. Please wait a few seconds. It will play automatically.
Synkoflex Single component, self sealing compound
Packed between two self release wrappers
Bonds to cured concrete
Fuses with fresh concrete during hydration
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
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
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
Effectiveness
In extreme cases, can be used even under standing water
Used since 1968 in Tunnels Potable Water reservoirs Sewage Treatment Plants Fish Hatcheries Waste Water Treatment Plants Swimming Pools Water Tanks
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
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
Where not to use Expansion joints
Tanks which store petroleum based liquids
Case Study – Reservoirs 200 reservoirs built by Govt. of
Karnataka No construction joint is leaking
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
Case Study – Swimming Pool
Swimming Pool built on fifth floor roof by leading developer in Bangalore
No leakage through construction joint
Case Study - Basement Leading Jeweller in Chennai
Double basement
Synkoflex used in joints
Basement is bone dry
Synkoflex Packing
Cross section 20 mm x 20 mm
1 mtr strips x 25 nos per box
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 %
TESTS Successfully tested by CFTRI, Mysore for
potable water safety
Successfully tested by TRFI for resisting water head of 20 mtrs
Conclusion
Compressible Waterstop enables a 100 percent watertight seal
SYNKOFLEX Waterstop is a permanent solution to stop leakage through construction joints
THANK YOU