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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 Tank Sources of Water Leakage. Construction Joints. Inclined Construction Joint. Horizontal Construction Joint.

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Preventing Water Leakage through Construction Joints in RCC Water Contact Structures

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  1. Preventing Water Leakagethrough Construction Jointsin RCC Water Contact Structures

  2. PREFORMED COMPRESSIBLE WATERSTOPS

  3. Overhead Water TankSources of Water Leakage Construction Joints

  4. Inclined Construction Joint Horizontal Construction Joint Sump Tank, Swimming Pool, Sewage Treatment Plants………..Sources of Water Leakage Construction Joints Construction Joints

  5. Vertical Construction Jointin Final Roof Slabs which cannot be cast in one goWater may Leak through the joint shown by dotted line Construction Joint

  6. Vertical Construction joint in BasementSources of Water Leakage Construction joint

  7. Basement Construction JointsSources of Water LeakageWall Floor Joint and all around columns

  8. Construction Joints are present in….. • Overhead Water Tanks • Swimming Pools • Basements • Underground Reservoirs • Water Treatment Plants • Sewage Treatment Plants

  9. Typical Construction Joint for Basement Vertically Held Vibrator unable to consolidate concrete here hence Construction Joint gap Water enters here

  10. The Nagging Problem • Leakage of water through the improperly executed Construction Joint

  11. Swimming Pool Leakagefrom bottom joint This is a movie file. Please wait a few seconds. It will play automatically.

  12. Basement LeakagePlease observe leakage around column base when ground water table risesThis is a movie file. Please wait a few seconds. It will play automatically.

  13. Stopping Water Leaks • Engineers have tried various methods to solve this problem • - during Concreting • - after Concreting

  14. 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

  15. PVC Waterbar sketch

  16. 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.

  17. PVC Waterbar

  18. 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

  19. 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

  20. After Concreting • Grouting into Construction Joints • Generally unsuccessful • Expensive, tedious, time consuming

  21. The Right Approach SYNKOFLEX Compressible Flexible Waterstop

  22. SYNKOFLEX Compressible Flexible Waterstop

  23. SYNKOFLEX Compressible Waterstop

  24. Waterstop Application

  25. A Simple SolutionThis is a movie file. Please wait a few seconds. It will play automatically.

  26. 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.

  27. Laying Synkoflex cross sectional view

  28. How to use - 1

  29. How to use – 2

  30. How to use - 3

  31. RETAINING WALL FOOTINGS RAFT SLAB Application of SYNKOFLEX Waterstopin Basement Construction Jointsa) Wrap Synkoflex around column base.b) Also stick to wall along the perimeter of basement

  32. WATERSTOP Application of SYNKOFLEX Waterstopin Final Roof JointAfter first phase of concrete pour, stick Synkoflex as shown and then continuewith the second pour to get a 100 percent leak free joint

  33. Vertical joints – Nail the SynkoflexThis is a movie file. Please wait a few seconds. It will play automatically.

  34. Pipe JointsThis is a movie file. Please wait a few seconds. It will play automatically.

  35. Laying Synkoflex in basement jointsThis is a movie file. Please wait a few seconds. It will play automatically.

  36. Synkoflex • Single component, self sealing compound • Packed between two self release wrappers • Bonds to cured concrete • Fuses with fresh concrete during hydration

  37. 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

  38. 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

  39. 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

  40. Effectiveness • In extreme cases, can be used even under standing water

  41. Used since 1968 in • Tunnels • Potable Water reservoirs • Sewage Treatment Plants • Fish Hatcheries • Waste Water Treatment Plants • Swimming Pools • Water Tanks

  42. 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

  43. 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

  44. Where not to use • Expansion joints • Tanks which store petroleum based liquids

  45. Case Study – Reservoirs • 200 reservoirs built by Govt. of Karnataka • No construction joint is leaking

  46. 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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