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Posted in Community :

Construction Planning & Management

Asked by : shreedhar , sr.quality control engg, GCC
Industry : Construction
Functional Area : Quality Management
Activity: Question posted: 01 18 2010 10:50:33 +0000, 4 answers, 2463 views, last activity 05 31 2013 09:26:12 +0000
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The water tank is built recently 3 month back.The capacity is 90000 gallans. The seepage is obsreved on the one of the wall very minor. The Redroc Plug from Fosrac Chemicals is used to arrest the same. After 24 hrs it is stoped but leakage is started from another part just 1.2 mtr from the earlier spot. So is there any solution to control such leakages without removing the water?  If so please advise me.



  Answered by     Tennyson Colaco, Proprietor, Hallmark Waterproofing Solutions  | 05 31 2013 09:26:12 +0000
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Most viable way is to seal the crack with a flexible grout. Ideally a hydrophobic polyurethane Injection foaming grout followed by a resin injection would be the best solution and works  well if done while the tank is full as the crack is at its maximum state of expansion. Polyurethane grout will bond very well to the insides of the crack and when fully cured will create a sort of flexible gasket. This repair if done by an experienced person usually lasts a life time.

Renderoc plug is a hydraulic quick setting cement which is okay for temporary repairs and will give away sooner or later.

  Answer modified by     Ragavendran Ramkumar, Civil Engineer-Water/Wastewater, SAI SUDHIR INFRA LTD.  | 12 24 2012 13:52:57 +0000
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The same issue I am tackling right now. Mark the points where water is leaking . Make a hole (by drilling )of 8mm dia. bit to 1/2 the thickness  of concrete . Keep a lesser dia pvc hose to half the depth of drilling and depth and apply quick setting cement on the peripery of hose . Leave it for a day to set. Mix cebex 100 (fosroc) 200gms pack/1 bag cement. Take ordinary cement and mix with water add cebex 100 in the said ratio. mix thoroughly in cement slurry. By using a grouting pump inject the slurry in the points where already hose was kept. The slurry will travel through the area where the concrete is pourous and fill those areas. Once the porous areas are filled the slurry will return back in the pump. Plug the end of the hose so that slurry doesnt come out. Repeat this excercise in places where leakages are existing. This is very effective .Try it out.- Ramkumar, Engineer 

  Answered by     Basab Ghosh, General Manager (Operations), Saipem India Project Ltd.  | 01 19 2010 18:07:47 +0000
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Get a technical person from Fosrock to have a look at the issue. It could be because of not so dense concrete of the wall. Better solution could be to empty the tank and apply a latex based waterproofing membrane on the inside of the tank base and the walls up to a height above the maximum water level. Also seal the joints between the pipes and concrete wall from inside face with a sealant which does not become brittle when set and dry.

  Answered by     Pragya Kothari, Construction-Heavy, DLF  | 01 19 2010 14:06:24 +0000
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I think the problem is with the pipe. It would be better if you get the pipe checked...

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