A Guide to Repair Concrete Water Tanks

Over time, the concrete water tanks often develop cracks. Some of the reasons for this are shifting of soil beneath the tank, expansion of the freeze-thaw cycle, and contracting the concrete during severe weather conditions. But regardless of the reasons, these cracks can make the tanks leak. Apart from that, the leakages lead to the development of bacteria inside the cracks while making the water unsafe. Thus, it is important to repair the cracks immediately after these develop. There are several ways to repair concrete water tanks. Using concrete water tank sealant is one of the most effective ways. Other methods include using a patch made of hydraulic cement or using a combination of both liner and cement patch.

  1. Measuring the tank is the first step in repairing the tank. And during the measurement, you should note both the tank depth as well as the circumference of the tank. Then order a tank liner from the manufacturer of the required dimensions. Make it sure that you order a liner that is rated as the food-grade level rubber.
  2. Next, drain out the tank completely and clean the crack out. While doing it, remove all the dirt and debris by using a wire brush. Then remove all the loose concrete with the help of a chisel, which may be located around the crack. Never chisel into the crack as this can rather spread the crack.
  3. Then apply a layer of concrete bonding agent along with the concrete water tank sealant surrounding and inside the crack while ensuring that the inner surface of the crack is completely covered. Wait for a few minutes and let the agent dry to the point where the layer is not anymore wet but remains tacky to the touch.
  4. After that, mix a part of hydraulic cement with three parts of water using the electric drill. The final mixture must have a dirt-like consistency, must be moist, and must stick together while rolled into a ball without leaving the cement residue sticking to your hand. Then use the trowel for pressing the cement into the cracks to fill those. Don’t forget to scrape over the cement surface with the tilted edge of the trowel to make the cracks even with the surrounding concrete. Also, remove the excess cement and let the patch dry for an hour or so. 
  5. Thereafter, coat the complete interior part of the water tank with epoxy that would work as the adhesive for the liner. You can even mix a bit of concrete water tank sealant with epoxy. Then roll the resin onto the concrete with the help of a paint roller.
  6. Next, install a liner in the interior part of the tank beginning from the centre part of the tank. Place the centre part of the liner in the centre part of the tank and then press on the liner. This will ensure that the liner will adhere to the concrete. Then spread the liner up the sides and across the bottom of the tank.


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