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Crystalline Based Tunnel Waterproofing

30th Mar 2021 Concrete Waterproofing by Munish Sharma

When we talk about waterproofing tunnels, we assume that we are going to waterproof a concrete structure that needs long-lasting durability. Whether it is a highway tunnel or a shallow cut-and-cover utility tunnel, they all are difficult to be repaired due to their heavy usage. Tunnels’ designs usually comprise of shotcrete, precast modules, or cast-in-place concrete and so we must find out the best waterproofing solutions for the tunnels keeping these build-modules in our minds. We assume you have enough knowledge about the hazards of improper or less-effective waterproofing. So let us jump straight to the solutions that we can have to waterproof tunnels giving them a boost in their durability.

Waterproofing of tunnels should be done in such a way that ensures an integral waterproofing of the structure, from both the positive and negative sides. So, instead of working on old and time-consuming membrane-sheet systems, we are going to tell you how the crystallization technology penetrates the concrete and makes it water-tight whenever it comes in contact with the water or moisture. The most recommended crystalline technology-based product is Krystol Internal Membrane (KIM), however, that is not the only product as we know ground reality is always different from the lab test reports. Let us dig deeper into this now.

We can use KIM and Waterstop Swelling Waterstop to give a completely watertight solution for tunnels.


First, let us understand why Krystol Internal Membrane (KIM) is best for tunnel waterproofing. Here are a few key points:
KIM has been used successfully in high-risk projects around the world.

  • Resistance to 524 ft. (16 bar) of hydrostatic pressure
  • Cannot be punctured like externally applied membranes because it is added to the concrete mix
  • Permanently self-seals micro-cracks


KIM is an internal crystalline admixture that turns concrete into a waterproof barrier.

  • Added directly to concrete during the batching process for easy and efficient installation or at the site in transit mixer
  • Saves time due to delays towards weather, scheduling a sub-trade, or applying an externally applied product
  • Backfill can be made just after removing the shuttering


KIM eliminates the need for an externally applied membrane.

  • Can contribute to over 20 LEED points
  • Maximizes building footprint and freedom of design
  • The only way to effectively waterproof blind-wall applications

KIM reduces waterproofing costs for concrete projects.

  • Reduces maintenance and repair costs for concrete over its service life
  • Increases revenue with a larger building footprint and reduces costs with a shorter construction schedule
  • Extends the service life of a structure by creating durable and long-lasting concrete


Now let us know a bit about Krytonite Swelling Waterstop

It is a synthetic rubber waterstop that uses swelling pressure to seal concrete construction joints and stop the water.

Krytonite has superior swelling pressure and performance that stops water better than bentonite and competing swelling waterstops.

It is suitable for use with regular groundwater, as well as salt and sulfate contaminated water. Krytonite is extremely durable and will not deteriorate over time.

Please have a look at the attached image to see how it works with tunnel construction.

We at Kryton are with you every step of the way to ensure your project is a complete success. You can contact Kryton India Waterproofing Experts for free advice on best waterproofing practices.


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