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Author Archives: Chris

  1. Horizonal Drilling and Hyperflex Grout

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    To install a pipeline underneath an interstate, a horizontal directional drill was used. However, the drilling discovered that the area consisted of large voids / karst zones. The pipeline itself needs to have a solid foundation to rest on. To fill the voids, polyurethane grout was injected into the problem areas. The grout used was Hyperflex, manufactured by SealGuard, Inc. Hyperflex reacts with the moisture in the ground which creates an expanding foam to provide a solid base for the pipeline. Hyperflex is NSF/ANSI/CAN 61 for contact with potable water. The grouting was done by Sub-Technical, Inc.

    Horizontal Directional Drilling and Void Filling with Polyurethane Grout.

  2. Single Component Polyurethane Grout Injection

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    Smaller water leaks in structures can be sealed by injecting single component polyurethane grout into the leak paths. The grout being used is Hyperflex, manufactured by SealGuard, Inc.  Being a single component grout, Hyperflex is pre catalyzed and only needs 2% moisture to start reacting (foaming).  The expanding foam will fill the voids that is creating the leak.  Once cured, the foam will remain flexible to allow for slight movements within the structure.  The benefit of a single component grout is the slower reaction and lower viscosity.  This allows the material to travel further before the reaction, allowing for better penetration and coverage within the leaking substrate.  Hyperflex is also NSF/ANSI/CAN 61 approved for contact with potable water. This injection was done using a grout pump and mechanical injection packers.  Burlap was placed in a large void before injection to help prevent the grout from washout. Grouting was performed by Sub-Technical, Inc.

  3. SealGuard II Polyurethane Grout Injection to Stop Water

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    The seam on this dam tunnel was actively leaking water.  SealGuard II, a dual component polyurethane grout, was injected into the leak path to seal the water flow.  With just a drill, a dual component caulking gun, and some SealGuard II, a water leak of up to 50 gallons per minute can be stopped.  SealGuard II is manufactured by SealGuard, Inc. and the grouting was performed by Sub-Technical, Inc.

  4. Concrete Floor Seeping Water

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    This new construction concrete floor was leaking ground water at a joint.  Polyurethane grout was pressure injected through mechanical packers to seal off the flow.  The grout was Hyperflex, a single component moisture activated material that is manufactured by SealGuard, Inc.  Hyperflex is pre-catalyzed and in NSF-61 approved for potable water.  The grouting was done by grouting contractor Sub-Technical, Inc.

  5. Water Traveling Along a De-Watering Pipe in a Hard Rock Mine

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    The picture on the left is water traveling down the outside of de-watering pipe in a hard rock mine.  The picture on the right is after the annulus of the pipe was injected with polyurethane grout to control the unwanted groundwater infiltration.  This high-pressure injection of grout was able to stop the water in about fifteen minutes.  The polyurethane grout used was SealGuard II, dual component material that reacts in 1-3 seconds to create a rigid foam.  SealGuard II is manufactured by SealGuard, Inc. and the injection was performed by Sub-Technical, Inc.

  6. Earthen Dam Repair

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    Earthen dams losing water can be injected with polyurethane grout to seal the leak paths.  Here holes were drilled along the crest of the dam which enabled lances to be inserted.  The lances were then hooked up to a pump and injected with Hyperflex.  Hyperflex is a single component polyurethane grout that is moisture activated.  Hyperflex is also NSF/ANSI/CAN 61 approved for contact with potable water.  This method is less invasive and more cost effective than tradition repair methods.  Grouting was performed by grouting contractor Sub-Technical, Inc.

  7. Creek Draining into Abandoned Mine Creating AMD

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    This dry creek bed was created by the water draining into an abandoned mine below.  Not only was this creating a dried-up creek, but the water also leaving the mine at another location was creating acid mine drainage.  To prevent the water from entering the mine, the creek bed was injected with polyurethane grout.  The grout, Hyperflex, sealed off the leak paths and will help keep the water on the surface.  Hyperflex is a single component, moisture activated material that is NSF/ANSI/CAN 61 approved for potable water.  Hyperflex is manufactured by SealGuard, Inc. and was installed by grouting contractor Sub-Technical, Inc.

  8. Detention Pond Riser Leak

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    Stormwater from a parking lot was going through the joints of this detention pond riser. Polyurethane grout was injected to stop the unwanted infiltration. The polyurethane grout that was used was Hyperflex, manufactured by SealGuard, Inc. Hyperflex is a single component, moisture activated grout that is NSF/ANSI/CAN 61 approved for potable water. The grouting was performed by Sub-Technical, Inc. After the grout is cured, the excess and injection packers can be removed and patched over with concrete for aesthetic purposes.

  9. Bridge Rehab with Polyurethane Grout Injection

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    Bridge Rehab

    Although structurally sound, this bridge had some hairline cracks that would continually drop water onto traffic below. By inserting mechanical packers alongside the fractures and injecting polyurethane grout, the seepage was able to be stopped. The polyurethane grout used in this application was Hyperflex, a single component, moisture activated material that is NSF 61 approved for contact with potable water. Hyperflex is manufactured by SealGuard, Inc., and the instillation was performed by grouting contractor Sub-Technical, Inc.