Waterproofing of a closed concrete drinking water tank



This is the system for the waterproofing of a closed concrete drinking water tank with a seamless thick elastomeric membrane, liquid applied (cold), able to bridge over fissures and also to resist continuous contact with water. The sistem is valid for a new concrete tank, in order to prevent the occurrence of leaks in the future and also for the refurbishment for an old tank with already some leaks that should be repaired.


Boths systems are liquid applied and once they get cured form a seamless and
continuous coating. IMPERMAX AQUA 2K coating is flexible and elastic with  an outstanding ability to bridge over fissures. However a cementitious-acrylic
coating is just a very slight flexible, but not elastic, it has a the capacity to adapt itself to a small movements of the concrete surface, however it has not the capacity to bridge over medium or large fissures. The result is that normally some leaks appear relatively shortly after the application of an acryliccementitious coating, mainly if it is a new tank that is still setting on the ground.


Epoxy 100 Primer is a two component epoxy resin, that even it has no solvents
it has got very low viscosity. It should be applied over a well dry surface.
Humidity primer is a two component epoxy resin, water based that could be
applied over a surface with small remain of moisture. When it is applied it has
got a milky appearance, once it gets dry, it becomes clear. The curing time
could be accelerated (low temperatures, closed area) with the Accelerator IH.
IMPERMAX AQUA 2K is a two component polyurethane resin, totally free of
solvents, roller applied. It has got quite low thixotropy, so over a vertical surface should be additivated with the Thickening Additive (powder form). It has got a drinking water certificate, following European specifications.


The Impermax Aqua 2K, the Humidity Primer and the Epoxy 100 Primer could
be applied with a roller. The surface must be smooth, dry, free from oils, greases, waxes, silicones…If it is new concrete, it should be well-cured and dry and free from laitance.

0- Repair the cracks, holes, remove part of the surface that is not well adhered..

1- Primer
1.1: If it is new concrete water tank, well-cured and well dry: 1 coat of about 0,3
kg/m2 of Epoxy 100 Primer. 2 component Epoxy resin, 100% solids.

1.2: If it is a water tank filled with water in the past, with remains of moisture
inside the surface: 1 coat of about 0,3 kg/m2 of Humidity Primer, two
component Epoxy resin, water-based. In order to help the resin get cured in a
closed area (and help the water evaporate from the resin) forced ventilation is
advisable. In a closed area Accelerant IH is also advisable.

2- Reinforcement of singular points: cracks, joints, corners…Apply a first thin
coat of Impermax Aqua 2K and reinforce it with the non woven geotextile
GEOMAX. The self adhesive strip Butyl Tex could also be used.

3- Apply one coating of approximate. 1,5 kg/m2 of IMPERMAX AQUA 2K with a roller (2 component elastic PU resin, 100% solids with no solvents). Over the
vertical surface the Thickening Additive must be used to avoid the sagging of
the resin (1-3% of additive in the resin). The vertical surface is coated firstly and afterwards the horizontal surface.


Let the material dry about 10 days before filling the tank with water. Rinse the water tank with water and mild detergent before fill it with drinking water.

President Obama Recognizes Hycrete, Inc.

Hycrete CEO Joins CleanTech Leaders for White House Roundtable on How Clean Technology Can Stimulate Economy.

CARLSTADT, N.J., July 2, 2009 – Hycrete, Inc. CEO David Rosenberg was among eight CEO’s of clean technology focused companies invited to participate in a roundtable hosted by President Barack Obama regarding the economic impact of environmentally friendly technologies. The panel also included members of the President’s staff, including Energy Secretary Steven Chu, EPA Administrator Lisa Jackson, and Chief Technology Officer Annesh Chopra.

The industry leaders opened the discussion with examples of how their firms are contributing to innovation and economic growth in hard economic times. In turn, they offered thoughts on steps the Federal Government can take to help accelerate adoption of new technologies, creation of technology jobs, and establish U.S. leadership in CleanTech. Rosenberg walked the President and his staff through Hycrete’s innovative leadership in building materials and construction.

In his remarks following the White House meeting, Obama called the participating firms “some of the most innovative energy companies in America,” and said their industries represent a “a big piece of America’s economic future.”

“It’s men and women like these who will help lead us out of this recession and into a better future. My job – and our job as a government – is to do whatever we can to unleash the great generative powers of the American economy by encouraging their efforts. And when you hear the innovation that’s taking place … [including] new concrete materials that last longer and are waterproofed from the inside out, and that can mean that bridges and roads and buildings can last 20 or 30 years longer than using conventional concrete … that gets you excited.

Hycrete CEO Rosenberg announced, “I’m thrilled to see the success of our business and our innovations recognized at the highest levels of government and in such a high-profile group of corporate peers. We are proud of our efforts to bring value to the economy – and to help increase federal stimulus impact by reducing building and maintenance costs and accelerating construction schedules for public projects.” Rose Garden press briefing (David Rosenberg stands on the top row on the right in the red tie)