CO2 Eco-Structure

Developing a new, dream-like construction material

Our goal was to create a material that has all of the advantages of concrete with none of its disadvantages. The next challenge was the reduction of CO2. Using these objectives, we have developed the CO2 Eco-Structure.

Development Concept for the CO2 Eco-Structure

Wet material that is resistant to tensile force

The CO2 Eco-Structure is a non-reinforced material that has the equivalent compressive strength (approximately Fc = 24N/mm2) and comparable tensile strength to reinforced concrete.

No water necessary for construction

Eliminating water minimizes variation in material strength and increases consistency in the field; it also promotes cleanliness at the site.

Fabrication method using instantly solidifying units

Construction time can be greatly reduced with a concrete alternative that solidifies rapidly.

Completing the structure using transparent molds

Unlike concrete molds where the hardening material cannot be inspected, we are able to inspect the material for defects as it is hardening by using transparent molds.

Mixing low-tech with high-tech

Using high-tech technology with low-tech construction methods so that non-specialized people can participate in manufacturing and construction.

Units with limitless shapes

An endless configuration of shapes, from circles to triangles, to other multi-sided structures can be made using the unit system. In addition, the unit system can be utilized for temporary structures, as it can be easily broken down.

Alternative materials for subsidence

Ground recovery and leveling after subsidence caused by major earthquakes.

What is the CO2 Eco-Structure?

The fabrication technology of the CO2 Eco-Structure was derived from sand-mold casting methods from half a century ago. Unlike the sand-mold casting method, which was used temporarily to cast other materials, the CO2 Eco-Structure is designed to last for centuries to come.

Selectively using two types depending on the purpose

CO2 Eco-Structure has two production processes, one yielding Type I, the other yielding Type II. Type I is made by injecting CO2 into the silica sand and only possesses compressive strength. Its purpose is to be used to level areas affected by subsidence.
Type II is made impregnating Type I with an epoxy resin, creating a structure that has equivalent compressive and tensile strength.

CO2 Eco-Structure Type I fabrication process

  1. Fill transparent mold with silica sand
  2. Inject carbon dioxide through holes in the mold
  3. The sand hardens instantly (20 seconds per 100mm3), becoming a self-sustaining structure.
CO2 Eco-Structure Type I fabrication process

A viscoelastic, non-particulate material that does not adhere to the mold is created.

CO2 Eco-Structure Type II fabrication process

  1. Same process as Type I
  2. Soak the solidified block in epoxy resin
  3. Full strength expressed in about one day
CO2 Eco-Structure Type II fabrication process

Please watch the video clips of the CO2 Eco-Structure to help you better understand the fabrication process.

The CO2 Eco-Structure is a new technology and we are developing many other features and uses for it. One of those features is to apply principles of nature to architecture, by creating structures that inhale CO2 and exhale oxygen.
Since the discovery of iron, people have been pushing the limits of architecture, but have also been emitting CO2 in the process. I want to change this behavior as we head toward the 22nd Century. Using silica sand and CO2, materials that can be found almost anywhere, we would like to contribute to the progression of rich local cultures around the world.

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