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The most environmentally friendly
Swiss concrete and more

With neustark® to the most climate-friendly Swiss concrete

The revolutionary climate-friendly building material is a development of the ETH spin-off neustark. neustark has developed an efficient solution that irreversibly stores carbon dioxide (CO2) from the atmosphere in recycled building materials. The raw material treated in this way can be returned to the cycle and used for the production of climate-friendly structural concretes and RC gravel mixtures. KIBAG markets this sustainable concrete under the KIBECO brand.

Advantages of KIBECO concrete at a glance:

  • For every cubic metre of recycled concrete produced, more than 10 kg of CO2 is stored in the long term and rendered harmless.
  • The CO2 is permanently bound in crystalline form in the concrete and can be recycled or further treated in the next generation without risking CO2 excretion.
  • The building material treated with the neustark process is ready for the market and can be delivered immediately to the construction sites.

KIBECO® for your construction project

The various KIBECO concrete products can be used in a variety of ways:

  1. 1 Exterior wall C301C02
  2. 2 Forecourt RC Gravel Mixture B
  3. 3 Internal wall A101C02
  4. 4 Ceiling B201CO2 & C301CO2
  5. 5 For floor slabs and walls with waterproofing concept B231CO2

KIBECO concrete in circulation

Existing buildings as a supplier of raw materials

The concrete demolition is delivered to our recycling sites.

Preparation of concrete granulate

The concrete demolition is processed into a 0-16 mm concrete granulate.

The Ultimate CO2 Storage

The treatment container of the Neustark plant is filled with concrete granulate and flooded with CO2. The CO2 reacts with the old cement from the concrete granulate and is permanently bound. The concrete granulate is then returned to the cycle.

Sustainable delivery

The refined concrete products are delivered to the construction sites emission-free and CO{sub::2}-neutral with a fully electrified truck mixer.

FAQ

Do you have any questions about KIBECO concrete? Perhaps you will already find the right answer in our FAQ.

What are the properties of KIBECO building materials?

KIBECO building materials (RC concrete and RC gravel mixtures) consist of 100% recycled Swiss aggregates, permanently bound carbon dioxide and cement produced in accordance with SN EN 197-1. The KIBECO building materials treated with the neustark process meet all standard-relevant quality criteria such as compressive strength, modulus of elasticity and durability. In terms of processability and color, KIBECO building materials do not differ from the usual RC building materials. KIBECO building materials store CO2 permanently and sustainably and can also be recycled or further treated in the next generation without risking CO2 elimination.

Why is KIBECO concrete the most climate-friendly Swiss concrete?

The revolutionary, climate-friendly KIBECO concrete is a development of the ETH spin-off neustark. neustark has developed an efficient solution to irreversibly store carbon dioxide (CO2) from the atmosphere in recycled building materials. The raw material treated in this way can be returned to the cycle and used together with sustainable cement (Susteno 4, CEMII/B-LL)  for the production of climate-friendly structural concretes and RC gravel mixtures. KIBAG offers the most sustainable Swiss concrete under the KIBECO brand.

How does the process developed by neustark work?

Concrete granules obtained from the demolition of buildings are treated with carbon dioxide captured from the atmosphere. Through the so-called mineralization, the CO2 is permanently bound in crystalline form. The concrete granulate treated in this way is added to the fresh concrete as a gravel substitute.

How much CO2 can be stored with the neustark process?

With the neustark process, around 10 kg of climate-damaging CO2 per cubic meter of fresh concrete can already be permanently stored. Together with neustark, we are working on increasing this figure tenfold by 2025.

An average single-family house consumes approximately 300 m3 of fresh concrete. If the house is built with a KIBECO building material and delivered with a KIBECO electric mixer truck, 3 tons of CO2 can currently be permanently removed from the atmosphere. This corresponds to a distance of around 15,000 km with a mid-range petrol engine!

By way of comparison, a beech tree has to grow for about 80 years to absorb one tonne of CO2 (source: co2online/carbon-connect). In addition, the trees may be burned at the end of their life and the CO2 bound in the tree over the years will be released again. On the other hand, the mineralization of CO2 in the concrete granulate through the neustark process guarantees permanent CO2 storage.
Where does the used CO2 come from?

In general, the CO2 used industrially in Switzerland comes from abroad. We do it differently. We obtain 100% of our CO2 from the Swiss atmosphere. The CO2 is extracted from the atmosphere by a biogenic process at the WWTP Region Bern in Herrenschwanden. The CO2 is then delivered to our production site in a climate-neutral manner by biogas-powered trucks.

Why can CO2 be stored in concrete granulate?

When a concrete wall is exposed to air, the carbon dioxide [CO2] reacts with the calcium compounds in the cement phases [Ca(OH)2] to form calcite crystals [calcium carbonate, CaCO3]. Thus, CO2 is permanently bound (mineralized) in the crystals. This naturally occurring reaction, also known as "natural mineralization" or "carbonation", is well-known in the construction industry and is accelerated and multiplied in the process developed by neustark.

How is it checked that the CO2 is actually stored in the concrete granulate?

The CO2 uptake of around 10 kg per ton of concrete granulate is measured and documented in the method developed by neustark using both a CO2 flow measurement and a scale, whereby the two independent measurement methods reliably lead to the same measurement result.

Does mineralization increase the risk of corrosion of the reinforcement?

No. The reinforcement rusts in installed concrete because the concrete becomes more acidic during natural mineralization, which reduces the pH value. Carbonation by the neustark process takes place before the granules are mixed with cement and water. The pH value thus remains the same as for non-mineralized concrete.

What is carbonation?

A natural process

The main component of cement is calcium oxide [CaO]. It is extracted from limestone, which essentially consists of calcite crystals [calcium carbonate, CaCO3]. The limestone is fired in the cement plant at around 1,400°C, which releasesCO2 : the calcium oxide [CaO] remains and is further processed into cement products. The cement is then mixed with water, gravel and sand to form concrete.

CaCO3 --> CaO + CO2

Now, when a concrete wall is exposed to air, the carbon dioxide gas [CO2] from the air naturally reacts with the calcium compounds in the cement phase [CaO]. Calcite crystals [calcium carbonate, CaCO3] form in the fine pores and cracks, which can permanently bind CO2 . So the natural reversal of the above reaction occurs.

CaO + CO2 --> CaCO3

However, this is a slow process. During the lifetime of a building, only the few millimeters on the surface of the concrete surfaces are carbonated.

 

PermanentCO2 sequestration

Through the formation of the crystals (mineralization), CO2 is permanently bound. This naturally occurring reaction is known in the construction industry as carbonation and is accelerated and multiplied in concrete granules in the process developed by Neustark.

KIBECO building materials are therefore permanent and sustainable CO 2 storage materials and can also be recycled or further treated in the next generation without risking CO2 elimination.

 

No increased risk of corrosion of the reinforcement

Carbonation by the Neustark process takes place before the concrete granules are mixed with cement and water. The pH value thus remains the same as that of non-mineralized concrete. Thus, the risk of corrosion remains the same as with conventional concrete.

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