Karl Mayer Technische Textilien is participating in a project, funded by the German Government’s Federal Ministry of Education and Research. The largest building research project currently running in Germany aims to develop a new composite material made from a carbon-fibre reinforcing material and high-performance concrete.

Karl Mayer’s contribution to the project is to focus on the production of biaxial textile structures for reinforcing concrete components. These biaxial textiles have a grid-like construction. The load-bearing, carbon-fibre material is arranged at an angle of 0º as warp yarns, and at an angle of 90º as weft yarns.

The structure is fixed by means of knitted stitches. The weft can be inserted in line with the stitches or not in line with the stitches. The two relevant types of machine form the basis of Karl Mayer’s two-part work package.

Carbon fibre-reinforced concrete

Technical textiles have made their mark as reinforcing materials for use in concrete structures. The world’s first bridge made from fibre-reinforced concrete was erected in 2005 in Oschatz. Textiles made from carbon-fibre rovings are particularly suitable for reinforcing concrete, since carbon fibres weighing approximately 1.8 g/cm³ are four times lighter and, with a load-bearing capacity of 3,000 N/mm2, are six times more efficient than conventional steel-reinforced concrete.

This lightweight yet extremely strong material can be shaped into virtually any shape and does not corrode. This means that the reinforcement does not have to be treated to make it corrosion-resistant, which is usually done by applying a covering layer. This is said to enable the thickness of the structural components to be reduced considerably, and consequently reduce the amount of concrete needed, the company reports.

Reducing the consumption of materials also reduces the environmental load, according to the manufacturer. The use of carbon-fibre-reinforced concrete, therefore, can have a significant impact on the consumption of resources and energy and on the CO₂ footprint.

C3-Carbon Concrete Composite Project

In view of these performance features, researchers worldwide are working on using carbon fibres as environmentally friendly reinforcing materials in concrete. The trend is also being supported by the German Government.

To establish Germany as the world’s leading provider of carbon-fibre-reinforced concrete to the construction industry, the Federal Ministry of Education and Research is funding the C3-Carbon Concrete Composite Project to the tune of roughly EUR 45 million via funds made available within the framework of the Zwanzig20 – Partnerschaft für Innovation (Twenty20 – Partnership for Innovation) Project.

The 134 partners in the project will also contribute up to EUR 23 million of their own funds. The project is being led by the Dresden University of Technology and brings together partners from various research establishments, companies and federations. Karl Mayer’s subsidiary, Karl Mayer Technische Textilien, is also taking part.

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