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(c) Fraunhofer WKI
19.04.2023

Sustainable natural-fiber reinforcement for textile-reinforced concrete components

Textile-reinforced concrete components with a sustainable natural-fiber reinforcement possess sufficient bond and tensile load-bearing behavior for the utilization in construction. This has been verified by researchers at the Fraunhofer WKI in collaboration with Biberach University of Applied Sciences and the industrial partner FABRINO. In the future, textile-reinforced components with natural-fiber reinforcement could therefore replace conventionally reinforced concrete components and improve the environmental balance in the construction industry.

Textile-reinforced concrete components with a sustainable natural-fiber reinforcement possess sufficient bond and tensile load-bearing behavior for the utilization in construction. This has been verified by researchers at the Fraunhofer WKI in collaboration with Biberach University of Applied Sciences and the industrial partner FABRINO. In the future, textile-reinforced components with natural-fiber reinforcement could therefore replace conventionally reinforced concrete components and improve the environmental balance in the construction industry.

Non-metallic reinforcements for concrete elements are currently often made from various synthetically produced fibers - for example from glass or carbon fibers. An ecological alternative to synthetic fibers is provided by flax or other natural fibers. These are widely available and are more sustainable, due, amongst other things, to their renewable raw-material basis, the advantages regarding recycling, and the lower energy requirements during production. This is where the researchers from the Fraunhofer WKI and Biberach University of Applied Sciences, in collaboration with an industrial partner, became active. Their goal was to demonstrate that reinforcements made from textile fibers are just as suitable for utilization in construction as synthetic fibers.

"At the Fraunhofer WKI, we have produced leno fabrics from flax-fiber yarn using a weaving machine. In order to enhance sustainability, we tested a treatment of the flax yarns for improving the tensile strength, durability and adhesion which is ecologically advantageous compared to petro-based treatments," explained Jana Winkelmann, Project Manager at the Fraunhofer WKI. In the coating process, a commonly used petro-based epoxy resin was successfully replaced by a partially bio-based impregnation. A large proportion (56%) of the molecular structure of the utilized epoxy resin consists of hydrocarbons of plant origin and can therefore improve the CO2 balance.

Textile reinforcements have a number of fundamental advantages. They exhibit, for example, significantly reduced corrodibility at the same or higher tensile strength than steel, with the result that the necessary nominal dimension of the concrete covering can be reduced. This often allows smaller cross-sections to be required for the same load-bearing capacity. Up to now, however, the load-bearing behavior of textile reinforcements made from natural fibers in concrete components has not been systematically investigated.

At Biberach University of Applied Sciences, researchers tested the bond and tensile load-bearing behavior as well as the uniaxial flexural load-bearing behavior of concrete components with textile reinforcement made from flax fibers. The scientists came to the conclusion that the natural-fiber-based textile-reinforced components with a bio-based impregnation are fundamentally suitable. The suitability was demonstrated by both a significant increase in the breaking load compared to non-reinforced and under-reinforced concrete components and in finely distributed crack patterns. The curves of the stress-strain diagrams could be divided into three ranges typical for reinforced expansion elements (State I - non-cracked, State IIa - initial cracking, and State IIb - final crack pattern). The delineation of the ranges becomes more pronounced as the degree of reinforcement increases.

As a whole, regionally or Europe-wide available, renewable natural fibers and a partially bio-based coating contribute towards an improvement of the CO2 footprint of the construction industry. As a result, a further opportunity is being opened up for the energy- and raw-material-intensive construction industry in terms of meeting increasingly stringent environmental and sustainability requirements. "Textile-reinforced concretes enable lighter and more slender structures and therefore offer architectural leeway. We would like to continue our research into the numerous application possibilities of natural-fiber-reinforced concretes," said Christina Haxter, a staff member at the Fraunhofer WKI.

The project, which ran from 9th December 2020 to 31st December 2022, was funded by the German Federal Environmental Foundation (DBU).   

26.01.2021

DBU-Funding: From 3D Knitting Machines to Washing without Water

Environmental protection through digitalization - funding for start-ups

Clothing on-demand, a new type of textile cleaning and locally generated green electricity - these three business ideas of “Digitale Strickmanufaktur” (Krefeld), “Infinity Startup” (Aachen) and “prosumergy” (Kassel) convinced the Green Start-up Program’s jury of the German Federal Environmental Foundation (DBU). They will receive a total of around 370,000 euros in technical and financial support.

The DBU promotes company foundations and start-ups that combine solutions for the environment, ecology and sustainability in an innovative way with a focus on digitalization.
General conditions for promotion:

Environmental protection through digitalization - funding for start-ups

Clothing on-demand, a new type of textile cleaning and locally generated green electricity - these three business ideas of “Digitale Strickmanufaktur” (Krefeld), “Infinity Startup” (Aachen) and “prosumergy” (Kassel) convinced the Green Start-up Program’s jury of the German Federal Environmental Foundation (DBU). They will receive a total of around 370,000 euros in technical and financial support.

The DBU promotes company foundations and start-ups that combine solutions for the environment, ecology and sustainability in an innovative way with a focus on digitalization.
General conditions for promotion:

  • in the founding phase as well as start-ups up to 5 years old
  • up to 125,000€ per project
  • up to 24 months duration

A cloud service for retail
The “Digitale Strickmanufaktur” wants to change the clothing industry sustainably. The founders are developing a cloud service that is directly linked to retail. Customers of the " “Digitale Strickmanufaktur” can order individualized garments in which size, color and design are adapted to their wishes. The order data is then transferred using the cloud, an online storage medium. They can be retrieved at any place in the world.

First order - then produce
If a customer orders a hat, for example, the order is automatically transmitted to 3D knitting machines. Then production begins, followed by shipment of the goods. The “Digitale Strickmanufaktur” produces knitwear on demand completely automatically with robots and a 3D knitting machine.

In this way, sales can be planned for retailers and not too much clothing is produced. Additionally: The products are manufactured close to the customer in Germany. Long transport routes and times are eliminated.

Washing without washing machine
The “RefresherBoxx” of the “Infinity Startup” is basically a mobile textile cleaner that does not require water or detergent. “Using a combination of different physical methods, it disinfects, dries and refreshes all kinds of textiles - especially those that can't be put in the washing machine, like leather, velvet and silk,” explains founder Stefan Chang. The “RefresherBoxx” is gentler, more environmentally friendly and only takes 30 minutes for one washing phase. According to Chang, the mobile textile cleaning system can be used in the medical sector, but also in the private and leisure sector.

Local power for commerce and e-mobility
The start-up "prosumergy" offers building owners and tenants a low-cost power supply from renewable energies that are mainly generated locally. "With the help of the DBU, we want to further develop our energy supply approach. By means of standardization and digitization, we want to develop concepts for the decentralized power supply of commercial properties and charging solutions for e-mobility," says founder Lena Cielejewski.

25 founding teams already funded
The three founding teams will now be funded for two years in the DBU's Green Start-up program. "They bring together solutions for the environment, ecology and sustainability with a focus on digitalization in an innovative way," said DBU Start-up coordinator Dr. Stefanie Grade. 22 other companies have already convinced the selection committee of themselves since the program was launched.

Contact details
Digitale Strickmanufaktur PoC GmbH (Krefeld)
Connecting textile trade and automated textile production with the help of cloud services
Contact Mr. Christian Zarbl
URL: digitale-strickmanufaktur.de

Infinity StartUp GmbH (Aachen)
Development, production and distribution of cleaning equipment for textiles, especially using physical methods, as well as development of related applications.
Contact Mr. Stefan Chang
URL: refresherboxx.com

prosumergy GmbH (Kassel)
prosumergy GmbH realizes decentralized energy supply projects as project developer and energy supplier
Contact Christopher Neumann
URL: prosumergy.de