Page 47 - Research Report 2021 - Institut für Leichtbau und Kunststofftechnik

Pultix

Innovative pultrusion process for the continuous production of

thermoset reinforcing bars with helix profiles

Reinforced concrete as a flexibly adaptable material enables versatile appli- Period
cations in civil engineering. Among many advantages, the necessary encapsu- 01.10.2019 – 31.01.2022
lation due to the susceptibility of steel reinforcement to corrosion leads to a
greater use of concrete than it is necessary for optimal load-bearing behavior. Project management
For the most part, concrete consists of resource-intensively produced cement. Prof. Dr.-Ing. habil. Maik Gude

In contrast, rebars made of fiber composite materials can provide sufficiently
high load-bearing properties without corrosion problems. Contact
Daniel Wohlfahrt

The main objective was the development of an efficient pultrusion process Sirko Geller
for manufacturing thermoset composite rebars with a surface topology. Var-

ious processes have been considered and evaluated and, finally, the novel Funding
primary forming process of helix pultrusion proved to be predestined. For
its implementation, methods for impregnating different fibers with different

matrix systems were elaborated and experimentally tested, followed by fun-
damental studies on the curing behavior of resin systems and the forming

possibilities of pure resin and fiber composite samples at different degrees of
curing and forming temperatures. Based on these results, a combined form-
ing and curing tool for process-integrated realization of the helix-structure Federal Ministry for Economic Affairs

has been developed and successfully launched. Finally, the novel process line and Climate Action (BMWK): Programme

enabling single-stage pultrusion of profiled thermoset composite rebars has “Industrial Collective Research” (IGF)
been tested and validated within processing studies. Funding code: 20853 BR/1
Managed by:
German Federation of Industrial Research
Associations “Otto von Guericke” e. V. (AiF)

Composites United Leichtbau-Forschung
gGmbH (CU-LF)

Comparison of bar cross-sections using microscopy to evaluate the impregnation quality

of different fiber systems with different process parameters.

Complex tool for shaping in the helix pultrusion as a detail of the process chain in a
partial sectional view.

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