Efficient Ultra-High Performance Concrete with Innovative Trajectory-Oriented "Reinforcement" (2019-04)¶

The use of high-performance and ultra-high-performance concrete has shown promising results in recent years, and the first bridge structures and buildings have been made from these materials. As a rule, steel and microsteel fibers are used to reinforce the tensile zone. However, only in a few cases is a supercritical fiber content sought, since this makes processability more difficult on the one hand and also increases costs accordingly on the other. Carbon short fibers, which are specifically aligned by means of a nozzle technique and can thus increase the tensile strength of the composite material many times over, behave differently. With such a "carbon short fiber reinforced concrete" (CSFRC), the focus is explicitly on the load-bearing behavior typical of supercritical fiber contents. Particularly high-performance components can be produced (usually in a 3D printing process) if the orientation of the carbon fibers embedded in the cement matrix is based on the course of the main tensile stresses.