Versuche zur Querkraftverstärkung mit Carbonbeton/Test results to shear strengthening with carbon reinforced concrete

Abstract

Im Rahmen des Forschungsprojektes C³ – Carbon Concrete Composite wurden Querkraftversuche an Plattenbalken mit zwei unterschiedlichen Geometrien und Carbonbetonverstärkung durchgeführt. Insgesamt wurden fünf Referenz- und 25 verstärkte Bauteile im Vier-Punkt-Biegeversuch getestet. Variiert wurden das Carbongelege selbst, die Verstärkungskonfiguration am Steg, die Lagenanzahl, Anordnung und Ausrichtung des Carbongeleges in der Verstärkungsschicht sowie die Schubschlankheit. Zudem wurde der Einfluss einer Vorschädigung des Grundkörpers vor dem Verstärken betrachtet. Die Carbonbetonverstärkung bewirkte eine Steigerung der Bruchlast um 25 % bis 42 %, was die Eignung dieser Querkraftverstärkungsmethode belegt.

Experimental investigation on shear strengthening with fiber/textile reinforced concrete

“…The use of TRC for shear strengthening applications on RC beams has been widely investigated. [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] The most commonly used materials for the high-performance fabric are carbon, AR-glass, or basalt, most commonly arranged in a side-bonded or U-wrapped configuration. While the maximum utilization of the strengthening solution is reached when the high-performance fabric fails, often the failure of such strengthening solutions is at least partly related to the low tensile properties of the concrete materials, being it the cementitious matrix of TRC (interlaminar shearing), the interface between old and new concrete (debonding) or the substrate concrete (peeling of the concrete cover).…”

“…The use of TRC for shear strengthening applications on RC beams has been widely investigated 10–24 . The most commonly used materials for the high‐performance fabric are carbon, AR‐glass, or basalt, most commonly arranged in a side‐bonded or U‐wrapped configuration.…”

Investigations into the Shear Load-Capacity of Strengthened Reinforced Concrete Structures with Carbon-Reinforced Concrete

“…Strengthening with CRC for concrete structures with shear load deficit is currently limited to the realm of scientific research, as seen in [11][12][13] for static loads and [14][15][16][17][18] for cyclic loads. Within the framework of the national research project C 3 -Carbon Concrete Composite, numerous experimental investigations on the static and cyclic shear capacity of reinforced concrete T-beams with CRC-strengthening layers were conducted in subprojects C 3 -V1.2, C 3 -V2.7, and C 3 -V2.1 [19].…”