Design and Testing of Various Ceiling Elements Made of Carbon Reinforced Concrete

Schumann, Alexander; May, Sebastian; Curbach, Manfred

doi:10.3390/icem18-05436

Cited by 9 publications

(7 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…May et al investigated ceiling systems with CFRP bars and textile grids [4]. Schumann et al tested I-beams with Glass-FRP longitudinal bars and carbon textile shear reinforcement [27]. Chudoba et al performed numerical investigations of members containing different textiles [28].…”

Section: Introductionmentioning

confidence: 99%

Structural Behavior of Large-Scale I-Beams with Combined Textile and CFRP Reinforcement

et al. 2020

View full text Add to dashboard Cite

With the innovative composite material carbon-reinforced concrete, thin-walled, high-performance components can be realized. A combination of carbon fiber reinforced polymer (CFRP) bars and non-metallic textile grids is advantageous as it exploits the full potential of the high-performance materials to reduce dead loads, increases durability, and extends lifespan. For new components with such mixed reinforcement, applicable design concepts and engineering rules are necessary to accurately determine the structural and deformation behavior. To validate models and detailing rules previously developed, three large carbon reinforced concrete I-beams were designed and tested to failure with a realistic line load. CFRP bars served as principal bending reinforcement, whereas shear and flange reinforcement consisted of textile grids. Results showed that existing models for bending using variation of strain distribution as well as non-linear finite-element analysis predicted the flexural behavior of structural components with mixed reinforcement in ultimate limit state (ULS) appropriately. Yet, calculation of shear capacity requires further studies to determine textile reinforcement contribution and estimate reduction for concrete strength in reinforced compression struts. For serviceability limit state (SLS), three methods for determination of deflection delivered good results. In future, a rethinking is required with regard to the ductility and robustness of CFRP-reinforced concrete components. In this respect, pronounced cracking as well as the large ultimate strain and deflection compensate for the lacking yield capacity of the reinforcement.

show abstract

Section: Introductionmentioning

confidence: 99%

Structural Behavior of Large-Scale I-Beams with Combined Textile and CFRP Reinforcement

et al. 2020

View full text Add to dashboard Cite

show abstract

“…[9][10][11][12] Among other projects initiated by the public funded C 3 -project (carbon concrete composite), a lot of research and building activity in this field is currently taking place in Germany. [13][14][15][16][17][18] Carbon fibers have great mechanical properties in longitudinal direction but exhibit brittle failure and have low resistance toward bending and mechanical abrasion. Therefore, a ductile matrix is needed, which provides stability to the form and redistributes forces between fibers and protect the fibers from mechanical impact.…”

Section: Cfrp and Cfrp Reinforced Concretementioning

confidence: 99%

“…Design guidelines and codes have already been established 9–12 . Among other projects initiated by the public funded C 3 ‐project (carbon concrete composite), a lot of research and building activity in this field is currently taking place in Germany 13–18 …”

Section: Introductionmentioning

confidence: 99%

New thermoplastic carbon fiber reinforced polymer rebars and stirrups

Apitz¹,

Schmitz²,

Hückler

et al. 2022

Structural Concrete

View full text Add to dashboard Cite

Attributed to its extraordinary strength and durability, the future of reinforcing and prestressing material in reinforced cement concrete (RCC) structures most likely belongs to carbon fiber reinforced polymer (CFRP). However, CFRPs are rarely employed in real structures till now, since the technology to manufacture CFRP rebars and stirrups is still evolving. This is especially applicable for manufacturing of rebars with surface profiles (ribs) and bent sections for stirrups. Unlike thermoset polymers, thermoplastic polymers are highly viscous prior to curing and can be melted and cured again. This creates possibilities for the production technology as well as recyclability. In this paper, new thermoplastic CFRP rebars and stirrups are introduced, which are manufactured in a novel way. The rips are engraved directly after pultrusion and the stirrups are thermoformed out of a straight and already profiled bar. A holistic approach is applied, which enables to evaluate the mechanical overall performance and to compare it with existing products in a reasonable way. This requires the introduction of new parameters, for example the fiber utilization rate. The novel CFRP reinforcement is investigated through tensile tests on bars and stirrups as well as bond tests. The bond performance is quite similar to existing products. Especially while considering how efficient the fibers are utilized in the CFRP bar, the tensile performance and the quality of the stirrups is excellent.

show abstract

“…B. [8–11], aber zum Verbund zwischen Stäben und Beton liegen nur wenige Erkenntnisse vor. Für ein sicheres und wirtschaftliches Entwerfen, Berechnen und Bemessen muss das Verbundtragverhalten jedoch bekannt sein.…”

Section: Introductionunclassified

Carbonstäbe im Bauwesen

Schumann

May

Schladitz

et al. 2020

Beton und Stahlbetonbau

Self Cite

View full text Add to dashboard Cite

Carbonbeton hat sich heutzutage in einigen Bereichen des Bauwesens zu einer Alternative zum Stahlbeton entwickelt. Besonders bei der Verwendung von Carbonmatten liegen für Verstärkung und Neubau bereits umfassende Forschungsergebnisse, unter anderem [2-7], und Praxisprojekte vor. Leider trifft dies in diesem Maße auf Bauteile mit Carbonstabbewehrung nicht zu. Es gibt einige Veröffentlichungen zum Zugtragverhalten oder zu Bauteilen mit Mischbewehrung aus Carbonstäben und-matten, z. B. [8-11], aber zum Verbund zwischen Stäben und Beton liegen nur wenige Erkenntnisse vor. Für ein sicheres und wirtschaftliches Entwerfen, Berechnen und Bemessen muss das Verbundtragverhalten jedoch bekannt sein. Deshalb wird aufbauend auf [11] nun das Verbundverhalten erläutert. Stichworte Carbonbewehrung; nichtmetallische Bewehrung; Carbonbeton; Carbonstäbe; Verbundverhalten Rebars made of carbon fibres for the use in civil engineering: part 2: bond behaviour-bond tests with different carbon rebars Carbon reinforced concrete is becoming more and more accepted in the building industry. The use of mat carbon reinforcement is well researched in regard of the tensile and the bond behaviour. But there is still a considerable need for research in the case of carbon fibre rods and here in particular on the bond behaviour of the rods in concrete. For this reason, 8 various carbon rods with different surface profiles were evaluated in bond tests. The results were compared with the bond behavior of a conventional steel rod. Based on the results, a preferred rod variant was recommended, An in-depth examination of these will be part of a further publication. Keywords carbon fibre reinforcement; non-metallic reinforcement; carbon reinforced concrete; carbon rebars; bond behaviour Bild 1 Abgescherte Oberflächenprofilierung des Carbonstabs nach dem Verbundversuch Destroyed surface of a carbon rebar after pull-out test (Foto: A. Schumann, [1]) Bild 2 Verschiedene Oberflächenprofilierungen für Carbonstäbe Different surface profiles of carbon rebars

show abstract

Design and Testing of Various Ceiling Elements Made of Carbon Reinforced Concrete

Cited by 9 publications

References 8 publications

Structural Behavior of Large-Scale I-Beams with Combined Textile and CFRP Reinforcement

Structural Behavior of Large-Scale I-Beams with Combined Textile and CFRP Reinforcement

New thermoplastic carbon fiber reinforced polymer rebars and stirrups

Carbonstäbe im Bauwesen

Contact Info

Product

Resources

About