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International Concrete Abstracts Portal

Showing 1-5 of 12 Abstracts search results

Document: 

SP250-03

Date: 

March 1, 2008

Author(s):

W. Brameschuber, M. Koster, J. Hegger, and S. Voss

Publication:

Symposium Papers

Volume:

250

Abstract:

The aim of this research project was to develop a textile-reinforced concrete ceiling board that remains as part of the ceiling after completion. The lost formwork element was designed to carry the load of a 200 mm (7.87 inch) thick layer of fresh concrete. The influence of different reinforcement textiles was examined. The load bearing capacity and the serviceability were investigated by 4-point bending tests. The bond to the top concrete layer was examined by bending tests carried out on composite beams consisting of the formwork element with a top concrete layer. To test the loadbearing capacity when the element is used as part of a one-way spanning slab, composite slabs of three formwork elements with steel-reinforced top concrete were cast and tested. The resistance to fire of the integrated formwork elements was investigated by conducting standardized fire tests. The results from this investigation demonstrate that the developed textile reinforced concrete formwork element successfully achieved the designed load-bearing capacity and serviceability requirements.

DOI:

10.14359/20138


Document: 

SP250-08

Date: 

March 1, 2008

Author(s):

H.-W. Reinhardt, M. Krüger, M. Raupach, and J. Orlowsky

Publication:

Symposium Papers

Volume:

250

Abstract:

Textile-reinforced concrete has great potential for use in lightweight, thin-walled structural components. Since such elements participate directly in load transmission in the structural framework, satisfactory fire resistance is often desirable. Experience until now, however, has been limited with respect to the behavior of textile concrete elements subjected to fire. In this investigation, four fire tests have been performed on textile-reinforced concrete sections (I-profiles), in which one side of the sections was exposed to fire. The textiles tested were AR glass, carbon, and carbon coated with styrene butadiene. These experiments demonstrated that the load-bearing behavior of textile-reinforced structural components in fire greatly depends on the textile used, their bond to the concrete, and the behavior of the concrete under high temperatures.

DOI:

10.14359/20143


Document: 

SP250-06

Date: 

March 1, 2008

Author(s):

J. Hegger, H.N. Schneider, S. Voss, and I. Bergmann

Publication:

Symposium Papers

Volume:

250

Abstract:

Textile-reinforced concrete (TRC) is a composite material consisting of textile reinforcement and fine-grained concrete. Because of different bond performance and material properties of textiles compared to reinforcing steel, the load-bearing behavior of TRC differs from that of ordinary reinforced concrete. As a consequence, the design methods for ordinary reinforced concrete cannot be directly applied to TRC structures. This paper investigates the load-bearing behavior of TRC. Design methods for TRC are derived considering different textile properties and different loading conditions such as tension, bending, and shear. Based on the extensive theoretical and experimental investigations conducted, design methods have been derived that allow the dimensioning of TRC structures. Further investigations are aimed at identifying appropriate applications for TRC. The results of theoretical and experimental investigations conducted have been put into practice by producing TRC elements for applications such as façade elements, formworks, and tanks.

DOI:

10.14359/20141


Document: 

SP250-07

Date: 

March 1, 2008

Author(s):

A. Peled and B. Mobasher

Publication:

Symposium Papers

Volume:

250

Abstract:

The objective of this study was to investigate use of pultrusion technique as a cost-effective method for the production of thin-sheet fabric-reinforced cement composites. Cement-based composites were developed with different fabric types using cast (hand layup) process and pultrusion (impregnated) methods. Knitted fabric made from low-modulus polypropylene (PP) fabric, woven fabric made from low-modulus polyethylene (PE), and bonded glass meshes were used. Tensile and pullout tests as well as SEM observations were used to examine the mechanical, bonding, and microstructure properties. It was observed that the processing method significantly affects the bond as well as the tensile performance of the composite. The best performance was achieved for the polypropylene pultruded composites.

DOI:

10.14359/20142


Document: 

SP250

Date: 

March 1, 2008

Author(s):

Editor: Ashish Dubey / Sponsored by: ACI Committee 549

Publication:

Symposium Papers

Volume:

250

Abstract:

Textile-reinforced concrete (TRC) is a high-performance composite material in which technical textiles composed of high-performance reinforcement fibers are embedded in a cementitious matrix. The technical textiles used in TRC are continuous reinforcement composed of a variety of materials such as alkali-resistant glass, carbon, aramid, and polymeric fibers. The continuous textile reinforcement provides enhanced tensile strength, ductility, and other features to the finished TRC composites. The TRC composites tend to be slender, lightweight, and capable of being designed into complex geometrical shapes and configurations. Thin TRC elements are also effective in retrofitting and strengthening existing weak and dilapidated concrete structures. Consequently, the use of TRC continues to grow very rapidly worldwide in a variety of applications. The material science and technology of textile reinforcement and cementitious matrix used for producing TRC composites is advancing rapidly, and is an active area of research and development in both academia and industry. This symposium publication contains papers originally presented in a symposium on TRC sponsored by ACI Committee 549 during the ACI Fall 2005 Convention in Kansas City, Missouri, USA. The symposium explored the current state-of-the-art and recent advances in material science, mechanical behavior, production methods, and practical applications of TRC. Important topics covered in this publication include material science and technology of textile reinforcement and cementitious matrix used in TRC, design methods for TRC, structural behavior of TRC, applications of TRC, production methods of TRC, and numerical modeling of TRC composites. The papers presented in this publication have been peer reviewed by the experts in the field according to the guidelines established by the American Concrete Institute. It should be emphasized that the future of TRC depends largely on its ability to compete cost effectively with the existing and other alternate emerging technologies. Because TRC is an emerging technology in itself, considerable research and development efforts are needed on various fronts to make the art viable and acceptable to end users and the industry. Significant research efforts are required to develop textile reinforcements that are strong, durable, processable, and economical. It is also crucial that research efforts be made to develop cement-based matrixes that have good compatibility and durability characteristics with the textile reinforcements involved. Further research and development efforts are also necessary to develop new processing methods for producing TRC composites efficiently and cost effectively.

DOI:

10.14359/19726


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