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International Concrete Abstracts Portal

Showing 1-5 of 15 Abstracts search results

Document: 

SP224-08

Date: 

December 1, 2004

Author(s):

Yixin Shao, Emmanuel Blain-Cosgrove and Brad Robinson

Publication:

Symposium Papers

Volume:

224

Abstract:

The balance between sustainability and affordability is hard to achieve when considering choices of building envelopes. A simple and easy-to-construct stressed skin structural sandwich system that is both affordable and sustainable is evaluated in this paper. The system is composed of an expanded polystyrene (EPS) panel core, wrapped in polymer mesh and covered with a thin cement skin on both sides. This system design leads to a highly energy efficient building envelope system. A full-scale sandwich wall was constructed and tested to examine the possibility of its use as a load bearing wall in one story residential house without traditional timber frames. Based on the requirements imposed by the National Building Code (NBC), the test results from this experimental program were found to be promising. The wall carried a gravity load, a wind load and seismic in-plane shear load at least 4 times as high as the NBC design load with negligible lateral displacement and no visible cracking. At buckling failure, the load-carrying capacity of the wall exceeded 10 times the design load. The EPS-core stressed-cement skin sandwich building system thus provides a good example of the use of thin cementitious products in load bearing exterior wall structural applications.

DOI:

10.14359/13411


Document: 

SP224-05

Date: 

December 1, 2004

Author(s):

J. Hegger, H. Schneider, A. Sherif, M. Molter and S. Voss

Publication:

Symposium Papers

Volume:

224

Abstract:

The composite material textile reinforced concrete (TRC) offers a number of advantages, in particular for the manufacturing of façades. The textile reinforcement and the possible thin concrete cover, enable the construction of thin-walled structural components. Filigree cladding panels made of textile reinforced concrete open up new ways for an entirely new application of the construction material concrete and give architects and engineers more freedom in the design. In this paper some basic information about the load bearing behavior of textile reinforced concrete is given and the use of textile reinforced concrete in a pilot project for the exterior claddings of the extension of the laboratory hall at the RWTH Aachen University, Germany, is described.

DOI:

10.14359/13408


Document: 

SP224-01

Date: 

December 1, 2004

Author(s):

Graham T Gilbert

Publication:

Symposium Papers

Volume:

224

Abstract:

Thin, fiber reinforced cementitious products offer a useful balance of properties such as strength, toughness, environmental durability, moisture resistance, dimensional stability, fire resistance, aesthetics and ease of handling and installation. For more than 30 years, AR glass fibers have been at the forefront in the development of new applications of such products throughout the World. Glass Fiber Reinforced Concrete [GFRC] is a thin, cement composite based on AR glass fibers with an excellent strength to weight ratio. Extensive early laboratory work produced a test method for determining long term strength. The validity of this work has been proven by the large number of buildings clad with GFRC, as well as a vast range of other GFRC products, used over a this 30 year period. This paper explains the fundamental principles behind GFRC and gives examples of some of its uses. These applications range from high quality, architectural wall panels and decorative elements through to modular buildings down to low cost channel sections and utility components. New developments and techniques will also be discussed.

DOI:

10.14359/13404


Document: 

SP224-02

Date: 

December 1, 2004

Author(s):

Gregor Vilkner and Christian Meyer

Publication:

Symposium Papers

Volume:

224

Abstract:

Thin sheet concrete products are receiving increased attention because of the large number of potential applications. By using crushed glass as aggregate, a multitude of different esthetic effects can be produced, which again open up numerous architectural and decorative uses. Such thin sheets are most effectively reinforced with fiber mesh, whether made of polypropylene, AR-glass, or other types of materials. At Columbia University, a project is currently under way to explore the possibilities of prestressing thin sheet glass concrete products. There are numerous performance criteria that need to be satisfied by the fiber mesh material in order to qualify for the tasks on hand. Most promising to date are high-performance materials such as aramid and carbon fiber mesh. This paper discusses the elimination process by which the most appropriate type of fiber mesh was selected. Various technical problems of prestressing and anchoring the fiber mesh are pointed out, as well as other issues that need to be resolved, before such products can be mass-produced commercially.

DOI:

10.14359/13405


Document: 

SP224-09

Date: 

December 1, 2004

Author(s):

Daniela Hesselbarth and Josef Kaufmann

Publication:

Symposium Papers

Volume:

224

Abstract:

Concrete tubes are usually produced by a centrifugation method using steel bar reinforcements. The reinforcement of concrete with steel bars is expensive, susceptible to corrosion and leads to rather thick and heavy structural elements. The application of short fiber reinforced cement (FRC) or mortar is a suitable alternative. The paper presents the development and evaluation of a suitable FRC for this particular application. First, the cement matrix was optimized for use in a conventional casting forming process. A mixture of ultra-fine cement and ordinary Portland cement improves the rheological properties of the fresh mixture and results in a very dense cement matrix with excellent mechanical properties. This optimized cement matrix was then reinforced with different kinds of carbon and polymeric fibers such as PVA and PP. Hereby, the carbon fibers primarily increase the flexural and tensile strength of the material, whereas the polymer fibers tend to improve the ductility of the cement matrix. Furthermore, the influence of water-reducing agents, of different constituents (microsilica, filler, sand), and the mixing process on the mechanical properties were studied. The mechanical properties were found to depend also on the curing conditions of the hydrated samples. The microstructure and the fiber-matrix interface were investigated by ESEM (Environmental Scanning electron microscope). In a further test series, the mixtures were optimized with regard to the flow properties needed for the centrifugation process. The mechanical properties and the microstructure were investigated. As a result, this work shows the possibility to apply the FRC for industrial production of centrifuged tubes.

DOI:

10.14359/13412


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