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International Concrete Abstracts Portal

Showing 1-5 of 11 Abstracts search results

Document: 

SP244-01

Date: 

May 1, 2007

Author(s):

J. Hausding, T. Engler, G. Franzke, U. Koeckritz, and P. Offermann

Publication:

Symposium Papers

Volume:

244

Abstract:

This paper presents the research activities in the field of textile reinforced concrete carried out by the Institute of Textile and Clothing Technology (ITB) of the Technische Universitaet Dresden, Germany. Extensive research has been conducted with the aim to fully use the tensile strength of the applied high-performance fiber material in the reinforcing textile. To achieve this, the textile machinery was adjusted and improved and new testing methods were developed. This research has resulted so far in several innova-tive applications for the repair of buildings as well as the production of precast concrete members. This paper was originally presented in 2005 Spring ACI Convention, New York under the title "State of the art and perspectives of textile reinforcements of con-crete components."

DOI:

10.14359/18749


Document: 

SP244-05

Date: 

May 1, 2007

Author(s):

A. Roye and T. Gries

Publication:

Symposium Papers

Volume:

244

Abstract:

Cement-based materials are brittle in nature, with high compressive strength and low tensile strength and toughness. Therefore, the use of these materials in practice involves their combination with reinforcement. This article demonstrates possible reinforcing strategies by using textile structures with high strength behavior. Different textile structures are shown as they are used in practical applications more and more. A special focus will be put to the production and design possibilities of 3D-textiles. Although there are two definitions for 3D-textiles, the 3D-structures as well as the 3D-geometries here mainly the 3D-structured spacer fabric are described. A double needle bar raschel machine is the most common machine type for this type of 3D-textile production. Those 3D-textiles allow a defined positioning of the reinforcement as well as a providing of reinforcement in the third dimension. Finally a survey of possible applications for 3D-textile reinforced concrete elements are given.

DOI:

10.14359/18753


Document: 

SP244-02

Date: 

May 1, 2007

Author(s):

B. Banholzer and W. Brameshuber

Publication:

Symposium Papers

Volume:

244

Abstract:

Although the bond of a multi-filament yarn in a cementitious matrix is controlled by the bond properties between filaments and matrix, more detailed information is needed to evaluate the failure mechanisms of such a complex system under a pull-out load and hence allow an analytical and numerical simulation of this composite. In this study innovative test methods are presented and used to identify the debonding process of a yarn as a result of the pull-out process, and ascertain the contact faces between the individual filaments and the matrix. Additionally, numerical procedures are proposed based on these findings and allow to establish a direct relationship between the load history of a pull-out test, and the failure process of an AR-glass yarn, by means of a mathematical function, defined as the active filaments versus displacement relation NF(O). Together with the load versus displacement relationship P(O) derived also during the pull-out test an analytical characterization and simulation of the bond between an AR-glass multi-filament yarn and a cement based matrix will be possible.

DOI:

10.14359/18750


Document: 

SP244

Date: 

May 1, 2007

Author(s):

Editor: Corina-Maria Alde / Sponsored by: ACI Committee 549

Publication:

Symposium Papers

Volume:

244

Abstract:

The main advantage of continuous fibers and textiles as reinforcements in cement-based composites is the enhancement of mechanical behavior. There is an improvement both in the tensile and flexural performance, as well as in the ductility of the cementitious composite. The diversity in terms of fabric making, fabric geometry, and input fiber types and yarns provides an opportunity for development of cement based composites and allows engineering of the performance of the final products for the desired requirements. Recognizing the increasing research interest in thin fiber-reinforced cement-based composites using textiles and hybrid systems (textiles and chopped fibers) and their emerging industrial applications, ACI Committee 549 sponsored a two-part technical session on “Thin Fiber and Textile Reinforced Cementitious Systems” at the ACI Spring 2005 Convention in New York. Ten papers were presented by invited international experts from Canada, Germany, Hong Kong, and the United States. This Special Publication (SP) contains ten papers which provide insight on the topics of state of the art of thin fiber and textile-reinforced cementitious systems both in academia and the industry. The topics of the papers cover experimental and theoretical materials aspects, such as the effect of different input fibers, fabric type, and construction and matrix on mechanical and long-term properties of the composite; experimental and theoretical considerations on yarn-to-matrix bond and load transfer; as well as applications of the cementitious composites proposed and examples of strengthening of reinforced concrete using textile-reinforced concrete. The future of thin fiber and textile-reinforced cementitious systems depends on their ability to compete with existing solutions and to identify new applications. Research and development efforts are required in the areas of process, design, and applications of textile-reinforced concrete.

DOI:

10.14359/18667


Document: 

SP244-03

Date: 

May 1, 2007

Author(s):

R. Chudoba, M. Konrad, M. Vorechovsky, and A. Roye

Publication:

Symposium Papers

Volume:

244

Abstract:

This paper describes two models used in the modeling strategy for textile reinforced concrete. The modeling of multi-filament yarns and of the bond between yarn and matrix is focused on micromechanical aspects of the material behavior. The calibration procedure of the model is explained on an example of a detailed experimental and numerical study of pull-out specimen. We demonstrate the use of the model for numerical homogenization to derive effective parameters at the meso level. In parametric studies we analyze the influence of local imperfections in the microstructure arising in the production process on the meso- and macromechanical properties of the material.

DOI:

10.14359/18751


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