Computed Tomography Study of Fibre Reinforced Autoclaved Aerated Concrete

Gerd Weidemann; Ronny Stadie; Jürgen Goebbels; Bernd Hillemeier

doi:10.3139/120.100879

Article

Computed Tomography Study of Fibre Reinforced Autoclaved Aerated Concrete

Gerd Weidemann , Ronny Stadie , Jürgen Goebbels and Bernd Hillemeier

Published/Copyright: May 28, 2013

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From the journal Materials Testing Volume 50 Issue 5

Abstract

A preferential orientation of fibres is induced by the production process of fibre reinforced autoclaved aerated concrete. For a better understanding of the development of the fibre arrangement during the foaming process of the concrete, digital radiography was used to study the evolution of orientation in situ. The strength and the deformation behaviour of this building material are largely influenced by the fibre orientation. Therefore information on the fibre orientation is highly desirable. Computed tomography measurements allow for the non destructive investigation of the material. The contrast between fibres and concrete matrix is sufficiently high, even for glass fibres. Two different ways to study the fibre orientation are compared. The results correlate with the strength and the deformation behaviour of the samples. A high resolution study of the fibre environment shows that the fibres align the adjacent pores.

Kurzfassung

Fasern in Porenbeton können bedingt durch den Herstellungsprozess eine Vorzugsorientierung aufweisen. Digitale Radiographie wurde eingesetzt, um die Orientierungsentwicklung der Fasern während des Aufschäumprozesses von Beton in situ zu studieren. Die Festigkeit und das Deformationsverhalten dieses Baustoffs werden stark durch die Faserorientierung beeinflusst. Daher sind Informationen über die Faserorientierung von Interesse. Messungen mit Computertomographie ermöglichen die zerstörungsfreie Charakterisierung des Baustoffs. Der Kontrast zwischen Fasern und Betonmatrix ist hinreichend hoch für Glasfasern. Zwei unterschiedliche Methoden, die Faserorientierung zu untersuchen, werden verglichen. Die Ergebnisse korrelieren mit der Festigkeit und dem Deformationsverhalten der Proben. Eine Untersuchung der Faserumgebung mit erhöhter Ortsauflösung zeigt, dass die Fasern die benachbarten Poren ausrichten.

Dr. rer. nat. Gerd Weidemann studied crystallographie at the Humbold-University, Berlin. After his studies he was research assistant at the Max-Planck-Institut, where he received his doctor's degree. Since 1998 he is working as research assistant at the Bundesanstalt für Materialforschung und -prüfung, BAM, Berlin. He is engaged in the development of computed tomography.

Dipl.-Ing. Ronny Stadie studied civil engineering at the FHTW, Berlin. Since 2004 he is doing his doctorat at the department of construction materials at the TU Berlin.

Dr. rer. nat. Jürgen Goebbels studied physics at the University of Karlsruhe (TH). Since 1982 he is working at the Bundesanstalt für Materialforschung und -prüfung, BAM, Berlin. He is head of the computed tomography team.

Prof. Dr.-Ing. Bernd Hillemeier studied civil engineering at the University of Karlsruhe (TH), where he also received his doctor's degree. Since 1992 he is working as Professor at the institut of civil engineering at the TU Berlin.

References

1 Stadie, R.: Festigkeits- und Verformungsverhalten von kurzfaserverstärktem Porenbeton. Dissertation, work in progress, TU Berlin, presumably 2007.Search in Google Scholar

2 Fraunhofer Institut für Techno- und Wirtschaftsmathematik, MAVI – Modulare Algorithmen für Volumenbilder, Fraunhofer-Platz 1, 67663 Kaiserslautern, Germany, http://www.itwm.fhg.de/mab/projects/MAVI/MAVI_Manual.pdf.Search in Google Scholar

Published Online: 2013-05-28

Published in Print: 2008-05-01

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https://doi.org/10.3139/120.100879