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Interfacial Zone Percolation in Concrete: Effects of Interfacial Zone Thickness and Aggregate Shape

Published online by Cambridge University Press:  21 February 2011

D.P. Bentz ,
J.T.G. Hwang ,
C. Hagwood ,
E.J. Garboczi ,
K.A. Snyder ,
N. Buenfeld  and
K.L. Scrivener
D.P. Bentz
Affiliation:
Building and Fire Research Laboratory, Building 226, Room B-350, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
J.T.G. Hwang
Affiliation:
Cornell University, Ithaca, NY 14853, USA
C. Hagwood
Affiliation:
Building and Fire Research Laboratory, Building 226, Room B-350, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
E.J. Garboczi
Affiliation:
Building and Fire Research Laboratory, Building 226, Room B-350, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
K.A. Snyder
Affiliation:
Building and Fire Research Laboratory, Building 226, Room B-350, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
N. Buenfeld
Affiliation:
Imperial College of Science and Technology, London, SW7 2BP, ENGLAND
K.L. Scrivener
Affiliation:
Imperial College of Science and Technology, London, SW7 2BP, ENGLAND
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Abstract

Previously, a hard core/soft shell computer model was developed to simulate the overlap and percolation of the interfacial transition zones surrounding each aggregate in a mortar or concrete. The aggregate particles were modelled as spheres with a size distribution representative of a real mortar or concrete specimen. Here, the model has been extended to investigate the effects of aggregate shape on interfacial transition zone percolation, by modelling the aggregates as hard ellipsoids, which gives a dynamic range of shapes from plates to spheres, to fibers. For high performance concretes, the interfacial transition zone thickness will generally be reduced, which will also affect their percolation properties. This paper presents results from a study of the effects of interfacial transition zone thickness and aggregate shape on these percolation characteristics.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 370: Symposia Va/Vb – Microstructure of Cement-Based Systems/Bonding and Interfaces in Cement... , 1994 , 437
Copyright
Copyright © Materials Research Society 1995

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