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Interface Transition Zone and the Elastic Modulus of Cement-Based Composites

Published online by Cambridge University Press:  21 February 2011

Peter I. Simeonov  and
S.H. Ahmad
Peter I. Simeonov
Affiliation:
Department of Civil Engineering, NC State University, Raleigh, NC 27695
S.H. Ahmad
Affiliation:
Department of Civil Engineering, NC State University, Raleigh, NC 27695
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Abstract

The influence of the Interface Transition Zone (ITZ) on the elastic modulus of concrete is demonstrated as a divergence of the experimental data from the general trend of the theoretical Hashin-Shtrikman bounds. This divergence is well related to the W/C of the composite. With reduction of W/C the influence of ITZ decreases and for values close to 0.4 and lower it is insignificant.

The formation of the ITZ is characterized by a transfer of water from the matrix to the surface of the aggregates. As a result of this a highly porous ITZ is formed while the matrix remains with a reduced porosity. This process can also be described as a transfer of material properties. For some compositions the balance of this transfer can approach zero. The imbalance in this process is more pronounced at higher W/C.

The effect of Interface Transition Zone can be successfully simulated by the help of recently derived Hashin's variational bounds for two-phase composites with imperfect interfaces.

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 , 397
Copyright
Copyright © Materials Research Society 1995

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