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Effects of Interfacial Zone Percolation on Cement-Based Composite Transport Properties

Published online by Cambridge University Press:  15 February 2011

K.A. Snyder ,
D.N. Winslow ,
D.P. Bentz  and
E.J. Garboczi
K.A. Snyder
Affiliation:
Bldg. Materials Div., National Institute of Standards and Technology, Gaithersburg, MD 20899
D.N. Winslow
Affiliation:
Dept. of Civil Engineering, Purdue University, West Lafayette, IN 47907
D.P. Bentz
Affiliation:
Bldg. Materials Div., National Institute of Standards and Technology, Gaithersburg, MD 20899
E.J. Garboczi
Affiliation:
Bldg. Materials Div., National Institute of Standards and Technology, Gaithersburg, MD 20899
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Abstract

In portland cement mortar and concrete, interfacial zones exist around the aggregate particles that have larger pore sizes and pore volumes than the bulk cement paste. If there are enough aggregate particles present, these zones may overlap so as to percolate. A computer simulation model has been developed that can predict this percolation point as a function of interfacial zone thickness, volume fraction of aggregates, and aggregate particle size distribution. The model was used to simulate 1cm3 of mortar, using approximately 10,000 aggregate particles. Results from this model are used to explain recent mercury porosimetry results on mortars having a variety of sand contents. The implications of interfacial zone percolation for the transport properties of mortar and concrete are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 245: Symposium K – Advanced Cementitious Systems: Mechanisms and Properties , 1991 , 265
Copyright
Copyright © Materials Research Society 1992

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References

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