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A Model for the Distribution of Pore Sizes in Cement Paste

Published online by Cambridge University Press:  22 February 2011

D. Shi ,
P. W. Brown  and
S. Kurtz
D. Shi
Affiliation:
The Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
P. W. Brown
Affiliation:
The Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
S. Kurtz
Affiliation:
The Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
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Abstract

The pore size distribution in cement paste over the range of pore sizes interrogated by high pressure mercury intrusion porosimetry may be described by a mixture of two lognormal distributions. The compound distribution of pore sizes may be given as:

where p(x) is the probability density function of pores of size x, f and (1−f) are the weights of sub-distributions, μ1 and μ2 are the location parameters of sub-distributions, and σ1 and σ2 are the shape parameters of sub-distributions. These two sub-distributions may represent the larger and smaller capillary pores respectively. The changes in the sub-distributions and the compound distribution as functions of curing age and water-to-cement ratio are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 137: Symposium P – Pore Structure and Permeability of Cementitious Materials , 1988 , 23
Copyright
Copyright © Materials Research Society 1989

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