This chapter covers the percolation, transport, and elastic properties of cement paste. The results of model studies are used to understand how the pore structure of cement paste is controlled by its percolation properties, and how this pore structure helps determine transport and elastic properties.

This section covers the percolation properties of cement paste, covering capillary porosity, C-S-H, and CH. The C

(1a) Percolation of phases in a three-dimensional cement paste microstructural model

This section updates the percolation properties of the cement hydration model for portland cement chemistry and more realistic cement particle size distributions, and in addition, discusses the effect of various numerical uncertainties on the results of the model. Transport properties (fluid permeability vs. ionic diffusivity) are also discussed and updated for the model.

(1b) The effect of statistical fluctuation, finite size error, and digital resolution on the phase percolation and transport properties of the NIST cement hydration model

(1c) Influence of Alkalis on Porosity Percolation in Hydrating Cement Pastes

(1d) Lithium, Potassium, and Sodium Additions to Cement Pastes

(1e) Capillary Porosity Depercolation/Repercolation in Hydrating Cement Pastes via Low Temperature Calorimetry Measurements and CEMHYD3D Modeling

This section discusses the modelling of the diffusivity of cement paste, using the C

(2a) Computer simulation of the diffusivity of cement-based materials

The equation for diffusivity as a function of porosity was updated via experimental data and simulations that were conducted on a complete portland cement hydration model (including silica fume).

(2b) Influence of Silica Fume on Diffusivity in Cement-Based Materials. I. Experimental and Computer Modeling Studies on Cement Pastes

This section describes direct comparisons, at room temperature, between
experiment and simulation for the DC conductivity of white cement
paste.

(3) Experimental and computer simulation results for the electrical conductivity of portland cement paste

This section describes more direct comparisons, at room temperature, between
experiment and simulation for the DC conductivity of portland cement
paste. The experimental technique used is impedance spectroscopy.

(4) Interpretation of the impedance spectroscopy of cement paste via computer modelling I: Bulk conductivity and offset resistance

This section describes direct comparisons, at room temperature, between
experiment and simulation for the dielectric properties of portland cement
paste. The experimental technique used is impedance spectroscopy. The
dielectric properties are considered in the low frequency limit.

(5) Interpretation of the impedance spectroscopy of cement paste via computer modelling II: Dielectric response

This section describes direct comparisons, at -40C, between
experiment and simulation for the DC electrical conductivity of
portland cement
paste. The experimental technique used is impedance spectroscopy.

(6) Interpretation of the impedance spectroscopy of cement paste via computer modelling III: Microstructural analysis of frozen cement paste

The linear elastic moduli of cement paste are key parameters, along with the
cement paste compressive and tensile strengths, for characterizing the mechanical response of mortar and concrete. Predicting these moduli is difficult, as these materials are random, complex, multiscale composites. This paper describes how finite element procedures combined with knowledge of individual phase moduli are used, in combination with a cement paste microstructure development model,
to quantitatively predict elastic moduli as a function of degree of hydration, as measured by loss on ignition.

(7) Modeling the linear elastic properties of portland cement paste

This section presents an argument for the usage of coarser cements
in high performance concretes based on microstructural modelling
of cement paste microstructure and analysis of hydration progress and
pore space percolation.

(8) An argument for using coarse cements in high performance concretes

This section presents a more detailed study of the effects of cement particle
size distribution on numerous physical properties of cement-based materials,
using microstructural modelling and computer-based prediction of properties.

(9a) Effects of cement particle size distribution on performance properties of portland cement-based materials

(9b) Effects of Cement PSD on Porosity Percolation and Self-Desiccation

(10a) Prediction of Cement Physical Properties by Virtual Testing

(10b) Cement Hydration: Building Bridges and Dams at the Microstructure Level

(11a) Transient Plane Source Measurements of the Thermal Properties of Hydrating Cement Pastes

Go back to 4. Microstructure development of cement paste phases

References

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(1b) E.J. Garboczi and D.P. Bentz, *Cement and Concrete Research* **31**
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(1c) D.P. Bentz, *Cement and Concrete Composites* **28** (5), 427-4331 (2006).

(1d) D.P. Bentz, *Advances in Cement Research* **18** (2), 65-70 (2006).

(1e) D.P. Bentz, *Journal of the American Ceramic Society* **89** (8) 2606-2611 (2006).

(2a) E.J. Garboczi and D.P. Bentz, *Journal of Materials Science* **27**,
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(2b) D.P. Bentz, O.M. Jensen, A.M. Coats, F.P. Glasser, *Cement and Concrete Research* **30**, 953-962 (2000).

(3) B.J. Christensen, T.O. Mason, D.P. Bentz, and E.J. Garboczi, in
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(4) R.T. Coverdale, B.J. Christensen, T.O. Mason, H.M. Jennings, E.J. Garboczi,
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(5) R.T. Coverdale, B.J. Christensen, T.O. Mason, H.M. Jennings, and E.J. Garboczi,
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(6) R.A. Olson, B.J. Christensen, R.T. Coverdale, S.J. Ford, G.M. Moss, H.M. Jennings, T.O. Mason, and E.J. Garboczi, *Journal of Materials Science* **30**,
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(7) C.-J. Haecker, E.J. Garboczi, J.W. Bullard, R.B. Bohn, Z. Sun, S.P.
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(8) D.P. Bentz and C.J. Haecker, *Cement and Concrete Research* **29** (4), 615-618 (1999).

(9a) D.P. Bentz, E.J. Garboczi, C.J. Haecker, and O.M. Jensen,
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(9b) D.P. Bentz, published in *Self-Desiccation and Its Importance in
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(10a) D.P. Bentz, C.J. Haecker, X.P. Feng, and P.E. Stutzman, Proceedings of
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(10b) D.P. Bentz, *Materials and Structures* **40**(4), 397-404 (2007).

(11a) D.P. Bentz, *accepted by Materials and Structures*, (2007).