Reference: D.P. Bentz, D.A. Quenard, V. Baroghel-Bouny, E.J. Garboczi, and H.M. Jennings, Materials and Structures 28, 450-458 (1995).
PDF version of original paper

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MODELLING DRYING SHRINKAGE OF CEMENT PASTE AND MORTAR: PART 1. STRUCTURAL MODELS FROM NANOMETERS TO MILLIMETERS

Dale P. Bentz and Edward J. Garboczi
Building Materials Division
National Institute of Standards and Technology
Gaithersburg, MD 20899 USA

Daniel A. Quenard
Centre Scientifique et Technique du Batiment
38400 Saint-Martin d'Heres, FRANCE

Veronique Baroghel-Bouny
Laboratoire Central des Ponts et Chaussess
75732 Paris, FRANCE

Hamlin M. Jennings
Departments of Civil Engineering and Materials Science and Engineering
Northwestern University
Evanston, IL 60208 USA

Abstract

The nanostructure of calcium silicate hydrate gel contributes to many physical properties of concrete, including the important engineering properties of creep and shrinkage. A set of structural models for this gel and computational techniques for their validation have been developed. The basic nanostructure of C-S-H is conceived as a self-similar agglomeration of spherical particles at two levels (diameters of 5 and 40 nm). Computational techniques are presented for simulating transmission electron microscopy images and computing sorption characteristics of the model nanostructures. Agreement with available experimental data is reasonable. The development of these nanostructural models is a first step in a multi-scale approach to computing the drying shrinkage of model cement-based materials. Such an approach will provide a better understanding of the relationships between microstructure and the shrinkage behavior of these systems.





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