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The Use of Digital Images to Determine Deformation Throughout a Microstructure. Part II: Application to Cement Paste

Published

Author(s)

C M. Neubauer, Hamlin M. Jennings

Abstract

This paper studies the role of age, w/c ratio, and curing temperature on the drying shrinkage of cement paste that occurred during drying in two large relative humidity (RH) decrements: 90% --> 50% RH, and 90% --> 5% RH. Drying shrinkage occurring between 90% RH and 50% RH was generally associated with capillary porosity and was sensitive to w/c ratio, age, and curing temperature. Drying shrinkage occurring between 90% RH and 5% RH was generally associated with the C-S-H and was relatively independent of w/c ratio, age, and curing temperature. It was found that drying shrinkage is controlled by the interaction between expanding regions (rarefactions) and contracting regions (compactions) in the cement paste. These regions have distinct morphologies, with the compactions forming fields that are uniformly distributed throughout the microstructure, while the rarefactions form crack-like formations that separate the compaction fields.
Citation
Journal of Materials Science
Volume
35
Issue
No. 22

Keywords

building technology, cement paste, drying, microstructure, shrinkage

Citation

Neubauer, C. and Jennings, H. (2000), The Use of Digital Images to Determine Deformation Throughout a Microstructure. Part II: Application to Cement Paste, Journal of Materials Science (Accessed April 20, 2024)
Created November 1, 2000, Updated February 19, 2017