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Proceedings Paper

Nondestructive determination of drying deformations in cement paste by means of ESEM and digital image analysis
Author(s): Dragana Jankovic
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Paper Abstract

Novel modifications of an environmental scanning electron microscope (ESEM) were made in order to measure the local deformations in drying cement paste. These nondestructively determined moisture-induced plane strains, obtained in 1 mm thick cement paste samples, are orthotropic. They vary with variations of relative humidity between 70%-80% and 40%-50%, being the highest at 20% RH. Both drying shrinkage and expansion of cement paste microstructure occur in early-age and mature samples. Microcracking due to moisture gradient could not be avoided, although very thin samples were examined with gradual reduction of relative humidity in drying steps of 10%. The coefficient of deformation of cement paste is directly proportional to shrinkage/expansion. It depends on variations of relative humidity during drying in ESEM and the sample age.

Paper Details

Date Published: 25 April 2008
PDF: 12 pages
Proc. SPIE 6995, Optical Micro- and Nanometrology in Microsystems Technology II, 69950G (25 April 2008); doi: 10.1117/12.780731
Show Author Affiliations
Dragana Jankovic, Technische Univ. Delft (Netherlands)

Published in SPIE Proceedings Vol. 6995:
Optical Micro- and Nanometrology in Microsystems Technology II
Christophe Gorecki; Anand Krishna Asundi; Wolfgang Osten, Editor(s)

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