25 April 2008 Nondestructive determination of drying deformations in cement paste by means of ESEM and digital image analysis
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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.
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Dragana Jankovic, Dragana Jankovic, } "Nondestructive determination of drying deformations in cement paste by means of ESEM and digital image analysis", Proc. SPIE 6995, Optical Micro- and Nanometrology in Microsystems Technology II, 69950G (25 April 2008); doi: 10.1117/12.780731; https://doi.org/10.1117/12.780731
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