Print Email Facebook Twitter Nondestructive determination of drying deformations in cement paste by means of ESEM and digital image analysis Title Nondestructive determination of drying deformations in cement paste by means of ESEM and digital image analysis Author Jankovic, D. Faculty Civil Engineering and Geosciences Department Micro Mechanic Laboratory Date 2008-06-02 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. Subject dryingcement paste microstructureESEMshrinkagemicrocrackingcoefficient of deformations To reference this document use: http://resolver.tudelft.nl/uuid:cb25a16b-356f-4642-9613-7522f8fff5b3 Publisher SPIE ISSN 0277-786X Source Proceedings of SPIE, 2008 vol. 6995 Part of collection Institutional Repository Document type conference paper Rights (c)2008 Jankovic, D. Files PDF Nondestructive.Jankovic.pdf 614.58 KB Close viewer /islandora/object/uuid:cb25a16b-356f-4642-9613-7522f8fff5b3/datastream/OBJ/view