Nondestructive determination of drying deformations in cement paste by means of ESEM and digital image analysis

Dragana Jankovic

doi:10.1117/12.780731

25 April 2008 Nondestructive determination of drying deformations in cement paste by means of ESEM and digital image analysis

Dragana Jankovic

Author Affiliations +

Proceedings Volume 6995, Optical Micro- and Nanometrology in Microsystems Technology II; 69950G (2008) https://doi.org/10.1117/12.780731
Event: SPIE Photonics Europe, 2008, Strasbourg, France

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.

Citation Download Citation

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); https://doi.org/10.1117/12.780731

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available