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2015 | OriginalPaper | Chapter

22. Shrinkage Coefficient: Drying Microcrack Indicator

Author : Dragana Jankovic

Published in: Challenges in Mechanics of Time-Dependent Materials, Volume 2

Publisher: Springer International Publishing

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Abstract

In order to investigate the material behaviour in reality (macro-level) during drying shrinkage at early age, the shrinkage coefficient (αsh) is determined in the laboratory at micro-level on specially prepared and dried (1 mm) thick cement paste specimens. Drying shrinkage experiments are performed in Environmental Scanning Electron Microscope (ESEM). For simplicity, a relationship between drying deformations and relative humidity (ε-RH) is assumed linear. It is found out that a certain value of the ‘local’ drying shrinkage coefficient, determined in the RH range (40–20 %), presents a threshold value. Above the threshold αsh value, microcracks are noticed in specimens.

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previous chapter Effect of Moisture and Anisotropy in Multilayer SU-8 Thin Films
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Metadata
Title
Shrinkage Coefficient: Drying Microcrack Indicator
Author
Dragana Jankovic
Copyright Year
2015
Book
Challenges in Mechanics of Time-Dependent Materials, Volume 2

Print ISBN: 978-3-319-06979-1

Electronic ISBN: 978-3-319-06980-7

Copyright Year: 2015

DOI
https://doi.org/10.1007/978-3-319-06980-7_22

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