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Ultrasonic sound speed analysis of hydrating calcium sulphate hemihydrate

Ultrasonic sound speed analysis of hydrating calcium sulphate hemihydrate This article focuses on the hydration, and associated microstructure development, of β-hemihydrate to dihydrate (gypsum). The sound velocity is used to quantify the composition of the fresh slurry as well as the hardening and hardened—porous—material. Furthermore, an overview of available hydration kinetic and volumetric models for gypsum is addressed. The presented models predict the sound velocity through slurries and hardened products. These states correspond to the starting and ending times of the hydration process. The present research shows that a linear relation between the amount of hydration-product (gypsum) formed and sound velocity (Smith et al., J Eur Ceram Soc 22(12):1947, 2002) can be used to describe this process. To this end, the amount of hydration-product formed is determined using the equations of Schiller (J Appl Chem Biotechnol 24(7):379, 1974) for the hydration process and of Brouwers (A hydration model of Portland cement using the work of Powers and Brownyard, 2011) for the volume fractions of binder, water and hydration products during the hydration process. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science Springer Journals

Ultrasonic sound speed analysis of hydrating calcium sulphate hemihydrate

Journal of Materials Science , Volume 46 (22) – Jun 28, 2011

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References (45)

Publisher
Springer Journals
Copyright
Copyright © 2011 by The Author(s)
Subject
Materials Science; Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics
ISSN
0022-2461
eISSN
1573-4803
DOI
10.1007/s10853-011-5682-6
Publisher site
See Article on Publisher Site

Abstract

This article focuses on the hydration, and associated microstructure development, of β-hemihydrate to dihydrate (gypsum). The sound velocity is used to quantify the composition of the fresh slurry as well as the hardening and hardened—porous—material. Furthermore, an overview of available hydration kinetic and volumetric models for gypsum is addressed. The presented models predict the sound velocity through slurries and hardened products. These states correspond to the starting and ending times of the hydration process. The present research shows that a linear relation between the amount of hydration-product (gypsum) formed and sound velocity (Smith et al., J Eur Ceram Soc 22(12):1947, 2002) can be used to describe this process. To this end, the amount of hydration-product formed is determined using the equations of Schiller (J Appl Chem Biotechnol 24(7):379, 1974) for the hydration process and of Brouwers (A hydration model of Portland cement using the work of Powers and Brownyard, 2011) for the volume fractions of binder, water and hydration products during the hydration process.

Journal

Journal of Materials ScienceSpringer Journals

Published: Jun 28, 2011

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