Ultrasonic sound speed of hydrating calcium sulphate hemihydrate; part 2, the correlation of sound velocity to hydration degree

A.C.J. de Korte, Jos Brouwers

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Abstract

In this article the sound velocity through a mix is correlated to the hydration degree of the mix. Models are presented predicting the sound velocity through fresh slurries and hardened products. These two states correspond to the starting and finishing point of the hydration process. The present research shows that a linear relation between the amount of hydration-product (gypsum) formed (Smith et al., 2002) and sound velocity can be used to describe this process. To this end, the amount of hydration-product formed is determined by the using the equations of Schiller (1974) for the hydration process and of Brouwers (2010) for the volume fractions of binder, water and hydration products during the hydration process. The presented model shows that the induction time and gypsum growth rate are linear related to the water/gypsum-ratio.
Original languageEnglish
Title of host publicationProceedings of the Weimar gypsum conference. 30 -31 March 2011, Weimar, Germany
EditorsH.B Fischer, C. Matthes, C. Beuthan
Place of PublicationWeimar, Germany
PublisherF.A. Finger Institut für Baustoffkunde
Pages65-71
ISBN (Print)978-3-00-034074-1
Publication statusPublished - 30 Mar 2011

Publication series

Name
PublisherF.A. Finger - Institut fur Baustoffkunde

Keywords

  • IR-77512
  • METIS-275315

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    de Korte, A. C. J., & Brouwers, J. (2011). Ultrasonic sound speed of hydrating calcium sulphate hemihydrate; part 2, the correlation of sound velocity to hydration degree. In H. B. Fischer, C. Matthes, & C. Beuthan (Eds.), Proceedings of the Weimar gypsum conference. 30 -31 March 2011, Weimar, Germany (pp. 65-71). Weimar, Germany: F.A. Finger Institut für Baustoffkunde.