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Journal of Materials Science

, Volume 41, Issue 21, pp 7210–7217 | Cite as

Effect of malic and citric acid on the crystallisation of gypsum investigated by coupled acoustic emission and electrical conductivity techniques

  • A. Ersen
  • A. Smith
  • T. Chotard
Article

Abstract

Plaster or gypsum (CaSO4·2H2O) is obtained from a suspension of β calcium hemihydrate (CaSO4·1/2H2O). The effect of two additives, known to retard setting, namely citric and malic acids, on the electrical conductivity and on the acoustic emission (AE) has been studied. This work presents the correlation obtained between these two techniques and their ability to differentiate between the crystallisation of a plaster with or without an organic additive. In particular, the surface adsorption of these carboxylic acids on solid surfaces has been evidenced by a specific acoustic emission activity.

Keywords

Citric Acid Gypsum Acoustic Emission Malic Acid Acoustic Emission Signal 

Notes

Acknowledgement

The authors want to thank the “Conseil Regional du Limousin” for Dr Ersen’s financial support.

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  1. 1.Groupe d’Etude des Matériaux Hétérogènes (GEMH, EA 3178) Ecole Nationale Supérieure de Céramique IndustrielleLimoges CedexFrance
  2. 2.Département Génie Mécanique et ProductiqueInstitut Universitaire de TechnologieLimoges CedexFrance

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