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Hardness, elasticity modulus and flexion strength of dry set plaster

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Abstract

In this study the mechanical properties of dry set plasters are of interest. Shore C hardness of different plasters is given as a function of porosity for porosities ranging from 41 to 65 vol%. The data, and data collected from literature, show that Young's modulus follows an empirical power law for porosities ranging from 26 to 70 vol%. Flexion strengths were measured on samples of different sizes and porosities (41.4–65 vol%). As they are size dependent, strength variation cannot be correlated to the sole porosity. Finally, analysing the results with Weibull's theory led to the proposition of a brittleness scale for plasters. Brittleness increases with decreasing porosity.

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Authors and Affiliations

  1. Centre de Recherche sur les Mécanismes de la Croissance, Cristalline, CNRS, Campus de Luminy, case 913, F-13288, Marseille cedex 09, France

    P. Coquard & R. Boistelle

  2. Lafarge-Coppée Recherche, 95 Rue du Montmurier, F-38291, La Verpillière cedex, France

    L. Amathieu & P. Barriac

Authors
  1. P. Coquard
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  2. R. Boistelle
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  3. L. Amathieu
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  4. P. Barriac
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Coquard, P., Boistelle, R., Amathieu, L. et al. Hardness, elasticity modulus and flexion strength of dry set plaster. Journal of Materials Science 29, 4611–4617 (1994). https://doi.org/10.1007/BF00376285

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