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Study of the dehydration of Portland Cement by Mössbauer spectrometry

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Abstract

Egyptian Portland Cement in the form of one inch cube was hydrated at different times of hydration. Nine cubes of each period of hydration were heated for five minutes 200, 300, 400 up to 1000°C then were quenched in air. The compressive strength was measured for these samples and related to unheated ones. These cubes were ground and measured by Mössbauer spectrometry to correlate the effect of dehydration of cement pastes on the states of iron, with the decrease of compressive strength. It was observed that starting from 400°C the central doublet characteristic of the hydration process decreased as the dehydration temperature was increased. At 1000°C the dehydration process was complete, the central doublet disappeared and the compressive strength vanished. The hydration process was found to be reversible. The application of Mössbauer spectrometry to estimate the degree of fire in concrete building was demonstrated.

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Authors and Affiliations

  1. Mössbauer Lab., Physics Dept., Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt

    M. Y. Hassaan, S. H. Salah & N. A. Eissa

Authors
  1. M. Y. Hassaan
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  2. S. H. Salah
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  3. N. A. Eissa
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Hassaan, M.Y., Salah, S.H. & Eissa, N.A. Study of the dehydration of Portland Cement by Mössbauer spectrometry. Hyperfine Interact 46, 733–738 (1989). https://doi.org/10.1007/BF02398266

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  • DOI: https://doi.org/10.1007/BF02398266

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