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Cracking in Calcium Aluminate Cement Pastes Induced at Different Exposure Temperatures

  • John F. Zapata
  • Maryory Gomez
  • Henry A. ColoradoEmail author
Article
  • 17 Downloads

Abstract

Different formulations of calcium aluminate cement (CAC) pastes containing 51 and 71 wt.% Al2O3 were exposed to high-temperature environments so that the damage suffered under different thermal conditions could be studied. Samples had water-to-cement (W/C) ratios of 0.25, 0.30 and 0.40. Both the raw cement powders and their corresponding hydrated samples were characterized using scanning electron microscopy, x-ray diffraction (with Rietveld refinement), Fourier-transform infrared spectroscopy and x-ray fluorescence. All samples were exposed to oxidative environments for 1 h at 500, 800 and 1000 °C in a furnace with an air atmosphere. Hot samples were slowly cooled down in order to avoid the damage induced by thermal contraction. The damage that occurred while the samples were in the furnace and exposed to high temperatures could then be analyzed. The damage was examined by digital image analysis and the length of the cracks was fitted to Weibull distributions using Monte Carlo simulations.

Keywords

calcium aluminate cement cement pastes cracking damage gibbsite mechanical behavior Weibull distribution 

Notes

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Copyright information

© ASM International 2019

Authors and Affiliations

  1. 1.CCComposites LabUniversidad de Antioquia (UdeA)MedellínColombia
  2. 2.GISI, Institucion Universitaria de Envigado (IUE)EnvigadoColombia
  3. 3.CIDEMAT, Universidad de Antioquia (UdeA)MedellínColombia
  4. 4.Facultad de IngenieriaUniversidad de AntioquiaMedellínColombia

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