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Insights into Early Hydration of Portland Limestone Cement from Infrared Spectroscopy and Isothermal Calorimetry

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Author

Summary, in English

Isothermal calorimetry and diffuse reflectance infrared DR–FTIR spectroscopy are combined to correlate evolutions of spectroscopic signatures with rates of chemical reactions as reflected in the rate of heat emitted during the first 38 h of cement hydration. Portland limestone cement mortar is employed and the analysis is repeated for two different mixing procedures. Intensive blender mixing with quartz sand is found to cause activation of the cement resulting in a faster hydration process. At early stages of hydration, two types of C–S–H are formed. The spectral intensity of the earlier C–S–H is found to saturate, while that of the later form continues to acquire intensity throughout the 38 h of the experiment. Evidences are presented which support the interpretation that the two forms differ mainly in morphology and water content. Simultaneously with the saturation of the early C–S–H, a transient species is observed with DR–FTIR. This species correlates with

the observed thermogram fine-structure.

Publishing year

2010

Language

English

Pages

1541-1546

Publication/Series

Cement and Concrete Research

Volume

40

Issue

10

Document type

Journal article

Publisher

Elsevier

Topic

  • Materials Engineering

Keywords

  • Calorimetry
  • Hydration
  • Calcium–silicate–hydrate (C–S–H)
  • Spectroscopy
  • Hydration products

Status

Published

ISBN/ISSN/Other

  • ISSN: 0008-8846