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

In English

Författare

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.

Publiceringsår

2010

Språk

Engelska

Sidor

1541-1546

Publikation/Tidskrift/Serie

Cement and Concrete Research

Volym

40

Issue

10

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Materials Engineering

Nyckelord

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

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0008-8846