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Insights into early hydration of Portland limestone cement from infrared spectroscopy and isothermal calorimetry

Rikard Ylmén (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Lars Wadsö ; Itai Panas (Institutionen för kemi- och bioteknik, Oorganisk miljökemi)
Cement and Concrete Research (0008-8846 ). Vol. 40 (2010), 10, p. 1541-1546.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Calorimetry; Hydration; Calcium–silicate–hydrate (C–S–H); Spectroscopy; Hydration products



Denna post skapades 2010-08-18. Senast ändrad 2014-09-02.
CPL Pubid: 124685

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)

Ämnesområden

Spektroskopi
Spektroskopi
Konstruktionsmaterial

Chalmers infrastruktur

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Early Hydration of Portland Cement