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

Ylmén, Rikard; Wadsö, Lars LU and Panas, Itai (2010) In Cement and Concrete Research 40(10). p.1541-1546
Abstract
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... (More)
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. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
Calorimetry, Hydration, Calcium–silicate–hydrate (C–S–H), Spectroscopy, Hydration products
in
Cement and Concrete Research
volume
40
issue
10
pages
1541 - 1546
publisher
Elsevier
external identifiers
  • wos:000281494200010
  • scopus:77955473081
ISSN
0008-8846
DOI
10.1016/j.cemconres.2010.06.008
language
English
LU publication?
yes
id
7dbbc34c-ebc0-4282-a721-6e623babe073 (old id 1649111)
date added to LUP
2010-08-06 09:36:13
date last changed
2017-08-06 04:49:31
@article{7dbbc34c-ebc0-4282-a721-6e623babe073,
  abstract     = {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<br/><br>
the observed thermogram fine-structure.},
  author       = {Ylmén, Rikard and Wadsö, Lars and Panas, Itai},
  issn         = {0008-8846},
  keyword      = {Calorimetry,Hydration,Calcium–silicate–hydrate (C–S–H),Spectroscopy,Hydration products},
  language     = {eng},
  number       = {10},
  pages        = {1541--1546},
  publisher    = {Elsevier},
  series       = {Cement and Concrete Research},
  title        = {Insights into Early Hydration of Portland Limestone Cement from Infrared Spectroscopy and Isothermal Calorimetry},
  url          = {http://dx.doi.org/10.1016/j.cemconres.2010.06.008},
  volume       = {40},
  year         = {2010},
}