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The early hydration and the set of Portland cements: In situ X-ray powder diffraction studies

Published online by Cambridge University Press:  01 March 2012

M. Merlini ,
G. Artioli ,
C. Meneghini ,
T. Cerulli ,
A. Bravo  and
F. Cella
M. Merlini*
Affiliation:
Dipartimento di Scienze della Terra “Ardito Desio”, Università degli studi di Milano, Via Botticelli 23, 20133 Milano, Italy
G. Artioli
Affiliation:
Dipartimento di Scienze della Terra “Ardito Desio”, Università degli studi di Milano, Via Botticelli 23, 20133 Milano, Italy
C. Meneghini
Affiliation:
Dipartimento di Fisica “E. Amaldi”, Università di Roma Tre, Via della Vasca Navale, Roma, Italy
T. Cerulli
Affiliation:
Research and Development Laboratory, MAPEI S.p.A., Via Cafiero, Milano, Italy
A. Bravo
Affiliation:
Research and Development Laboratory, MAPEI S.p.A., Via Cafiero, Milano, Italy
F. Cella
Affiliation:
Research and Development Laboratory, MAPEI S.p.A., Via Cafiero, Milano, Italy
*
a)Presently at ESRF, European Synchrotron Radiation Facility, 6 rue Jules Horowitz, BP220, 38043, Grenoble, France.
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Abstract

The hydration of ordinary Portland cements (OPC) was investigated with X-ray powder diffraction (XRPD) technique, mainly using synchrotron radiation. In situ experiments were performed during the first hours of hydration to study the evolution of the crystalline phases in the system. The hydration was carried out with pure water and in the presence of additives such as superplasticizers and setting accelerating agents. As soon as water is added to the cement, ettringite crystallizes. Its evolution appears to be very complex, and lattice parameters change as a function of setting time, indicating a possible chemical evolution of ettringite with time and as a function of pH. CSH (Ca-Si-hydrate) forms after a few hours from the beginning of hydration. CSH can be indirectly quantified and its evolution studied.

Keywords

Portland cementX-ray powder diffractionRietveld methodquantitative analysisamorphous phasekinetics
Type
Technical Articles
Information
Powder Diffraction , Volume 22 , Issue 3 , September 2007 , pp. 201 - 208
Copyright
Copyright © Cambridge University Press 2007

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