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Methods to determine hydration states of minerals and cement hydrates

In English

Författare

  • Luis G. Baquerizo
  • Thomas Matschei
  • Karen L. Scrivener
  • Mahsa Saeidpour
  • Alva Thorell
  • Lars Wadsö

Summary, in English

This paper describes a novel approach to the quantitative investigation of the impact of varying relative humidity (RH) and temperature on the structure and thermodynamic properties of salts and crystalline cement hydrates in different hydration states (i.e. varying molar water contents). The multi-method approach developed here is capable of deriving physico-chemical boundary conditions and the thermodynamic properties of hydrated phases, many of which are currently missing from or insufficiently reported in the literature. As an example the approach was applied to monosulfoaluminate, a phase typically found in hydrated cement pastes. New data on the dehydration and rehydration of monosulfoaluminate are presented. Some of the methods used were validated with the system Na2SO4-H2O and new data related to the absorption of water by anhydrous sodium sulfate are presented. The methodology and data reported here should permit better modeling of the volume stability of cementitious systems exposed to various different climatic conditions. (C) 2014 Elsevier Ltd. All rights reserved.

Publiceringsår

2014

Språk

Engelska

Sidor

85-95

Publikation/Tidskrift/Serie

Cement and Concrete Research

Volym

65

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Materials Engineering

Nyckelord

  • Cement hydrates
  • Monosulfoaluminate
  • Hydration states
  • Thermodynamic
  • properties
  • Characterization techniques

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0008-8846