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Title: Methods to determine hydration states of minerals and cement hydrates

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 Na{sub 2}SO{sub 4}–H{sub 2}O 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.
Authors:
 [1] ;  [1] ;  [2] ; ; ;  [3]
  1. Innovation, Holcim Technology Ltd., CH-5113 Holderbank (Switzerland)
  2. Laboratory of Construction Materials, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne (Switzerland)
  3. Building Materials, Lund University, Box 124, 221 000 Lund (Sweden)
Publication Date:
OSTI Identifier:
22395928
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 65; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION; CEMENTS; DEHYDRATION; HUMIDITY; HYDRATES; HYDRATION; MINERALS; SIMULATION; SODIUM SULFATES; STABILITY; THERMODYNAMIC PROPERTIES; WATER