Influence of cement constitution and temperature on chloride binding in cement paste

Author:

Jensen O. Mejlhede1,Korzen M. S. H.1,Jakobsen H. J.2,Skibsted J.2

Affiliation:

1. Department of Structural Engineering and Materials, Technical University of Denmark Building 118, 2800 Lyngby, Denmark

2. Instrument Center for Solid-State NMR Spectroscopy, Department of Chemistry, University of Aarhus 8000 Aarhus C, Denmark

Abstract

This paper describes effects of cement constitution and temperature on chloride binding in cement paste, which is an important subject in relation to lifetime modelling of reinforced concrete structures. The influence of cement constitution on chloride binding is investigated by substituting cement with pure cement clinker. Both theoretical considerations and experimental data for chloride binding in cement pastes are presented. A physicochemical based model to describe the influence of temperature on physical binding of chloride is presented. Solid-state 27Al and 29Si magic-angle spinning nuclear magnetic resonance spectroscopy has been used for quantification of the anhydrous and hydrated aluminate and silicate phases in the chloride-exposed cement pastes. The 27Al isotropic chemical shift and nuclear quadrupole coupling is reported for a synthetic sample of Friedel's salt, Ca2Al(OH)6Cl·2H2O.

Publisher

Thomas Telford Ltd.

Subject

General Materials Science,Building and Construction

Reference13 articles.

1. Chloride attack of reinforced concrete: an overview

2. Tang L. Chloride Transport in Concrete—Measurement and Prediction. Dr thesis, 1996, Chalmers Technical University, Department of Building Materials, Publication P-96:6.

3. Direct observation of aluminium guest ions in the silicate phases of cement minerals by 27 Al MAS NMR spectroscopy

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