skip to main content

SciTech ConnectSciTech Connect

Title: Friedel's salt formation in sulfoaluminate cements: A combined XRD and {sup 27}Al MAS NMR study

Four different binders based on calcium sulfoaluminate cements have been submitted to accelerated chlorination through ionic exchange on hydrated pastes, in order to investigate their ability to chemically bind chloride ions that might reduce chloride penetration. The composition of hydrated cements before and after the treatment was evaluated by means of an X-Ray Diffraction–{sup 27}Al Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy combined study, allowing to take into account even partially amorphous phases and to make quantitative assumption on the relative abundance of the different aluminium-containing phases. It was found that low SO{sub 3} Sulfoaluminate–Portland ternary systems are the most effective in binding chloride ions and the active role played by different members of the AFm family in chloride uptake was confirmed. Moreover, a peculiar behavior related to the formation of Friedel's salt in different pH conditions was also established for the different cements.
Authors:
 [1] ;  [1] ; ;  [2] ;  [2]
  1. Dipartimento di Scienze ed Innovazione Tecnologica, Università del Piemonte Orientale A. Avogadro, Viale T. Michel 11, 15121 Alessandria (Italy)
  2. Buzzi Unicem S.p.A., Via L. Buzzi 6, 15033 Casale Monferrato (Italy)
Publication Date:
OSTI Identifier:
22395938
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 67; 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; ALUMINIUM; AMORPHOUS STATE; ATOMIC FORCE MICROSCOPY; CALCIUM; CEMENTS; CHLORIDES; CHLORINATION; CHLORINE IONS; NUCLEAR MAGNETIC RESONANCE; PH VALUE; SALTS; SPECTROSCOPY; SULFITES; UPTAKE; X-RAY DIFFRACTION