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Title: ASR prevention — Effect of aluminum and lithium ions on the reaction products

In spite of the recent progress in the understanding of the mechanisms enabling aluminum-containing SCM like metakaolin and added LiNO{sub 3} to limit the extent of ASR in mortar and concrete, some gaps still remain. They concern mainly the effect of aluminum-containing SCM on the formed ASR products and the influence of aggregate characteristics on the effectiveness of LiNO{sub 3}. In this study, a model system, concrete and mortar were investigated by pore solution analysis, TGA, XRD, NMR, SEM combined with EDX and ToF-SIMS to address these questions. The amount of aluminum present in the pore solution of concrete and mortar is only able to slow down SiO{sub 2} dissolution but not to alter morphology, structure and composition of the reaction products. LiNO{sub 3} can suppress ASR by forming dense products protecting reactive minerals from further reaction. But its effectiveness is decreasing with increasing specific surface area of the reactive minerals in aggregates. - Highlights: • Aluminum of SCM slows down SiO{sub 2} dissolution. • Aluminum of SCM does not alter morphology and structure of ASR product. • ASR suppressing effect of LiNO{sub 3} depends on specific surface area of the aggregates.
Authors:
 [1] ;  [2] ; ;  [1]
  1. Laboratory for Concrete/Construction Chemistry, Empa, Swiss Federal Laboratories for Material Science and Technology, Überlandstr. 129, 8600 Dübendorf (Switzerland)
  2. Laboratory for Nanoscale Materials Science, Empa, Swiss Federal Laboratories for Material Science and Technology, Überlandstr. 129, 8600 Dübendorf (Switzerland)
Publication Date:
OSTI Identifier:
22475528
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 76; Other Information: Copyright (c) 2015 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; CONCRETES; DISSOLUTION; ION MICROPROBE ANALYSIS; LITHIUM IONS; LITHIUM NITRATES; MASS SPECTROSCOPY; MORPHOLOGY; MORTARS; NMR SPECTRA; NUCLEAR MAGNETIC RESONANCE; SCANNING ELECTRON MICROSCOPY; SILICA; SILICON OXIDES; SPECIFIC SURFACE AREA; THERMAL GRAVIMETRIC ANALYSIS; X-RAY DIFFRACTION; X-RAY SPECTROSCOPY