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Title: Mitigation of ASR by the use of LiNO{sub 3}—Characterization of the reaction products

The influence of the LiNO{sub 3} on the ASR product was studied both in a model system and in mortars. In the model system, the addition of LiNO{sub 3} decreases the dissolution rate and the solubility of silica. Lithium changes the 2-dimensional cross-linked (Q{sub 3} dominated) network of the ASR product into a less structured, Q{sub 2} dominated product, likely by adopting the role of calcium. In the mortar samples the addition of LiNO{sub 3} decreases expansion and significantly influences the chemical composition and the morphology of the reaction product. Lithium decreases the calcium, sodium and potassium content and changes the relatively porous plate-like reaction product into a dense one without texture. The findings in the mortars indicate that the ASR-suppressing effect of lithium is caused by the lower potential of the reaction product to swell. Furthermore, it forms a protective barrier after an initial reaction slowing down ASR. - Highlights: • Detection of lithium in ASR product by ToF-SIMS • Relation between composition of pore solution and ASR product • Identification of ASR suppressing mechanisms of LiNO{sub 3}.
Authors:
 [1] ;  [2] ; ; ;  [1] ;  [2]
  1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstr. 129, 8600 Dübendorf (Switzerland)
  2. Institute for Surface Science and Technology (D-MATL), ETH Zurich, Schafmattstr. 6, 8093 Zurich (Switzerland)
Publication Date:
OSTI Identifier:
22323138
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 59; 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; CALCIUM; CHEMICAL COMPOSITION; DETECTION; DISSOLUTION; LITHIUM; LITHIUM NITRATES; MASS SPECTROSCOPY; MICROSTRUCTURE; POROUS MATERIALS; POTASSIUM; SILICA