EFFECTS OF EXTERNALLY SUPPLIED LITHIUM ON THE SUPPRESSION OF ASR EXPANSION IN MORTARS

Lithium salts are being externally supplied for slowing the progress of deterioration of concrete structures undergoing alkali-silica reactions (ASR). However, it is not clear whether the sodium or potassium in the ASR gel in concrete is replaced by the lithium supplied from the outside. In this article, the authors reports on a study of the changes in the composition of the ASR gel, previously formed in mortar specimens, after they are immersed in LiOH solution. The study used backscattered electron (BSE) imaging and energy-dispersive X-ray (EDX) analysis. The authors hypothesize that the intrusion of lithium ions into mortar specimens containing a reactive aggregate could arrest their further expansion within a relatively short time after immersion in 0.50 N LiOH solution. The results show that the alkali ions incorporated in most ASR gels, located in the vicinity of the interfaces between the cement paste and reactive aggregate particles, appear to be replaced by the lithium ions supplied from the solution. However, the ASR gel within the reacted aggregate particles (which is far away from the interface with cement paste) is not affected by the lithium ions.

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  • Corporate Authors:

    Elsevier

    The Boulevard, Langford Lane
    Kidlington, Oxford  United Kingdom  OX5 1GB
  • Authors:
    • Kawamura, M
    • Kodera, T
  • Publication Date: 2005-3

Language

  • English

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  • Accession Number: 00989005
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 29 2005 12:00AM