KINETICS AND MICROSTRUCTURAL CHANGES ASSOCIATED WITH MORTAR EXPANSION

Mortar expansion data have been fitted to various kinetic models. The expansion tests utilized several aggregates (Pyrex glass, Vycor glass, calcined flint, Spratt's aggregate, and Beltane opal) and cements with various alkali contents. A very good fit was observed using a model developed to describe autocatalytic chemical reactions, and a fairly good fit was observed using a model for topochemical reactions. Microstructural studies showed that the reaction of Pyrex and Vycor involved highly localized attack of the glass, while reaction of calcined flint was less localized and appeared to be associated with preexisting internal fractures. For all three aggregates, the mortar expansion appeared to be associated with expansion of individual aggregate particles.

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  • Supplemental Notes:
    • This paper was presented at an American Society for Testing and Materials (ASTM) Committees C01 and C09 Symposium on Developments in Test Methods for Alkali-Silica Reaction held in December 1998 in Nashville, Tennessee. This research was funded in part through the Institute for Standards Research and in part by the National Science Foundation (Grant No. MSS-9114313).
  • Corporate Authors:

    American Society for Testing and Materials (ASTM)

    100 Barr Harbor Drive, P.O. Box C700
    West Conshohocken, PA  United States  19428-2957
  • Authors:
    • Pade, C
    • Struble, L J
  • Publication Date: 2000-6

Language

  • English

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Filing Info

  • Accession Number: 00794134
  • Record Type: Publication
  • Contract Numbers: AR-14-20, MSS-9114313
  • Files: TRIS
  • Created Date: Jun 28 2000 12:00AM