An attempt has been made to present a new model based on kinetics that can predict the expansion behaviors of mortar bars. The model incorporates the effects of factors such as size and reactivity of aggregates, alkalinity of the cement matrix, etc. In this work, at first, change of soluble silica content and alkali-silica ratio of reaction products with the passage of time are measured by a leaching test. The results obtained are then analyzed on the basis of kinetics in order to obtain alkali diffusion coefficients in aggregates. The expansion behaviors can be calculated by using these diffusion coefficient and alkali-silica ratio of reaction products. It is found that good agreement is observed in comparing the observed expansion behaviors with the calculated expansion behaviors in this way. Therefore, evaluating reactivity of the aggregates by using the model proposed here is useful to judge reactivity of aggregates quantitatively in short time. (A) For the covering abstract see IRRD 871351.


  • English

Media Info

  • Features: References;
  • Pagination: p. 1077-84

Subject/Index Terms

Filing Info

  • Accession Number: 00711165
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-946691-46-0
  • Files: ITRD
  • Created Date: Sep 20 1995 12:00AM