Validation of the alkali contribution by aggregates to the concrete pore solution

Mortar and concrete specimens were made with six reactive and non-reactive aggregates from Eastern Canada, with different alkali contents, to determine their alkali contribution to the pore solution. Two methods were used to determine the alkali content of samples over time: the high pressure extraction method and the espresso extraction method. Also, an alkali leaching test was conducted directly on the same aggregate materials. One aggregate was clearly identified as a potential source of Na+ to the pore solution. Results obtained after one year at 60 °C showed that rich alkali-bearing aggregates, which can be identified in an alkali leaching test by immersion in alkaline solutions, can release up to 1.75 kg Na₂O/m³ of concrete if used as fine fraction and up to 0.24 kg Na₂O/m³ of concrete if used as coarse fraction. However, no clear K+ contribution from aggregate was observed.

• Record URL:
  https://doi.org/10.1016/j.cemconres.2017.04.001
• Record URL:
  http://www.sciencedirect.com/science/article/pii/S0008884617301898
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00088846
• Supplemental Notes:
  • Abstract reprinted with permission from Elsevier.
• Authors:
  • Drolet, Cédric
  • Duchesne, Josée
  • Fournier, Benoît
• Publication Date: 2017-8

Language

• English

Media Info

• Media Type: Web
• Features: Figures; Photos; References; Tables;
• Pagination: pp 10-23
• Serial:
  • Cement and Concrete Research
  • Volume: 98
  • Publisher: Elsevier
  • ISSN: 0008-8846
  • Serial URL: http://www.sciencedirect.com/science/journal/00088846

Subject/Index Terms

• TRT Terms: Aggregates; Alkali; Alkali aggregate reactions; Concrete; Mortar
• Uncontrolled Terms: Alkali content; Pore solution
• Geographic Terms: Canada
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 01637929
• Record Type: Publication
• Files: TRIS
• Created Date: May 16 2017 4:41PM