THE KINGSTON, ONTARIO EXPOSURE SITE FOR EFFECTIVENESS OF PREVENTIVE MEASURES FOR ALKALI-SILICA REACTION

The selection of measures to prevent alkali-silica reaction in concrete requires confidence that the selected measure will work over the life of the structure. It is crucial that the results of short-term laboratory tests be correlated to long-term performance of concrete in structures. An outdoor exposure site was established in Kingston, Ontario in 1991. Beams and pavement slabs on grade were cast with Spratt reactive aggregate and various cementing materials. The expansion of the beams and slabs has been measured for nine years and correlated with laboratory expansion of mortar bars and concrete prisms. The concrete made with high-alkali cement cracked at an age of five years. Where various amounts of supplementary cementing materials were used, expansion has been considerably less and only very minor cracking has occurred. The following materials have been shown to be more or less effective: 50% and 25% ground granulated blast-furnace slag, 18% type F fly ash, and low-alkali cement (< 0.6% Na2Oe). The most effective measure that also had adequate freeze-thaw scaling resistance was a ternary blend of 25% slag and 3.8% silica fume interground in a high-alkali Portland cement.

• Supplemental Notes:
  • Full conference proceedings available on CD-ROM.
• Corporate Authors:

  University of Texas, Austin

  International Center for Aggregates Research, 3208 Red River
  Austin, TX  United States  78705-2650

  Texas A&M University, College Station

  Faculty Exchange Box H
  College Station, TX  United States  77843
• Authors:
  • Rogers, C
  • Lane, B
  • Hooton, D
• Conference:
  • International Center for Aggregates Research 9th Annual Symposium: Aggregates - Concrete, Bases and Fines
  • Location: Austin, Texas
  • Date: 2001-4-22 to 2001-4-25
• Publication Date: 2001

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: 18p

Subject/Index Terms

• TRT Terms: Alkali; Alkali silica reactions; Beams; Cement; Concrete structures; Expansion; Fly ash; Freeze thaw durability; Granulated slag; Laboratory tests; Mortar; Performance; Portland cement; Prevention; Prisms; Reactive aggregates; Silica fume; Slab on grade
• Geographic Terms: Kingston (Canada)
• Subject Areas: Highways; Materials; Security and Emergencies; I32: Concrete;

Filing Info

• Accession Number: 00983580
• Record Type: Publication
• Report/Paper Numbers: Final Draft
• Files: TRIS
• Created Date: Dec 27 2004 12:00AM