THE USE OF CONDENSED SILICA FUME TO CONTROL ALKALI-SILICA REACTION - A FIELD CASE STUDY

In 1980 a sidewalk was built at Becancour, Quebec, with condensed silica fume concretes containing highly reactive aggregates. Eleven concrete mixes were used with cement quantities from 140 to 405 kg of cement per cubic m and condensed silica fume substitutions varying from 10 t0 40%. In spite of the great reactivity of the aggregates, the alkali-aggregate reaction is still under control. Microstructural studies of four particular concretes have been made after the first and third winters. No silicate gel has been observed in the two leaner mixes but some has been found in a few locations encircling coarse aggregate particles in the two richer mixes. The severe scaling problem observed in one of the concrete is characterized at the microstructure level by frequent unbonding of coarse aggregates and presence of converging cracks around the aggregates. (Author/TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00088846
• Corporate Authors:

  Pergamon Press, Incorporated

  Maxwell House, Fairview Park
  Elmsford, NY  United States  10523
• Authors:
  • Aitcin, P-C
  • Regourd, M
• Publication Date: 1985-7

Media Info

• Features: Photos; References; Tables;
• Pagination: p. 711-719
• Serial:
  • Cement and Concrete Research
  • Volume: 15
  • Issue Number: 4
  • Publisher: Elsevier
  • ISSN: 0008-8846
  • Serial URL: http://www.sciencedirect.com/science/journal/00088846

Subject/Index Terms

• TRT Terms: Admixtures; Aggregates; Alkali; Alkali aggregate reactions; Alkali silica reactions; Case studies; Chemical reactions; Chemical reactivity; Coarse aggregates; Concrete; Cracking; Fumes; Microstructure; Oxides; Rigid pavements; Silica; Silicon; Walkways
• Uncontrolled Terms: Concrete cracking
• Old TRIS Terms: Aggregate reactivity
• ITRD Terms: 4736: Admixture; 4577: Aggregate; 7353: Alkali; 5211: Cracking; 2720: Footway; 7372: Oxide; 7156: Reaction (chem); 2964: Rigid pavement; 7148: Silicon
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00452764
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Jul 31 1986 12:00AM