STUDIES OF ALKALI-SILICA REACTION. PART 5. VERIFICATION OF A NEWLY PROPOSED REACTION MECHANISM

To explain the roles of ca(oh)2 and alkali chlorides in alkali-silica reaction, it has been proposed that during the chemical reaction alkali and hydroxyl ions enter the reactive silica grains leaving behind ca and chloride ions in the liquid phase. This postulated reaction has been verified by estimating calcium ions and hydroxide ions in the liquid phase of the system reactive silica-ca(oh)2-alkali chloride water. The results of this investigation indicate that other things being constant the rate of alkali-silica reaction is determined by the size of the hydrated alkali ion; the larger the size the lower is the rate of reaction. It seems that the reactivity of an aggregate may be evaluated in a cement-free system. The results suggest that the alkali-silica reactivity of an aggregate could be evaluated simply by measuring hydroxide ion concentration in the system: reactive sand-ca(oh)2-saturated alkali chloride solution and comparing it with that of the system: quartz sand-ca(oh)2-saturated alkali chloride solution. (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:
  • Chatterji, S
  • Thaulow, N
  • Jensen, A D
• Publication Date: 1989-3

Media Info

• Features: References;
• Pagination: p. 177-183
• Serial:
  • Cement and Concrete Research
  • Volume: 19
  • Issue Number: 2
  • Publisher: Elsevier
  • ISSN: 0008-8846
  • Serial URL: http://www.sciencedirect.com/science/journal/00088846

Subject/Index Terms

• TRT Terms: Aggregates; Alkali; Calcium; Chemical reactions; Chlorides; Concrete; Durability; Hydroxides; Oxides; Silicon
• ITRD Terms: 4577: Aggregate; 7353: Alkali; 7178: Calcium; 4755: Concrete; 5910: Durability; 7314: Halide; 7354: Hydroxide; 7372: Oxide; 7156: Reaction (chem); 7148: Silicon
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00493512
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Apr 30 1990 12:00AM