REACTIONS BETWEEN DOLOMITIC AGGREGATE AND ALKALI-PORE FLUIDS IN CONCRETE

Carbonate aggregates will react with alkalies from the cement paste in concretes under certain conditions. Several types of reaction are possible, and one involving dolomitic aggregates which contain intergranular clays can lead to disruptive expansion in the concrete. This reaction of dolomite with cement alkalies is essentially one of dedolomitization, a complex reaction rim containing three recognizable zones develops at the interface between the cement paste and aggregate. The details of the reaction processes and of ionic migration with time have been followed using electron probe microanalysis. The effect of the presence of additional alkalies and of sodium chloride on the reaction processes and speed are also discussed on the basis of microanalytical data. (Author/TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/04812085
• Corporate Authors:

  GEOLOGICAL SOCIETY

  BURLINGTON HOUSE, PICCADILLY
  LONDON,   United Kingdom  W1V 0JU
• Authors:
  • Poole, A B
  • Sotiropoulos, P
• Publication Date: 1980

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 281-287
• Serial:
  • QUARTERLY JOURNAL OF ENGINEERING GEOLOGY
  • Volume: 13
  • Issue Number: 4
  • Publisher: GEOLOGICAL SOCIETY
  • ISSN: 0481-2085

Subject/Index Terms

• TRT Terms: Aggregates; Alkali; Alkali aggregate reactions; Cement paste; Chemical reactions; Clay; Concrete; Dolomite; Expansion; Interfaces; Porosity; Sodium chloride
• Old TRIS Terms: Alkalies
• ITRD Terms: 4577: Aggregate; 7353: Alkali; 4767: Cement paste; 4177: Clay; 4755: Concrete; 4191: Dolomite; 6720: Expansion; 5429: Interface; 5938: Porosity; 7156: Reaction (chem); 7316: Sodium chloride
• Subject Areas: Geotechnology; Highways; Materials; Planning and Forecasting; I32: Concrete; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00335231
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Oct 28 1981 12:00AM