PRACTICAL CONCRETE PETROGRAPHY

The important practical aspects of concrete petrography are reviewed. Examples are given of its use as an analytical tool to detect the cause of concrete deterioration; the authors suggest that the method should be used as a routine in the development of sound concrete. The technique described is primarily the study of thin microscopical sections under incident and polarised light. Aggregates should be analysed to assess their suitability before use. The cement phases which occur can be identified in polished specimens and etchants can be used to emphasise mineral phases. Illustrations are given of the techniques used to identify portlandite in drying and leaching. The contributions of ettringite to severe micro-cracking can be examined. The use of cross-polarised light to show carbonation of the cement paste is discussed. The effect of calcium chloride on the corrosion of steel reinforcement can also be examined using cross-polarised light. Alkali hyrolysis of potassium bearing minerals can also be studied. /TRRL/

  • Availability:
  • Corporate Authors:

    Cement and Concrete Association

    Wexham Spring
    Slough SL3 6PL, Buckinghamshire,   England 
  • Authors:
    • Power, T O
    • HAMMERSLEY, G P
  • Publication Date: 1978-8

Language

  • English

Media Info

  • Features: Photos;
  • Pagination: p. 27-31
  • Serial:
    • CONCRETE
    • Volume: 12
    • Issue Number: 8
    • Publisher: THE CONCRETE SOCIETY
    • ISSN: 0010-5317

Subject/Index Terms

Filing Info

  • Accession Number: 00188302
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Mar 28 1979 12:00AM