Thermogravimetric analysis (tga) of drillings at 5 mm depth intervals from a 36 year old in-situ concrete provided information on the steepness of the carbonation front for indoor and outdoor exposure. Tga results for indoor exposure suggested that the cement gel was fully carbonated to a depth of 45 mm but calcium hydroxide was present from 25 mm and increased to a maximum at a depth of 65 mm: a gradient covering 40 mm. For outdoor exposure the gradient extended over only 10 mm. Phenolphthalein measurements identified the first drill sample containing calcium hydroxide and showed neutralization depths of 26 and 38 mm for indoor and outdoor exposure respectively. The phenolphthalein results and the tga data for complete carbonation indicated that outdoor exposure was more severe but tga data for the deepest penetration of carbon dioxide suggested the reverse. It was recommended that service life studies of reinforced concrete structures should consider the steepness of the carbonation front.(a)

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  • Corporate Authors:

    Pergamon Press, Incorporated

    Maxwell House, Fairview Park
    Elmsford, NY  United States  10523
  • Authors:
    • Parrot, L J
    • Killoh, D C
  • Publication Date: 1989-7


  • English

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Filing Info

  • Accession Number: 00498624
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Sep 30 1990 12:00AM