FUNDAMENTAL CONCRETE CARBONATION MODEL AND APPLICATION TO DURABILITY OF REINFORCED CONCRETE . DURABILITY OF BUILDING MATERIALS AND COMPONENTS. PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE HELD IN BRIGHTON, NOVEMBER 7-9, 1990

In reinforced concrete carbonation of concrete leads to depassivation of the reinforcing bars, and hence to initiation of corrosion. In this paper, the physicochemical processes of concrete carbonation are modeled mathematically. For the usual range of parameter values, the resulting complex mathematical model can be simplified, yielding a carbonation front and the rate at which this front advances within the concrete volume. This rate is expressed in terms of the effective diffusivity of carbon dioxide (CO2) in concrete, the molar concentrations of calcium hydroxide Ca(OH)2 and calcium silicate hydrate (CSH) in concrete, and the ambient concentration of CO2. The model is verified experimentally, by comparison with the results of normal and accelerated carbonation tests, and then used to perform parametric studies on the effect of various composition parameters (water-cement and aggregate-cement ratios, chemical composition and type of cement) and of the ambient relative humidity and CO2 concentration on the corrosion initiation period for given concrete cover. (Author/TRRL)

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  • Corporate Authors:

    E and F Spon Limited

    2-6 Boundary Road
    London,   England 
  • Authors:
    • Papadakis, V G
    • Fardis, M N
    • Vayenas, C G
  • Publication Date: 1991

Language

  • English

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Filing Info

  • Accession Number: 00617494
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • ISBN: 0-419-15480-9
  • Files: ITRD, TRIS
  • Created Date: Nov 30 1992 12:00AM