1887

n Journal of the South African Institution of Civil Engineers - Long-term carbonation of concrete structures in the Johannesburg environment : technical paper

Volume 38, Issue 1
  • ISSN : 1021-2019
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Abstract

This paper presents and discusses the results of a survey of long-term carbonation of concrete structures in the greater Johannesburg area. The warm, semiarid climate of this region of the country favours carbonation. The investigation focused on 10 major bridge structures ranging from 19 to 30 years in age and forming part of the city motorway system. Cores were drilled and tested for carbonation depth, oxygen permeability and water sorptivity. Results of the survey indicated that carbonation generally progressed rapidly, having already reached the depth of reinforcing in at least five structures. Notwithstanding this, there is little visual evidence of steel corrosion. It is concluded that, in spite of fairly rapid carbonation rates, the likelihood of extensive corrosion is small.

Hierdie referaat bied aan en bespreek die resultate van 'n ondersoek na die langtermyneffek van karbonering op betonstrukture in die Groter-Johannesburg gebied. In hierdie gebied bevorder die warm, semi-dorre klimaat karbonering. Die ondersoek het gefokus op 10 swaar brugstrukture wat tussen 19 en 30 jaar oud is en deel uitmaak van die stedelike padstelsel. Kerne is geboor en getoets vir karboneringsdiepte, suurstofdeurlaatendheid en sorptiwiteit. Die inligting wat bekom is, dui aan dat die karboneringsproses vinnig vorder en reeds tot die betonbewapening van ten minste vyf strukture deurgedring het. Ondanks hierdie feit is geen aanduidings van sigbare korrosie gevind nie. Daar is tot die gevolgtrekking gekom dat, ten spyte van die redelike vinnige karboneringstempo, die waarskynlikheid van uitgebreide korrosie skraal is.

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/content/civileng1/38/1/EJC26777
1996-01-01
2016-12-11

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