n Journal of the South African Institution of Civil Engineers - An investigation of concrete curing practice in the Cape Town area : technical paper

Volume 38, Issue 1
  • ISSN : 1021-2019



The paper describes results from durability index tests used for the investigation of concrete curing practice in the Cape Town area. The object of the tests was to determine the effect that environmental conditions have on the physical properties of the outer skin (covercrete) of concrete and to assess the effectiveness of an on-site curing system.

Laboratory results showed that curing at 90 per cent relative humidity for 28 days had a beneficial effect on durability index values. Curing at 60 per cent relative humidity for 28 days was much less effective. The most effective practical curing method tested was the retained formwork method. The site work showed that the curing system tested on the median barrier was largely ineffective.

Die artikel beskryf die resultate van duursaamheidsindekstoetse wat gebruik is in 'n ondersoek van die betonpraktyk in en om Kaapstad. Die doel van die toetse was om te bepaal watter effek omgewingstoestande op die fisiese eienskappe van die buitenste laag beton en op die effektiwiteit van 'n betonnabehandelingstelsel het.

Laboratoriumresultate het bewys dat nabehandeling teen 'n relatiewe vogtigheid van 90 persent die 28-dae-duursaamheidsindekswaardes verbeter. Nabehandeling teen 'n relatiewe humiditeit van 60 persent vir 28 dae was heelwat meer oneffektief. Die mees effektiewe praktiese nabehandelingsmetode was waar die bekisting behou is. Die nabehandelingmiddels wat op die mediaanversperring gebruik is, was oneffektief.

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