Different methods to measure the carbonation profiles in concrete

Author(s): G. Villain, M. Thiery, V. Baroghel-Bouny, G. Platret
Paper category: Workshop
Book title: International RILEM Workshop on Performance Based Evaluation and Indicators for Concrete Durability
Editor(s): V. Baroghel-Bouny, C. Andrade, R. Torrent, K. Scrivener
ISBN: 978-2-912143-95-2
Pages: 89 - 98
Total Pages: 10
Language: English

The performance-based approaches consist in evaluating the appropriate durability indicators, in developing models to predict the structure service life and in validating the models with the results of the concrete degradations such as chloride ingress or carbonation. In this paper different methods are proposed to measure carbonation profiles in concrete.
Gammadensimetry is a rapid, convenient, non-destructive method to monitor the carbonation process during the accelerated test in laboratory. This method is based on the mass increase due to the penetration and fixation of carbon dioxide (CO₂). It measures the CO₂ quantity penetrated into concrete. A second method combines thermogravimetric and chemical analysis (TGA-CA); it has the advantage to give the cement content of the small sample taken from a concrete structure. Thus, TGA-CA enables to quantify the CO₂, which has reacted with the hydrates of the cementitious material.
The results, obtained on various concrete mixes after accelerated carbonation or natural carbonation on site, are analysed by taking into account the durability indicators. The measured profiles are compared to each other and to classical phenolphthalein spraying tests. Finally, these experimental monitoring parameters are used to validate the carbonation profiles calculated by the prediction model developed in our laboratory.

Online publication: 2007
Publication Type: full_text
Public price (Euros): 0.00

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