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Investigation and Modelling of Concrete Carbonation

By Markéta Rovnaníková

Abstract

The corrosion of steel reinforcement is probably the most frequent type of degradation of reinforced concrete structures. Reinforcing bars are protected from corrosion by a thin iron oxide layer which is formed on their surface due to a high alkalinity of the surrounding concrete. Corrosion may start when this layer is destroyed (i) either by chloride ion penetration (when the concentration of dissolved chloride at the depth of the reinforcing steel exceeds a critical value) or (ii) by a reduction in the pH value of pore solution to values below 9.5. Such a reduction in alkalinity is the result of carbonation of the Ca(OH)2 in the concrete mass, i.e. of its reaction with the atmospheric CO2. The main aim of this work is an experimental investigation and modelling of carbonation process. The effect of relative humidity, curing period and replacement of Portland cement by supplementary cementing materials (SCM - fly ash, blast furnace slag and metakaolin) on carbonation process has been studied. Calcium hydroxide content in the presence of SCM and their pozzolanic activities have been also determined. Furthermore, lots of parametric studies and comparison of carbonation models have been provided. The software tools based on the introduced models and considering the input data to be statistically independent random variables have been described and used for other parametric studies

Topics: beton; Karbonatace; obsah hydroxidu vápenatého; modelling.; modelování.; pucolánová aktivita; concrete; příměs; supplementary cementing material; pozzolanic activity; Carbonation; calcium hydroxide content
Publisher: Vysoké učení technické v Brně. Fakulta chemická
Year: 2012
OAI identifier: oai:invenio.nusl.cz:233351
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