Abstract
The carbonation resistance of concrete coated with crystalline coating material (CCM) was experimentally investigated. Specimens with different water to binder ratios (0·4, 0·5, 0·6) and fly ash contents (0, 30%) with and without CCM coating were tested under an accelerated environment. It was found that carbonation resistance of concrete could be improved by coating with CCM. Carbonation depths of coated specimens were found to be lower than those of the uncoated specimens of the same mix proportion. The improved carbonation resistance was a result of both protection from the CCM coating layer and a reduction in the carbonation coefficient of the base concrete. When a CCM coating was applied to carbonated concrete, alkalisation (increase of pH) of the base concrete was observed. A mathematical approach to predict the carbonation depth of concrete with CCM coatings in different natural environments based on accelerated test results is also proposed.
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