Effects of Crack Width on Carbonation Penetration: Implications for Crack-Dating

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Carbonation, a neutralizing reaction in cement paste, can be used to date cracks in cementitious materials. Currently, comparison between two cracks is the only method available to predict a relative age with carbonation. These two crack studies require a crack of known age in a similar material with similar exposure to the crack of unknown age. This thesis presents measurements of the extent of carbonation in cracks of varying width as a first step in laying a quantitative formulation for the use of carbonation in crack dating. This information will allow comparisons between two cracks of more similar exposure, but different crack width, which can expand the applicability of this dating method. Accelerated reaction rates were produced with a pure carbon dioxide environment and cement mixes with high contents of fly ash and are evaluated for economy and applicability. Relationships between carbonation penetration and crack width were established from these measurements.

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  • 08/14/2017
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