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Concrete carbonation prediction based on air-permeability tests with moisture compensation

机译：Concrete carbonation prediction based on air-permeability tests with moisture compensation

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Abstract Predicting carbonation resistance via early site tests is crucial for controlling the longevity and durability of concrete structures. Therefore, this study aimed to provide a nondestructive approach for predicting carbonation resistance utilizing in situ air-permeability and surface moisture measurements. The Torrent air-permeability method, coupled with surface moisture measurements by the electrical impedance method, was applied to 25 specimens produced using different cement types, water-to-binder ratios, and curing periods to obtain test data at various ages from 1 to 18?months; the carbonation depths were measured at 6, 12 and 18?months. To overcome the challenge of the moisture effect on measured values during the drying process, the kT5 indicator, permeability coefficient at the reference moisture of 5.0 was utilized. Strong correlations between kT5 and the carbonation rates were obtained that allowed the latter's prediction from tests of air-permeability and surface moisture performed at relatively early ages (e.g., 1 or 3?months). Guidance on the procedure is outlined.

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