Abstract
This paper analyses the correlation function between the results of the time-consuming evaluation of chloride in concrete using the modified chloride penetration test and the significantly faster evaluation of the amount of chloride in the air using the dry plate method. Two in-situ locations in the Czech Republic were selected for long-term placement of samples, each with a highly different microclimate related to traffic intensity and different types of a bridge structure. Concrete samples were placed in-situ for 0.5, 1, 1.5, and 2 years of exposure. The dry plate method for obtaining the deposition rate of chloride was analysed each month and recalculated to the chlorides captured on the surface of the plate. There was good agreement in the amount of chloride increase in concrete and deposition plate during the winter, the increase of chlorides from de-icing agents, as well as a decrease in the summer period. In the measurements of concrete, the effect of chloride leaching from the upper layers was observed, even though the samples were partially hidden. The correlation found thus far needs to be verified in other locations in situ thus clarifying whether the dry plate method can fully replace the destructive examination of concrete structures.
Published Version
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