Abstract
Assessing the residual service life of carbonated reinforced concrete structures is typically conducted by measuring cover depths and carbonation of drilled cores, assuming the “square root law” for the progress of the carbonation front. Given the large spatial variability of carbonation depths, the required number of cores becomes prohibitive.A model is presented, based on numerous experimental data, by which the carbonation rate can be estimated by means of non-destructive site measurements of the air-permeability kT. A Weibull distribution of the carbonation rate Kc is fitted to the results, which is a function of kT.Hence, for each kT value measured on site coupled with the cover depth xd, expected, optimistic and pessimistic values of the corrosion initiation time can be obtained without the need of drilling cores. The method is validated on 111 paired results of kT and xd, obtained on the emblematic Tokyo's Museum of Western Art.
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