By Carmen Andrade (auth.), Carmen Andrade, Joost Gulikers (eds.)
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Extra resources for Advances in Modeling Concrete Service Life: Proceedings of 4th International RILEM PhD Workshop held in Madrid, Spain, November19, 2010
RH-INT is the most relevant limiting factor. Icorr values fluctuate considerably, either in outdoor an indoor specimens. In order to study corrosion behavior over large periods of time the accumulated corrosion rate is a much better alternative way of visualizing the deterioration process. Corrosion seems to develop differently after a certain level of cracking has been reached. It attenuates with time due to the increase of the concrete resistivity and possible more dry conditions when cracking favours it.
It also enables the calculation of the residual bar cross section, either homogenously distributed or as localized attack. – The addition of nitrite has a beneficial effect on the corrosion behavior of steel, as it results in a delay of the depassivation time and a significant reduction From corrosion rate to accumulated corrosion depth 51 of the corrosion rate. The use of galvanized generates a similar behavior by significantly reducing the losses in steel section. – As it was to be expected, the binder content and the w/c ratio are also determinant parameters in order to reduce the initial pitting corrosion.
No direct relation between RH and Icorr was observed. F. Pedrosa (*) • C. es C. Andrade and J. 1007/978-94-007-2703-8_4, © RILEM 2012 33 34 1 F. Pedrosa and C. Andrade Introduction DEGREE OF CORROSION There are several theories and models in order to predict the service life of corroding structures . One of the most generally accepted is the conceptual model presented by Tuutti , as illustrated in Figure 1, that basically describes two periods, a first one of initiation in which external aggressive agents enter the concrete triggering the deterioration process, and a second one, of propagation, in which this deterioration continues until reaching an unacceptable degree of corrosion.