However when using a CEM III/B type of cement, (see Figure 4.3b), the reliability index is reduced by 50% and is far below the reliability index proposed for this environmental class. An additional reduction of the concrete cover means a further reduction of the reliability index.
The considerable difference in reliability index as a consequence of using two types of cements shows that the currently existing requirements for the determination of the concrete cover do not include all important parameters and are therefore not very exact. For a nominal concrete cover of 40 mm, the model seems to put in evidence that the deviation of the proposed reliability index is still acceptable, whereas a nominal concrete cover of 35 mm leads to an unacceptable decrease of total life time.
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