Effective Creep Ratio

Depending on the assumptions used in the design, it may be necessary to determine the effective creep ratio Hef (ref. CI. 3.1.4 & 5.8.4). A nomogram is provided in the Eurocode (Figure 3.1) for which the cement strength class is required; however, at the design stage it often not certain which class applies. Generally, Class R should be assumed. Where the ground granulated blastfurnace slag (ggbs) exceeds 35% of the cement combination or where pulverized fuel ash (pfa) exceeds 20% of the cement combination, Class N may be assumed. Where ggbs exceeds 65% or where pfa exceeds 35%, Class S may be assumed.

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