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Unless otherwise stated, the cement type in concrete is assumed not to affect the concrete’s 28 day design strength. However the strength development of concrete before and after 28 days is significantly affected by the type of cement. The concrete supplier should be able to provide indicative concrete strength data at various ages on request.
For design purposes, prior to a supplier being known, BS EN 1992-1-1, Eurocode 2: Design for concrete structures, sub-clause 31.2(6) gives an expression for the development of mean concrete strength at 20C at a particular age t in days for specimens cured in accordance with BS EN 12390, see below.
The coefficient s depends on the cement type;
Acknowledgement: Concrete Society