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Three classes of standard strength are included: class 32,5, class 42,5 and class 52,5
The strength classes are determined based on controlled testing with standard sand to assess the cement performance.
The 42,5R cement can be used to produce the same high strength concrete as the 52.5N strength class cement, as these 2 strength classes of cements are having similar 2day and 28day strength requirement as stated as table below.
Related Topic: Measurement of concrete strength