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N50 is 'normal-class' and withstands 50MPa after 28 days of curing.

S50 is 'special class' and also withstands 50MPa after 28 days however ay have other properties or require more specific stregth characteristics eg

S, for compressive strength grades;

SF, for flexural strength grades; or

ST, for indirect-tensile strength grades.

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Q: What is the difference between N50 and S50 concrete grade?
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