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Design concrete strength after 28 days: the value of kt

Eurocode 2 part 1-1: Design of concrete structures   3.1.2 (4)

If the concrete strength is determined at an age t > 28 days, the values αcc and αct defined in § 3.1.6 (1)P and § 3.1.6 (2)P should be reduced by a factor kt.


The recommended value of kt for the calculation of the concrete strength after 28 days is 0,85.

National choice