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35N/mm2

actually, the '35' respresents the characteristic design strength of the concrete. this strength is pivotal in design as its the 'lowest fair estimate' of strength.in reality tere is a margin for error (between 5-10MPa)and a 5% defectives built in to a normal probability curve.in my latest research i have found that in some cases the characteristic design strength (in your case 35MPa) can almost be underestimated by 20%.the importance is on-site testing, but as previously stated, if you design to 35MPa... you are definitely on the safe side of concretes inevitable variability

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