Why does PROFIS Engineering state invalid concrete strength when using 15N concrete. It seems the min it will accept is 25N. I am designing some tension anchors to be installed in a bridge deck. The concrete strength of the deck is unknown and DMRB guidance is to adopt 15N strength for this age of structure.
Thank you for your question regarding Profis Engineering. In brief the testing range for the EAD / ETA scope covers the common ranges of C20/25 to C50/60 (From the previous ETAG). With the introduction of EC2 Part 4 it has an expanded scope to C12/15 to C90/ 105 whilst the standard selection in the software is C12/15 to C50/60. It is also now possible to customise the concrete outside of the standard default range. Of course, depending upon your selected ‘Design Method’ within the software your chosen strength of concrete could be outside of that Design Approach criteria hence the warning message.