BENT BAR IDENTIFICATION

[Nitsugua]

We are curently evaluating a 1958 concrete floor. So far, I'm not old anough to understand original drawings. My question is about bent rebars and there identification.

Even with a hook or any othe king of bendig, there is a code I dont understand. For exemple, bottom bars (positive renforcement) in a beem are noted: 2-MK810

other examples 2-MK706 , 2-MK911.

Is there an old book showing bending standars with numbers?
What is the size of the bar in MK810, #8?

thanks

Luc Perron, eng

Luc Perron, engineer
Unigec Experts-conseils

 

[WillisV]

MK probably stands for Mark - as in a reinforcing schedule which would have the Mark number (MK706) and the reinforcing diameter, length, bends, etc.

 

[Lutfi]

I second Willis's guess.

Regards,
Lutfi

 

[PMR06]

We've detailed the rebar for some of our jobs. You are correct, MK is "mark" and the first digit following MK is the bar size (i.e. MK810 is a #8, MK501 is #5, etc). The only standard MK we use is for the first bar in a size, MK401, MK501, etc. They are typically right angle corner bars, with equal legs, usually the standard lap length rounded up to nearest 3". That may not be a universal standard though. You'll probably need the bend diagrams or schedule from the original drawings to know what the bent bars actually are.