bent bar identification

huangyhg

bent bar identification
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
mk probably stands for mark - as in a reinforcing schedule which would have the mark number (mk706) and the reinforcing diameter, length, bends, etc.  
i second willis's guess.
regards,
lutfi
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.