Rebar spacing requirements for exterior exposure
Rebar spacing requirements for exterior exposure
(OP)
Just curious, are we strictly follow the rebar spacing requirements for exterior exposure requirements as per code.
We have an open parking garage flat slab structure and need to know, whether i have to check this structure for rebar spacing requirements for crack control.
I am well above the cracking moment, but does it meant i have no need to check cracking. Is that requirement for interior or exterior or just basic crack control requirements. If i go for exterior exposure, i can't place my rebars farther than 6" spacing, but normally 12" spacing works well for us.
We have an open parking garage flat slab structure and need to know, whether i have to check this structure for rebar spacing requirements for crack control.
I am well above the cracking moment, but does it meant i have no need to check cracking. Is that requirement for interior or exterior or just basic crack control requirements. If i go for exterior exposure, i can't place my rebars farther than 6" spacing, but normally 12" spacing works well for us.






RE: Rebar spacing requirements for exterior exposure
RE: Rebar spacing requirements for exterior exposure
Although from calculations, it is ideal to have smaller rebars for better crack control.
RE: Rebar spacing requirements for exterior exposure
Closer spacing minimizes the number and width of crack, in turn, it helps to provent corrosion due to leakage. I am not expert on concrete paving subjects to aggressive weather & chemical assults, but I think better concrete mix design, in conjunction with surface protective covering should be in your interest list. Also, how about increase concrete cover, however, ignore the extra thickness in crack control cal, otherwise you would be penalized for it, which does not make sense.
RE: Rebar spacing requirements for exterior exposure
RE: Rebar spacing requirements for exterior exposure
I have explained the phenonmenon in one of the thread. From our past dealing with USCOE for mass concrete structures, for which 4" or more cover was common place, if follow ACI without adjustment, yes, the reinforcing would be a killer of the projects. It was finally agreed/accepted, that any cover beyond the 2" used in the development of the ACI method was considered EXTRA (non-structural), thus ignored in the calculation.
RE: Rebar spacing requirements for exterior exposure