Minimum Steel for Crack Concrol?
Minimum Steel for Crack Concrol?
(OP)
Is there a minimum steel requirement for Temp. & Shinkage cracking in a residential slab on-grade (stemwall foundation)? In place of 6x6" 10/10 W.W.M., I would like to use #3 reinforcing bar grid but not sure of spacing?
Thanks
Thanks






RE: Minimum Steel for Crack Concrol?
DaveAtkins
RE: Minimum Steel for Crack Concrol?
A better way for residential construction is to add Fibermesh to the mix. Good crack control and no hassle of placing reinforcement.
RE: Minimum Steel for Crack Concrol?
If you are trying to reduce Temp. & Shinkage cracking i found the most common reasons for cracking were:
1. Excess water in the mix (no water added on site)
2. Rapid Drying or improperly curing concrete slabs (subs often want to pull forms the day of the pour, use a cureing top coating)
3. Lack of control joints.
4. sub grade must be prepared according to your soil conditions (I see all the time sites dumping truck after truck putting the fill in 3 ft lifts, limit to 8" compact between lifts)
RE: Minimum Steel for Crack Concrol?
I like #4 bars at 12" C/C each way. Workers can step in the open spaces without pushing the bars to the bottom of the slab. Put chairs at 36" max each way. Lap all joints. Stagger all joints.
RE: Minimum Steel for Crack Concrol?
I usually show a 6x6 w1.4xw1.4 reinforcing on 4" residential type basement slabs.