Forgot to show rebar design.

Actually went 9” on depth, #4 (1/2”) rebar is at 6” on center, 12” #4 rebar drilled 6” into existing slab perimeter and epoxied into holes. Left over rebar tied diagonally in corners. Rebar set at 6” depth will be out the way of drilling for 7” Hilti anchor drilling. Then 4500lb concrete with 1% non-chlorinated accelerator added. Then finished. Covered with insulated blankets to aid in concrete hydration (curing) for at least 7 days. At 7 days concrete will reach approximately 70% strength and posts can be set.

Actually went 9” on depth, #4 (1/2”) rebar is at 6” on center, 12” #4 rebar drilled 6” into existing slab perimeter and epoxied into holes. Left over rebar tied diagonally in corners. Rebar set at 6” depth will be out the way of drilling for 7” Hilti anchor drilling. Then 4500lb concrete with 1% non-chlorinated accelerator added. Then finished. Covered with insulated blankets to aid in concrete hydration (curing) for at least 7 days. At 7 days concrete will reach approximately 70% strength and posts can be set.