To check slab quality, use this simple GC checklist:
1. Before Concrete Pour
Check:
Drawing
Slab thickness correct?
Beam/slab level correct?
Opening locations correct?
Formwork
Strong support, no movement
Level and slope correct
No gaps where concrete can leak
Rebar
Bar size and spacing follow drawing
Top bar and bottom bar are in correct position
Enough concrete cover
Chairs/spacers installed
Lapping length correct
Extra bars around openings and supports
MEP
Electrical conduit correct
Plumbing sleeves correct
No pipe cutting too much slab area
2. During Concrete Pour
Check:
Concrete quality
Concrete grade matches design
Slump test done
Cube/cylinder samples taken
Pouring method
Pour evenly
Do not drop concrete too high
Do not add too much water on site
Compaction
Use vibrator correctly
No honeycomb
No over-vibration
Level control
Check finished level
Check slope for toilet/balcony/drain area
3. After Concrete Pour
Check:
Curing
Start curing after finishing
Keep slab wet at least 7 days
Protect from sun and fast drying
Surface
No major cracks
No hollow area
No honeycomb
No ponding water problem
Strength
Check concrete test result
Do not remove support too early
Do not load materials too early
Simple site sentence
Good slab quality = correct rebar + strong formwork + good concrete + proper vibration + proper curing.