Concrete Strength (MPa)
- N20 (20MPa): Pathways, garden edges
- N25 (25MPa): Driveways, garage floors
- N32 (32MPa): Suspended slabs, structural
- N40+ (40MPa): Commercial, heavy duty
Common Applications
- House slab: N25 or N32
- Driveway: N25 minimum
- Footpath: N20-N25
- Pool surrounds: N25
- Retaining walls: N25-N32
Reinforcement
- Steel mesh (SL72, SL82): Slabs, driveways
- Rebar: Structural applications
- Fiber: Reduces surface cracking
Slump
Measures concrete workability:
- 80mm: Standard, general use
- 100mm: Easier to work
- 120mm: Pumped concrete
Additives
- Plasticizers: Better workability
- Accelerators: Faster setting
- Retarders: Slow setting (hot weather)
- Waterproofing: Reduced permeability