👉Properties of Concrete
1️⃣ What is Concrete?
Concrete is a composite material made of:
- Cement (binder)
- Aggregates (fine and coarse)
- Water
- Admixtures (optional)
2️⃣ Important Properties of Concrete:
- Workability: Ease of mixing, placing, and finishing.
- Strength: Ability to resist loads — mainly compressive strength.
- Durability: Ability to withstand weathering, chemical attack, abrasion.
- Shrinkage: Volume reduction during drying.
- Creep: Long-term deformation under sustained load.
3️⃣ Grades of Concrete (IS 456:2000 Standard Example):
- M20 → 20 MPa strength (commonly used for residential buildings)
- M30, M40, M50 → Higher strength for infrastructure, bridges, high-rise.
4️⃣ Factors Affecting Concrete Strength:
- Water-cement ratio (lower ratio = higher strength)
- Quality of materials
- Curing methods
- Mixing procedures
5️⃣ Curing of Concrete:
- Maintains moisture for proper strength gain.
- Methods: Water curing, steam curing, curing compounds.
2August 10, 2026 545 1
