👉The Main properties of concrete, explained clearly and simply:

🚧1. Workability

⏺How easy it is to mix, place, compact, and finish concrete.
Depends on water content, aggregates, admixtures, and temperature.
⏺High workability = easy to pour. Low workability = stiff concrete.

🚧2. Strength
Concrete mainly has:

⏺a) Compressive Strength
The most important property.
Concrete is very strong in compression (20–50 MPa or more).
⏺b) Tensile Strength
Concrete is weak in tension.
That is why we add reinforcement bars (rebar).
⏺c) Flexural Strength
Ability to resist bending forces.

🚧3. Durability

⏺Ability to resist weathering, chemicals, and abrasion.
⏺Good concrete lasts many years without major damage.

🚧4. Density

⏺Normal concrete density ≈ 2400 kg/m³.
⏺Depends on aggregates and mix design.
⏺Higher density improves strength.

🚧5. Permeability

⏺How easily water and chemicals pass through concrete.
⏺Good concrete should have low permeability to avoid corrosion of steel.

🚧6. Setting Time

⏺Time taken for concrete to start hardening.
⏺Initial setting: ~30 minutes–2 hours.
⏺Final setting: ~6–10 hours (varies with temperature & admixtures).

🚧7. Shrinkage

⏺Concrete shrinks when drying.
Leads to cracks if not controlled.
⏺Using proper curing reduces shrinkage.

🚧8. Creep

⏺Long-term deformation under continuous load.
⏺Concrete slowly bends or compresses over months/years.

🚧9. Thermal Expansion

⏺Concrete expands and contracts with temperature.
⏺Important when designing joints.

🚧10. Hardness

⏺Concrete becomes very hard after curing.
⏺Good resistance to wear on floors, pavements, and roads.

🚧11. Fire Resistance

⏺Concrete is non-combustible.
⏺Offers good fire protection due to slow heat transmission.

🚧12. Modulus of Elasticity

⏺Shows stiffness of concrete.
⏺Higher strength concrete = higher elasticity.

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