Types of Concrete in Concrete Technology | Civil Engineering Guide for JKSSB -

Updated for 2025 | Useful for JKSSB JE Civil, AE, SSC JE, RRB & Other State Exams

📌 Introduction

Concrete is the most commonly used construction material worldwide due to its versatility, strength, and durability. It is made from cement, water, fine aggregates, and coarse aggregates, but depending on specific applications, different types of concrete are developed to meet varying structural and environmental demands.

This guide helps JKSSB Civil aspirants understand the types of concrete, their composition, uses, and features.

📚 Why This Topic Matters for JKSSB?

Frequently asked in JKSSB JE Civil and AE Civil exams
Conceptual clarity helps in interview and practical fieldwork
Helpful for questions in SSC JE, RRB JE, and other state-level exams

🏗️ Types of Concrete (Detailed Explanation)

1. Plain Cement Concrete (PCC)

Composition: Cement + Sand + Coarse Aggregate + Water (no reinforcement)
Use: Flooring, levelling, foundation beds
Features: High compressive strength, no tensile strength
Advantages: Simple, economical
Disadvantages: Weak in tension

2. Reinforced Cement Concrete (RCC)

Composition: PCC + Reinforcing Steel Bars (Rebars)
Use: Beams, slabs, columns
Features: Resists compression and tension
Advantages: Durable, strong
Disadvantages: Costlier, needs skilled labor

3. Prestressed Concrete

Composition: RCC + Pre-tensioned/Post-tensioned Steel
Use: Bridges, flyovers
Features: Handles high loads, crack resistant
Advantages: Longer spans possible
Disadvantages: Expensive, complex

4. Precast Concrete

Cast Off-Site in a controlled environment
Use: Slabs, poles, manholes
Advantages: Quality control, fast erection
Disadvantages: Transport required

5. Ready-Mix Concrete (RMC)

Pre-batched and mixed at plant
Use: Large-scale construction
Advantages: Consistent quality
Disadvantages: Transport delays can cause setting

6. High Strength Concrete

Strength: > 40 MPa
Use: High-rise buildings, bridges
Advantages: Durable, allows thinner sections
Disadvantages: Costlier

7. High Performance Concrete (HPC)

Enhanced properties: Strength, workability, durability
Use: Marine structures, nuclear plants
Advantages: Long life, high performance
Disadvantages: Complex mix

8. Self-Compacting Concrete (SCC)

Flows under its own weight
Use: Dense reinforcement areas
Advantages: Time-saving, no vibration needed
Disadvantages: Costly

9. Fibre Reinforced Concrete (FRC)

Fibres: Steel, glass, synthetic
Use: Industrial floors, runways
Advantages: Crack resistant
Disadvantages: Requires careful mixing

10. Lightweight Concrete

Lightweight Aggregates: Pumice, vermiculite
Use: Roof insulation, partitions
Advantages: Reduced dead load
Disadvantages: Lower strength

11. Air-Entrained Concrete

Entrained air bubbles
Use: Pavements in cold areas
Advantages: Freeze-thaw resistance
Disadvantages: Slightly reduced strength

12. Pervious or Porous Concrete

No fine aggregates
Use: Sidewalks, eco-friendly parks
Advantages: Allows water seepage
Disadvantages: Clogging issues

13. Vacuum Concrete

Excess water removed using vacuum
Use: Bridge decks, industrial floors
Advantages: High early strength
Disadvantages: Needs equipment

14. Shotcrete

Sprayed concrete
Use: Tunnels, pools, slopes
Advantages: No formwork needed
Disadvantages: Dusty, needs skilled labor

15. Polymer Concrete

Uses polymer resins instead of cement
Use: Sewer pipes, acid tanks
Advantages: Chemical resistance, fast setting
Disadvantages: Costly

📊 Summary Table

Type	Key Feature	Common Use
PCC	No reinforcement	Flooring, foundations
RCC	Reinforced with steel	Slabs, beams, columns
Prestressed	Pre/Post tensioned steel	Bridges, flyovers
Precast	Factory-cast units	Pipes, panels, poles
RMC	Ready-made at plant	Mass construction
High-Strength	> 40 MPa strength	Tall buildings
HPC	Enhanced performance	Nuclear, marine works
SCC	Self-flowing	Dense rebar zones
FRC	Fibre enhanced	Runways, pavements
Lightweight	Low density	Roofing, insulation
Air-Entrained	Freeze-thaw resistant	Road pavements
Pervious	Water permeable	Eco-parks, sidewalks
Vacuum	Dewatered concrete	Industrial floors
Shotcrete	Sprayed on surfaces	Tunnels, retaining walls
Polymer	Uses polymers as binder	Chemical industries

📝 Conclusion

Understanding the various types of concrete is essential for both theoretical and practical knowledge in civil engineering. JKSSB examiners often ask direct and application-based questions on this topic. Make sure to revise composition, application, and advantages of each type.