Self Compacting Concrete: The Future of Ready Mix Concrete

Self Compacting Concrete: The Future of Ready Mix Concrete

Ready Mix Concrete (RMC) and Self-Compacting Concrete (SCC) are two modern concrete technologies widely used in today’s construction industry.

In this video, you will learn:
✔ What is Ready Mix Concrete (RMC)
✔ What is Self-Compacting Concrete (SCC)
✔ Differences between RMC and SCC
✔ Advantages and applications of both concretes
✔ Which concrete is best for modern construction

This video is extremely useful for civil engineering students, diploma & B.Tech learners, site engineers, and construction professionals.

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SELF COMPACTING CONCRETE (SCC)

Definition
Self Compacting Concrete is a high-performance concrete that flows under its own weight, fills the formwork completely, and passes through congested reinforcement without the need for vibration.

Objectives of SCC
• Eliminate mechanical vibration
• Ensure proper compaction
• Improve surface finish
• Reduce labour, noise, and construction time

Properties of SCC
SCC must satisfy three important fresh concrete properties:
1. Filling Ability – Ability to flow and fill the formwork
2. Passing Ability – Ability to pass through reinforcement without blocking
3. Resistance to Segregation – Ability to remain homogeneous during flow

Materials Used in SCC
• Cement
• Fine aggregate (used in higher proportion)
• Coarse aggregate (generally limited size, usually up to 20 mm)
• Mineral admixtures such as fly ash, GGBS, silica fume
• Superplasticizers (high range water reducers)
• Viscosity Modifying Agents

Tests for SCC
Slump Flow Test – Filling ability
V-Funnel Test – Flow time and viscosity
L-Box Test – Passing ability
U-Box Test – Flow restriction
J-Ring Test – Passing ability with reinforcement

Advantages of SCC
• No vibration required
• Excellent compaction even in congested reinforcement
• Better durability and strength
• Superior surface finish
• Faster construction

Disadvantages of SCC
• Higher initial cost
• Sensitive to mix proportioning
• Requires strict quality control

Applications of SCC
• Heavily reinforced structures
• High-rise buildings
• Precast concrete elements
• Complex formwork
• Repair and rehabilitation works

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READY MIX CONCRETE (RMC)

Definition
Ready Mix Concrete is concrete manufactured in a batching plant as per a designed mix and delivered to the construction site in fresh condition using transit mixers.

Components of RMC
• Cement
• Fine aggregate
• Coarse aggregate
• Water
• Admixtures such as plasticizers, retarders, accelerators

Types of Ready Mix Concrete Plants
1. Central Mixing Plant – Mixing is done completely at the plant
2. Transit Mixing Plant – Mixing is done during transportation
3. Shrink Mixing Plant – Partial mixing at plant and remaining in transit

Advantages of RMC
• Consistent quality and strength
• Faster construction
• Reduced material wastage
• Less site storage required
• Environment friendly

Disadvantages of RMC
• Higher initial cost
• Limited setting time
• Delay in transportation affects quality
• Not suitable for very remote locations

Grades of Ready Mix Concrete
• M10 and M15 – Plain concrete
• M20 to M40 – Reinforced cement concrete
• M45 and above – High strength concrete

Applications of RMC
• Residential and commercial buildings
• Roads and pavements
• Bridges and flyovers
• Mass concreting works
• Infrastructure projects

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Difference Between SCC and RMC

Compaction
SCC – Self compacting, no vibration required
RMC – Requires vibration

Production
SCC – Special mix design
RMC – Plant batched concrete

Labour Requirement
SCC – Very low
RMC – Moderate

Cost
SCC – Higher
RMC – Economical

Usage
SCC – Complex and heavily reinforced works
RMC – General construction