Introduction

Ready Mix Concrete (RMC) is a pre-mixed, high-quality concrete manufactured in batching plants and delivered to construction sites in transit mixers. It ensures precision, durability, and efficiency in modern construction, eliminating the need for on-site mixing.

What is Ready Mix Concrete (RMC)?

Ready Mix Concrete (RMC) is a factory-made concrete mixture where cement, aggregates, water, and admixtures are precisely proportioned and mixed before transportation. It is delivered in a plastic, ready-to-use state, ensuring consistency and strength.

Unlike traditional site-mixed concrete, RMC reduces labor, waste, and inconsistencies, making it ideal for large-scale projects like:

• High-rise buildings
• Bridges & highways
• Industrial floors
• Precast concrete structures

For a deeper dive, check this guide on ready mix concrete.

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Difference Between Concrete and Ready Mix Concrete

Feature	Traditional Concrete	Ready Mix Concrete (RMC)
Mixing Location	Mixed on-site	Pre-mixed in a plant
Quality Control	Variable, depends on labor	Consistent, lab-tested
Wastage	Higher due to manual errors	Minimal, precise batching
Time Efficiency	Slower due to manual mixing	Faster, ready to pour
Best For	Small-scale projects	Large, time-sensitive projects

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Dry Mix vs. Ready Mix Concrete

• Dry Mix Concrete:
  • Ingredients (cement, sand, aggregates) are pre-mixed dry and water is added later.
  • Used in small repairs, bagged concrete products.
  • Less consistent than RMC.
• Ready Mix Concrete:
  • Fully mixed with water before delivery.
  • Ensures homogeneity and strength.
  • Preferred for large-scale construction.

Learn more about types and advantages of RMC.

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Which Cement is Used in RMC?

Most RMC plants use:

• Ordinary Portland Cement (OPC 43 & 53 Grade) – General construction
• Portland Pozzolana Cement (PPC) – Better durability, lower heat
• Sulfate-Resistant Cement (SRC) – Marine/chemical environments

The choice depends on strength requirements and environmental conditions.

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How to Calculate RMC Concrete?

To estimate RMC needed:

1. Volume Calculation (for slabs, beams, columns):Volume=Length×Width×ThicknessVolume=Length×Width×ThicknessExample: A 100 sq ft slab (4-inch thick) needs:100×412=33.33 cubic feet (≈1.2 m3)100×124​=33.33cubic feet(≈1.2m3)
2. Order 10-15% extra to account for spills and uneven surfaces.

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Which Chemicals are Used in RMC?

Common admixtures in RMC:

• Plasticizers (Improve workability)
• Superplasticizers (Reduce water content)
• Accelerators (Speed up setting time)
• Retarders (Delay hardening in hot weather)
• Air-entraining agents (Freeze-thaw resistance)

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What is M25 in RMC?

M25 is a concrete grade where:

• “M” stands for Mix
• “25” indicates 25 MPa compressive strength after 28 days.

Mix Ratio (Cement:Sand:Aggregate):

• 1:1:2 (with appropriate water-cement ratio)

Used in:

• Residential slabs
• Medium-load structures

For more details, see this resource on ready-mixed concrete.

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How Much is 1m³ of Ready Mix Concrete?

Cost varies by region and project specs:

Region	Approx. Cost per m³ (USD)
USA	120−120−150
UK	£90 – £120
India	₹4,000 – ₹5,500

Factors affecting price:

• Cement grade
• Admixtures used
• Delivery distance

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What is the Ratio of RMC?

Common RMC mix ratios:

Grade	Ratio (Cement:Sand:Aggregate)
M10	1:3:6
M15	1:2:4
M20	1:1.5:3
M25	1:1:2

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Process of Ready Mix Concrete Production

1. Batching – Weighing raw materials (cement, aggregates, water).
2. Mixing – Uniform blending in automated plants.
3. Transporting – Delivered via transit mixers (kept rotating).
4. Placing – Poured directly at the site.
5. Curing – Maintained for optimal strength.

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How Much RMC is Needed for 1000 sq ft?

Assuming 4-inch thick slab:1000×412=333.33 cubic feet (≈9.44 m3)1000×124​=333.33cubic feet(≈9.44m3)

Order ~10.5 m³ (including wastage).

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Density of RMC

• Standard RMC density: 2400 kg/m³ (varies with mix design).
• Lightweight RMC: 1800 kg/m³ (with expanded clay/shale).

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Which Cement is Best for Slab Construction?

• OPC 53 Grade (High early strength)
• PPC (Better long-term durability)

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Raw Materials for RMC

• Cement
• Fine aggregates (sand)
• Coarse aggregates (gravel, crushed stone)
• Water
• Chemical admixtures

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Conclusion

Ready Mix Concrete offers precision, speed, and quality, making it the preferred choice for modern construction. Whether for M25-grade slabs or large industrial projects, RMC ensures strength, consistency, and cost-efficiency.

For further reading, explore:

• Ready Mix Concrete Guide
• Types of Ready-Mixed Concrete

Got questions? Let us know in the comments! 🚀