IRC Code: SP:63-2018 – Comprehensive Guidelines for Interlocking Concrete Block Pavements

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The Indian Roads Congress (IRC) published the updated guidelines, IRC:SP:63-2018, for the design and construction of Interlocking Concrete Block Pavement (ICBP). These pavements have become a reliable and efficient solution for low and medium-volume roads, offering durability and cost efficiency. The code outlines comprehensive recommendations for block types, applications, construction techniques, and maintenance strategies.

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Scope of IRC:SP:63-2018

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This code is specifically meant for designing and constructing Interlocking Concrete Block Pavements on roads that do not fall under high-speed traffic categories, such as Expressways and National Highways. It covers the applications, design guidelines, and maintenance practices for various road types, including city streets, toll plazas, and high-altitude roads.

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Applications of Interlocking Concrete Block Pavements

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The guidelines highlight several key applications, including:

• Footpaths and Cycle Tracks: Ensuring safe and smooth movement for pedestrians and cyclists.
• City Streets and Parking Areas: Ideal for areas with moderate traffic.
• Toll Plazas and Highway Rest Areas: Providing durability under consistent vehicle loads.
• Container Depots and Port Roads: Withstanding heavy loads and vehicular turning stresses.

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Advantages of Interlocking Concrete Block Pavements

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1. Durability: Highly resistant to vehicle-induced stress and environmental changes.
2. Skid Resistance: Ensures better traction due to its rough surface.
3. Ease of Repairs: Blocks can be easily removed and replaced, making maintenance convenient.
4. Lower Maintenance Costs: Compared to traditional bituminous pavements.
5. Quick Construction: Requires no in-situ curing, allowing immediate traffic usage.

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Construction Guidelines

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The construction process as per IRC:SP:63-2018 involves several steps:

1. Subgrade Preparation: The foundation layer should be well compacted and leveled.
2. Base and Sub-Base Construction: Granular or cement-bound base layers are recommended for heavy traffic roads.
3. Bedding Sand Placement: A 30 mm layer of bedding sand provides a cushioning effect.
4. Block Installation: Blocks are laid manually or mechanically in patterns such as stretcher bond or herringbone bond.
5. Joint Filling: Sand is broomed into the joints to provide stability and interlocking strength.

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Maintenance Practices

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Regular maintenance ensures the longevity of block pavements. Key activities include:

• Initial Sand Filling: Filling joints with sand after the first few weeks of traffic usage.
• Block Replacement: Damaged blocks should be promptly replaced.
• Weed Control: Manual removal or herbicide application may be required.

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Conclusion

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The IRC:SP:63-2018 guidelines provide essential insights for the design and construction of durable, cost-effective, and environmentally friendly interlocking concrete block pavements. Adhering to these guidelines ensures safer, long-lasting roads with minimal maintenance.

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