IRC:15-2017: Code of Practice for Construction of Jointed Plain Concrete Pavements

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The Standard Specification and Code of Practice for Construction of Concrete Roads was first published in July 1965 and has undergone several revisions, with the latest edition being published in 2017. This document addresses advancements in technology and construction practices for concrete roads, including the use of new materials and techniques. The need for this updated code arose from the evolving requirements in road construction, such as widening existing roads and addressing issues related to the durability and performance of concrete pavements.

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Scope

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The Code of Practice aims to standardize the construction of jointed plain concrete pavements. It covers various aspects, including:

• Materials
• Equipment
• Mixing
• Curing

The code incorporates relevant provisions from various IRC codes to ensure comprehensive guidance for engineers and contractors involved in road construction.

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Materials

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1. Cement

Cement types suitable for use include:

• Ordinary Portland Cement (OPC)
• Portland-Pozzolana Cement (PPC)
• Sulphate Resisting Portland Cement

The minimum compressive strength of the cement should not be less than 43 MPa.

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2. Admixtures

Chemical Admixtures

Admixtures conforming to IS:9103 may be used to enhance workability and setting time. Air-entraining admixtures are recommended for freezing conditions.

Mineral Admixtures

Materials such as fly ash, ground granulated blast furnace slag, and silica fume can be added to improve concrete properties.

3. Aggregates

Aggregates must comply with IS:383, be free from deleterious materials, and meet specific grading requirements.

4. Water

Water used for mixing and curing must be clean and free from harmful substances.

5. Steel Dowel Bars and Tie Bars

These should conform to IS:432 and IS:1786, with appropriate anti-corrosive coatings.

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Proportioning of Concrete

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Concrete mix design should follow IRC:44, ensuring the minimum flexural strength is achieved. The minimum cement content is specified, and adjustments may be made based on the use of mineral admixtures.

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Tools, Plants & Equipment

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A comprehensive list of necessary tools and equipment is provided, emphasizing the importance of mechanized construction for efficiency and quality. This includes batching plants, mixers, and pavers.

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Preparation of Subgrade, Sub-Base, and Laying of Separation Membrane

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Proper preparation of the subgrade and sub-base is crucial for pavement performance. Capillary cut-offs may be used to mitigate water migration issues.

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Weather Limitations

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Guidelines for concreting in hot and cold weather are provided, emphasizing the need for precautions to prevent damage to the concrete.

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Joints

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Different types of joints (expansion, contraction, longitudinal, and construction) are discussed, along with their specifications and sealing requirements. Proper joint construction is essential to prevent cracking and ensure the longevity of the pavement.

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Storage and Handling of Materials

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Proper storage and handling practices for cement and aggregates are outlined to ensure material quality. This includes guidelines for preventing contamination and maintaining the integrity of the materials.

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Construction

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Fully Mechanized Construction

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Details on the use of batching plants, mixers, and pavers are provided, emphasizing the importance of continuous operation and quality control. Mechanized construction is recommended for achieving high-quality pavements.

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Semi-Mechanized Construction Technique

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Guidelines for semi-mechanized construction methods are discussed, including the use of fixed forms and manual tools. This approach may be necessary in areas where mechanized equipment cannot be used.

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Trial Length

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Trial lengths must be constructed to assess the effectiveness of materials and methods before full-scale construction begins. This allows for adjustments to be made based on real-world performance.

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Quality Control

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A comprehensive quality control plan is outlined, including testing frequencies and acceptance criteria for various aspects of the construction process. Regular testing ensures that the pavement meets the required standards for strength and durability.

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Opening to Traffic

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Traffic should not be allowed on newly constructed pavements for a minimum of 28 days to ensure adequate curing and strength development. Proper curing is essential for the longevity of the pavement.

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Conclusion

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The IRC:15-2017 Code of Practice for Construction of Jointed Plain Concrete Pavements serves as a vital resource for engineers, contractors, and stakeholders involved in the construction of concrete roads. By providing comprehensive guidelines on materials, construction techniques, quality control, and maintenance practices, this code aims to ensure the durability, safety, and efficiency of concrete pavements.

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Adhering to the standards outlined in this document not only promotes uniformity in construction practices but also addresses the challenges posed by varying environmental conditions and traffic loads. The emphasis on quality control, including rigorous testing and evaluation, ensures that the pavements meet the required performance criteria, ultimately leading to safer and more reliable roadways.

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As the demand for efficient and sustainable infrastructure continues to grow, the principles and practices established in this code will play a crucial role in shaping the future of road construction. By following these guidelines, the construction industry can contribute to the development of resilient and long-lasting concrete pavements that meet the needs of modern transportation systems.

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