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IRC SP 75 : 2008

Guidelines for Design and Construction of Concrete Roads Using Roller Compacted Concrete

AASHTO Guide for Design of Pavement Structures (for general pavement design principles) · ACI 325.1R-13 Guide to Materials and Construction of Roller-Compacted Concrete Pavements (USA) · BS EN 1992-1-1 Eurocode 2: Design of concrete structures (general concrete design principles)
CurrentFrequently UsedCode of PracticeTransportation · Roads and Pavement
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Summary

This IRC code outlines the principles and practices for designing and constructing Roller Compacted Concrete (RCC) pavements. It details the selection and proportioning of materials to achieve the required strength and durability, emphasizing the role of aggregate gradation and cementitious binder content. The code specifies construction methods, including placement, compaction, and jointing techniques, highlighting the importance of achieving adequate density and surface finish. Quality control measures for both materials and construction are elaborated, along with recommendations for inspection and testing. Finally, it addresses maintenance aspects and repair strategies to ensure the long-term performance of RCC pavements.

This IRC code provides comprehensive guidelines for the design and construction of pavements utilizing Roller Compacted Concrete (RCC). It covers the material properties, mix design considerations, construction procedures, quality control measures, and maintenance aspects specific to RCC pavements. The document aims to promote the use of RCC as a durable and cost-effective paving solution for various traffic applications.

Key Values
minimum flexural strength 28 days3.5 MPa (for light traffic)
minimum flexural strength 28 days heavy traffic4.5 MPa
minimum compressive strength 28 days25 MPa
Practical Notes
! Ensure uniform moisture content in aggregates before batching for consistent mix properties.
! Properly calibrate batching plants to ensure accurate proportioning of all ingredients.
! Adequate compaction is critical for RCC. Use vibratory rollers with sufficient weight and frequency.
! Avoid segregation during placement by ensuring a continuous and controlled flow of RCC.
! Joints are essential for controlling cracking. Plan and construct them accurately and promptly.
! Curing is vital to achieve desired strength and durability. Protect the surface from rapid drying.
! Regularly inspect and maintain compaction equipment to ensure optimal performance.
! The use of admixtures, such as water reducers, can be beneficial for improved workability and strength, even in zero-slump mixes.
! Consider the ambient temperature and humidity during construction as they can significantly impact setting time and curing.
! Train personnel involved in RCC paving on the specific techniques and quality control measures.
! Thorough subgrade preparation and compaction are fundamental for the long-term performance of any pavement, including RCC.
! The selection of appropriate cementitious material content is crucial to balance strength, durability, and cost-effectiveness.
! Implement a robust quality assurance program, including regular sampling and testing of fresh and hardened RCC.
! Plan for pavement drainage to prevent water infiltration, which can degrade the pavement structure.
! Consider the use of joint sealing compounds to prevent ingress of water and incompressible materials into the joints.
! The choice of aggregate type and gradation significantly impacts the workability and strength of RCC.
Roller Compacted ConcreteRCCConcrete PavementsHighway EngineeringPavement DesignPavement ConstructionQuality ControlConstruction MaterialsRoad ConstructionIndustrial PavementsZero Slump ConcreteIRC
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Similar International Standards
AASHTO Guide for Design of Pavement Structures (for general pavement design principles)
MediumCurrent
ACI 325.1R-13 Guide to Materials and Construction of Roller-Compacted Concrete Pavements (USA)
MediumCurrent
BS EN 1992-1-1 Eurocode 2: Design of concrete structures (general concrete design principles)
MediumCurrent
Key Differences
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Key Similarities
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Parameter Comparison
ParameterIS ValueInternationalSource
Minimum Flexural Strength (Heavy Traffic)
Minimum Compressive Strength (28 days)
Target Density
Maximum Slump
Supplementary Cementitious Materials (Fly Ash/GGBS)
⚠ Verify details from original standards before use
Quick Reference Values
minimum flexural strength 28 days3.5 MPa (for light traffic)
minimum flexural strength 28 days heavy traffic4.5 MPa
minimum compressive strength 28 days25 MPa
maximum slump0 mm (designed for zero slump)
target density95-98% of theoretical maximum density
minimum cement content300 kg/m³
minimum fly ash content replacement15% by weight of cementitious material
minimum ground granulated blast furnace slag content replacement30% by weight of cementitious material
maximum aggregate sizeTypically 20 mm or 37.5 mm depending on layer thickness
joint spacing longitudinalTypically 3-5 meters
joint spacing transverseTypically 5-10 meters
minimum layer thickness150 mm
minimum subgrade support cbr5%
compaction effortTo achieve target density
curing periodMinimum 7 days
traffic lane width3.5 meters
shoulder width2.0 meters
minimum thickness for heavy traffic200 mm
Key Formulas
V_w = (W_w * G_w) / γ_w + V_a + V_c + V_s + V_fa + V_ad
Modulus of Rupture (MOR) = (3 * P * L) / (2 * b * d²)
Compressive Strength = Failure Load / Area of Specimen
Density = Mass / Volume
Key Tables
Gradation Requirements for Coarse Aggregate
Properties of Cementitious Materials
Recommended Mix Proportions for RCC (Illustrative)
Compaction Equipment Specifications
Typical Paving Speeds and Compaction Passes
Minimum Flexural Strength Requirements for Different Traffic Categories
Key Clauses
Definitions and Abbreviations
Materials
Mix Design
Construction
Quality Control and Assurance
Pavement Design
Maintenance and Repair
Environmental Considerations
What is Roller Compacted Concrete (RCC)?+
Roller Compacted Concrete (RCC) is a zero-slump concrete mix that is transported, placed, and compacted using conventional asphalt paving equipment and vibratory rollers. It is designed to be dense and strong, offering a durable and cost-effective paving solution. The key difference from conventional concrete is its very low water-binder ratio, which eliminates the need for formwork in many applications and allows for rapid construction.
What are the advantages of using RCC pavements?+
RCC pavements offer several advantages, including rapid construction, lower material costs compared to conventional concrete, high load-bearing capacity, excellent durability, and reduced maintenance requirements. Its ability to be paved with asphalt equipment makes it attractive for projects where traditional concrete paving might be slower or more expensive. The dense nature of RCC also makes it resistant to rutting and deformation under heavy traffic loads.
What is the typical thickness of an RCC pavement layer?+
The minimum thickness for an RCC pavement layer is generally 150 mm. However, for pavements subjected to heavier traffic loads or in areas with weaker subgrades, thicker layers, such as 200 mm or more, might be specified. The actual thickness determination is part of the pavement design process outlined in the code, considering factors like traffic volume, axle loads, and subgrade CBR.
What is the role of fly ash and GGBS in RCC?+
Fly ash and Ground Granulated Blast Furnace Slag (GGBS) are commonly used as supplementary cementitious materials in RCC. They contribute to improved workability, enhanced long-term strength, increased durability, and reduced heat of hydration. Replacing a portion of Portland cement with these materials can also lead to cost savings and environmental benefits, as they are industrial by-products.
How is RCC compacted?+
RCC is compacted using heavy-duty vibratory rollers, similar to those used for asphalt paving. The key is to achieve a high degree of density, typically 95-98% of the theoretical maximum density. The number of passes and the type of roller are crucial parameters to ensure adequate compaction without causing segregation or damage to the pavement.
What are the design considerations for RCC pavements?+
The design of RCC pavements involves determining the required flexural strength based on traffic loads, selecting appropriate layer thicknesses, and ensuring adequate subgrade support. The code provides guidelines for calculating the structural capacity of RCC pavements, considering factors like fatigue resistance and load transfer at joints. The subgrade's California Bearing Ratio (CBR) is a critical input for pavement thickness design.
What is the importance of joints in RCC pavements?+
Joints in RCC pavements are essential for controlling shrinkage and temperature-induced cracking. Transverse joints are typically constructed at regular intervals to allow for expansion and contraction of the pavement slab, preventing uncontrolled cracking. Longitudinal joints are used to separate lanes or tie adjacent slabs. Proper joint design, spacing, and sealing are critical for pavement performance and longevity.
What quality control measures are recommended for RCC construction?+
Quality control for RCC construction involves regular testing of materials (cement, aggregates, fly ash, GGBS), mix design verification, monitoring of batching and mixing operations, field density tests, and flexural strength tests on pavement cores or beams. The code emphasizes a robust quality assurance program to ensure the pavement meets the specified performance criteria and durability requirements.
Can RCC be used for heavy industrial applications or port areas?+
Yes, RCC is particularly well-suited for heavy industrial applications, port areas, container yards, and other areas subjected to extreme static and dynamic loads. Its high strength, durability, and resistance to abrasion and chemical attack make it an ideal choice for such demanding environments. The design in these applications often requires higher strength RCC mixes and thicker pavement layers.
What is the typical curing period for RCC pavements?+
The curing period for RCC pavements is typically a minimum of 7 days. However, in drier or hotter climates, a longer curing period may be necessary to ensure adequate hydration and strength development. Proper curing methods, such as water curing or the application of curing compounds, are essential to prevent premature drying and cracking of the surface, thereby enhancing durability.