6. Road Aggregates – Requirements and Types
Road aggregates are essential components in construction, comprising up to 90% in cement concrete pavements. They influence the strength, durability, and overall performance of pavements, making their properties and types critical for effective road construction. The chapter delves into the requirements, classifications, and testing of different types of aggregates to ensure optimal performance.
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What we have learnt
- Aggregates are crucial for the performance and durability of road pavements.
- The suitability of aggregates depends on their strength, toughness, and shape among other properties.
- Different types of aggregates include natural, artificial, and recycled, each with specific applications.
Key Concepts
- -- Strength
- The ability of aggregate particles to resist crushing under heavy traffic loads.
- -- Durability
- Resistance to weathering under conditions like freeze-thaw and wetting-drying cycles.
- -- Gradation
- The distribution of particle sizes within an aggregate sample, affecting compaction and stability.
- -- Specific Gravity
- A measure of the density of the aggregates, typically ranging between 2.5 to 3.0.
- -- Flakiness Index
- A measure of the shape of aggregates, where a lower value indicates better performance in surfaces.
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