7. Properties and Testing of Aggregates
Aggregates are essential in road construction, comprising a large percentage of concrete pavements, significantly impacting strength and durability. The chapter discusses the classification of aggregates, their desirable properties, and standardized testing methods to evaluate their suitability for various pavements. Understanding these aspects is key to ensuring the longevity and performance of road infrastructure.
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What we have learnt
- Aggregates are primarily classified by source, size, and shape.
- The desirable properties of aggregates include strength, hardness, toughness, and durability.
- Standard tests are essential for assessing the quality and suitability of aggregates in construction.
Key Concepts
- -- Natural Aggregates
- Aggregates sourced from nature such as sand, gravel, and crushed stone.
- -- Standardized Testing
- Established methods to evaluate the properties of aggregates ensure quality and compliance.
- -- Specific Gravity
- The ratio of the density of the aggregate to the density of water, influencing mix density and strength.
- -- Flakiness Index
- A measure of the percentage of flaky particles in aggregate that affects workability.
- -- AlkaliAggregate Reactivity
- The potential chemical reaction between alkalis in cement and aggregates, leading to expansion and cracking.
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