3. Aggregates for Concrete
Aggregates constitute a significant portion of concrete, influencing its properties such as workability, strength, and durability. Their classification is based on size, origin, shape, and density, affecting their performance in concrete mixes. Understanding the properties, grading, and testing methods of aggregates is crucial for ensuring the quality of concrete.
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What we have learnt
- Aggregates make up 60-75% of concrete volume, significantly impacting its characteristics.
- Proper classification and grading of aggregates enhance strength, workability, and durability.
- Testing aggregates is essential to ensure compliance with standards and quality in concrete.
Key Concepts
- -- Fine Aggregates
- Aggregates with a size less than 4.75 mm, used to fill voids between coarse aggregates.
- -- Coarse Aggregates
- Aggregates larger than 4.75 mm, providing strength and dimensional stability to concrete.
- -- Grading
- The process of determining the particle size distribution of aggregates, crucial for optimizing concrete mixes.
- -- AlkaliAggregate Reaction (AAR)
- A chemical reaction between reactive aggregates and alkalis in cement, leading to expansion and potential structural damage.
- -- Recycled Aggregates
- Aggregates sourced from reclaimed concrete, contributing to sustainability in construction practices.
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