Classification of Aggregates
Key Concepts
Definition of Aggregates
- Aggregates comprise sand, gravel, crushed stone, and recycled concrete.
- They are used in construction to provide bulk, strength, and wear resistance.
Types of Aggregates
- Natural Aggregates:
- Derived from natural sources like riverbeds, quarries, and pits.
- Examples: Sand, gravel.
- Processed Aggregates:
- Manufactured from natural stone or by recycling materials.
- Examples: Crushed stone, recycled concrete.
- Natural Aggregates:
Classification Criteria
- Size:
- Fine Aggregates: Particles smaller than 4.75 mm.
- Coarse Aggregates: Particles larger than 4.75 mm.
- Source:
- Natural Aggregates: Directly obtained from the environment.
- Artificial Aggregates: Produced using by-products or synthetic materials.
- Density:
- Lightweight Aggregates: Density less than 1120 kg/m³.
- Normal Weight Aggregates: Density between 1520-1680 kg/m³.
- Heavyweight Aggregates: Density greater than 2080 kg/m³.
- Shape:
- Rounded, angular, flaky, and elongated.
- Size:
Properties
- Physical: Affect durability and stability of the structure.
- Examples include shape, size, texture, and volume.
- Mechanical: Influence the strength and load-bearing capacity.
- Strength, abrasion resistance.
- Chemical: Determine compatibility with cement and effects on concrete.
- Reactivity, impurities.
- Physical: Affect durability and stability of the structure.
Uses in Construction
- Concrete Production: Essential for forming concrete mixes.
- Road Construction: Used as base material for pavements.
- Landscaping: Decorative aggregates for aesthetic purposes.
- Drainage Systems: Used to create permeable layers for water filtration.
Environmental Considerations
- Recycling aggregates help in reducing environmental impact.
- Sustainable sourcing practices are important for preserving natural resources.
These points provide a comprehensive summary of the primary concepts related to the classification of aggregates, based on the provided text.
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